Public Comment No. 73-NFPA 79-2016 [ Section No. 1.1.1 ... · Public Comment No. 73-NFPA 79-2016 [ Section No. 1.1.1 ] 1.1.1 The provisions of this standard shall apply to the electrical/electronic

Public Comment No. 73-NFPA 79-2016 [ Section No. 1.1.1 ]

1.1.1

The provisions of this standard shall apply to the electrical/electronic equipment, apparatus, or systems of industrial machines operating supplied from a nominal voltage of 1000 volts or less, and commencing at the point of connection of the supply circuit conductors to the electrical equipment of the machine.

Statement of Problem and Substantiation for Public Comment

This comment is an output of the 1000V NFPA79 Task Group. The proposed change clarifies the voltage requirement is in regards to the supply voltage. The task group did note that it is unclear if the 1000V limit applies both AC and DC as the scope of IEC 60204-1 addresses equipment up to 1000V AC and 1500V DC. Related Item First Revision No. 3-NFPA 79-2016 [Section No. 1.1.1]

Submitter Information Verification

Submitter Full Name: Jay Tamblingson

Organization: Rockwell Automation

Street Address:

City:

State:

Zip:

Submittal Date: Thu Nov 17 15:30:34 EST 2016

Committee Statement

Committee Action:

Rejected but see related SR

Resolution: SR-9-NFPA 79-2017

Statement: The Technical Committee replaced "operating" with "supplied" which clarifies the voltage requirement is in regards to the supply voltage not the operating voltage.

Public Comment No. 87-NFPA 79-2016 [ New Section after 1.6 ]

1.7 Installation and Use

Listed or Labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.


All equipment needs to be installed and used according to the manufacturer's instructions if listed. NFPA 79 should not rely on 1.5 to refer users to NEC 110.3(B). Related Item First Revision No. 60-NFPA 79-2016 [Section No. 7.2.10.4]


Submitter Full Name: Paul Dobrowsky

Organization: Innovative Technology Services

Street Address:

City:

State:

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Committee Statement

Committee Action:



Statement: The TC adds this requirement to clarify that listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing and labeling. NFPA 79 should not rely on 1.5 to refer users to NEC 110.3(B). This is re-located to Chapter 4 in the new location as a new section after 4.2 as 4.3 as it is more appropriate under the general requirements as opposed to administration in Chapter 1.


3.3.11* Basic Protection (Protection From Direct Contact) .

Protection against electric shock under fault-free conditions.


Delete the parenthetical term here and in Annex A. The term direct contact will not be defined or used in the 2018 NFPA 79 so should not be included as a parenthetical note. Previously parenthetical notes were used as an attempt to describe IEC terms and those were removed due to the confusion created. TG2 Luis Bas - Chair; Paul Dobrowsky; Brett Imlah; Daleep Mohla; Dino Mariuz; Richard Trainor Related Item Public Input No. 144-NFPA 79-2016 [Section No. 3.3.91]


Submitter Full Name: Luis Bas

Organization: Intertek Testing Services

Affilliation: TG2

Street Address:

City:

State:

Zip:


Committee Statement

Committee Action:



Statement: The TC removes the parenthetical term "Protection From Direct Contact" because this is explained in the Annex note. The TC gave further consideration to the ballot comments during voting in FR 20. NFPA 70E primarily addresses work practices where NFPA 79 primarily applies to the design and installation of equipment of industrial machinery. There are no similar or equivalent terms in 70E that address this.


3.3.11* Basic Protection (Protection From Direct Contact).

Protection against electric shock under fault-free conditions.

Additional Proposed Changes

File Name Description Approved CN_5.pdf 79_CCNote5


This Public Comment appeared as CC Note No. 5 in the First Draft Report on First Revision No. 20, and is also related to Public Input No. 105 and Public Input No. 104. The Correlating Committee directs the committee to give further consideration to the comments expressed in voting on FR 20, relative to considering the use of definitions consistent with those in NFPA 70E. This action will be considered as a public comment. Related Item First Revision No. 20-NFPA 79-2016 [New Section after 3.3.8]

Public Input No. 104-NFPA 79-2016 [New Section after 3.3.8]

Public Input No. 105-NFPA 79-2016 [New Section after A.3.3.8]


Correlating Committee Note No. 5-NFPA 79-2016 [ New Section after 3.3.8 ]


Submitter Full Name: Patrick Foley

Organization: NFPA

Street Address:

City:

State:

Zip:

Submittal Date: Tue Jul 12 09:20:39 EDT 2016

Committee Statement and Meeting Notes

CommitteeStatement:

The Correlating Committee directs the committee to give further consideration to thecomments expressed in voting on FR 20, relative to considering the use of definitionsconsistent with those in NFPA 70E.

This action will be considered as a public comment.

Ballot Results

This item has passed ballot

12 Eligible Voters

1 Not Returned

11 Affirmative All

0 Affirmative with Comments

0 Negative with Comments

0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.

Deike, Jr., Roland E.

Hickman, Palmer L.

Hittinger, David L.

National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/FormLaunch?id=/TerraView/C...

1 of 2 11/9/2016 12:47 PM

Holub, Richard A.

Johnston, Michael J.

Kovacik, John R.

Manche, Alan

McCullough, Robert A.

Pierce, James F.

Saporita, Vincent J.


2 of 2 11/9/2016 12:47 PM

Submitter Full Name: CC on NEC-AAC

Organization: NFPA National Electrical Code® Correlating Committee

Street Address:

City:

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Submittal Date: Mon Nov 14 13:14:49 EST 2016

Committee Statement

Committee Action:



Statement: The TC removes the parenthetical term "Protection From Direct Contact" because this is explained in the Annex note. The TC gave further consideration to the ballot comments during voting in FR 20. NFPA 70E primarily addresses work practices where NFPA 79 primarily applies to the design and installation of equipment of industrial machinery. There are no similar or equivalent terms in 70E that address this.


3.3.46* Fault Protection (Protection From Indirect Contact).

Protection against electric shock under single-fault conditions.


Delete the parenthetical term here and in Annex A. The term direct contact will not be defined or used in the 2018 NFPA 79 so should not be included as a parenthetical note. Previously parenthetical notes were used as an attempt to describe IEC terms and those were removed due to the confusion created. TG2 Luis Bas - Chair; Paul Dobrowsky; Brett Imlah; Daleep Mohla; Dino Mariuz; Richard Trainor Related Item Public Input No. 144-NFPA 79-2016 [Section No. 3.3.91]




Affilliation: TG2

Street Address:

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Committee Statement

Committee Action:



Statement: The TC removes the parenthetical term "Protection from Indirect contact" because this is explained Annex J. The TC gave consideration to the ballot comments during the voting on FR 20. NFPA 70E primarily addresses work practices where NFPA 79 primarily applies to the design and installation of equipment of industrial machinery. There are no similar or equivalent terms in 70 E that address this.


3.3.46* Fault Protection (Protection From Indirect Contact).

Protection against electric shock under single-fault conditions.


File Name Description Approved CN_6.pdf 79_CC Note 6


NOTE: This Public Comment appeared as CC Note No. 6 in the First Draft Report on First Revision No. 22, and is also related to Public Input No. 103 and Public Input 106. The Correlating Committee directs the committee to give further consideration to the comments expressed in voting on FR 22, relative to considering the use of definitions consistent with those in NFPA 70E. This action will be considered as a public comment. Related Item First Revision No. 22-NFPA 79-2016 [New Section after 3.3.42]



Organization: NFPA National Electrical Code® Correlating Committee

Street Address:

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Organization: NFPA

Street Address:

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CommitteeStatement:

The Correlating Committee directs the committee to give further consideration to thecomments expressed in voting on FR 22, relative to considering the use of definitionsconsistent with those in NFPA 70E.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.


1 of 2 11/9/2016 12:51 PM

Holub, Richard A.


Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 12:51 PM

Submittal Date: Mon Nov 14 13:51:08 EST 2016

Committee Statement

Committee Action:



Statement: The TC removes the parenthetical term "Protection from Indirect contact" because this is explained Annex J. The TC gave consideration to the ballot comments during the voting on FR 20. NFPA 70E primarily addresses work practices where NFPA 79 primarily applies to the design and installation of equipment of industrial machinery. There are no similar or equivalent terms in 70 E that address this.

Public Comment No. 33-NFPA 79-2016 [ New Section after 3.3.69 ]

TITLE OF NEW CONTENT

“Machine Supply Circuit.” “The conductors between the premises wiring or onboard power supply and the machine disconnecting means or terminals.”


Add a new definition "Machine Supply Circuit." This definition is being added as a companion comment to Comment No. 31 and is intended to assist with clarifying what is the supply circuit to the machine.

Related Public Comments for This Document

Related Comment Relationship Public Comment No. 31-NFPA 79-2016 [Section No. 5.3.1.4]

Related Item First Revision No. 24-NFPA 79-2016 [Section No. 5.3]


Submitter Full Name: Mark Hilbert

Organization: MR Hilbert Electrical Inspecti

Street Address:

City:

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Zip:

Submittal Date: Wed Nov 16 21:12:09 EST 2016

Committee Statement

Committee Action:



Statement: Add a new definition “Machine Supply Circuit”. The definition is being added as a companion comment to comment number 31 and is intended to assist with clarifying what is the supply circuit to the machine. There is a need to differentiate between the requirements for the source(s) of supply for the machine and the downstream disconnects and enclosures. This is not new material based on ballot comments during voting.


3.3.96 Socket.

See 3.3.77, Receptacle.


Delete the term Socket and the note to see Receptacle The term "socket" should not be used in the body of the Standard and should not be included in Chapter 3 as s reference to see the term "receptacle". Annex J was added to help users understand the differences between terms used in other standards.


Related Comment Relationship Public Comment No. 48-NFPA 79-2016 [Section No. 3.3.96]

Related Item Public Input No. 144-NFPA 79-2016 [Section No. 3.3.91]




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Committee Statement

Committee Action:



Statement: The Committee removes the parenthetical terms (plug/socket), (plug/socket combination), (plugs)-(socket outlets), (socket-outlets) and (plug and socket outlets) from the body of the document. Additionally the Committee removes the definition of the term “socket” and the associate note from Chapter 3, the annex information in A.3.3.9 and A.3.3.82 and the symbols and descriptions related to “plug and socket” in Figure D.1q. Also Delete 3.3.9 "Attachment Plug (Plug Cap) (Plug)" and 3.3.82 "Receptacle." These actions are consistent with the actions taken in the 2015 cycle and during the First Draft to remove the parenthetical terms from the body of the document and provide correlation information in Annex J. See the actions taken in SR 1.


3.3.96 Socket.

See 3.3.77, Receptacle.


Delete the term Socket and the note to see Receptacle The term "socket" should not be used in the body of the Standard and should not be included in Chapter 3 as s reference to see the term "receptacle". Annex J was added to help users understand the differences between terms used in other standards. This might also be submitted by the TG on the term "socket" but also delete the term (including the entire parenthetical phrase) in the following sections (based on 2015 NFPA 79) : 5.3.2(6) 5.3.3.2 5.3.3.2(1) twice 5.3.5.1(2) 6.4.2(5) 6.4.2(5)(a) 6.4.2(5)(b) 11.2.1.8 13.1.2.1 13.4.5 13.4.5.1 twice 13.4.5.2 13.4.5.3 13.4.5.4 13.4.5.5 13.4.5.6 13.4.5.7 13.4.6 three times 15.1.1(4) A.3.3.8 delete everything including the * in Chapter 3 A.3.3.77 delete everything including the * in Chapter 3 A.11.2.1.7 A.13.1.2.1 FIGURE D.1(q) delete "and socket" Index on pg 97 & 98


Related Comment Relationship Public Comment No. 45-NFPA 79-2016 [Section No. 3.3.96]

Related Item Public Input No. 144-NFPA 79-2016 [Section No. 3.3.91]




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3.3.106 Tight (suffix).

So constructed that the specified material is excluded under specified conditions.


File Name Description Approved CN_8.pdf NFPA 79 CC Note # 8


NOTE: This Public Comment appeared as CC Note No. 8 in the First Draft Report on First Revision No. 10. This action will be considered as a public comment Related Item First Revision No. 10-NFPA 79-2016 [New Section after 3.3.106]



Organization: NFPA CC on NEC-AAC

Street Address:

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Submittal Date: Tue Nov 15 15:02:44 EST 2016

Committee Statement

Committee Action:






Organization: NFPA

Street Address:

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CommitteeStatement:

The Correlating Committee directs the committee to give further consideration both tothe affirmative and negative comments expressed in voting on FR 10.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.


1 of 2 11/9/2016 12:53 PM


Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 12:53 PM

Statement: The definition was removed as it did not add clarity or usability to the document as not all possible situations that could occur were considered. When there is a visibility requirement within a section it must be judged based on the particular application. Using either “plainly” before “visible” or “clearly” before “visible” does not help with enforcing or interpreting a visibility requirement. Whether something is “visible” can only be judged on the specific application.


3.3.110 Visible, Plainly.

Able to be seen without the movement or unmounting of surrounding equipment.


The definition does not add clarity or usability to the document as it does not consider all situations that could occur. When there is a visibility requirement within a section it must be judged based on the particular application. Using either “plainly” before “visible” or “clearly” before “visible” does not help with enforcing or interpreting a visibility requirement. Whether something is “visible” can only be judged on the specific application. If there are different interpretations of the “visibility requirements” within a section, then the section should be rewritten to more clearly identify the visibility requirement. Additionally, the term “plainly” should be removed before “visible” throughout the Standard. Related Item First Revision No. 10-NFPA 79-2016 [New Section after 3.3.106]




Street Address:

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Committee Statement

Committee Action:



Statement: The definition was removed as it did not add clarity or usability to the document as not all possible situations that could occur were considered. When there is a visibility requirement within a section it must be judged based on the particular application. Using either “plainly” before “visible” or “clearly” before “visible” does not help with enforcing or interpreting a visibility requirement. Whether something is “visible” can only be judged on the specific application.

Public Comment No. 14-NFPA 79-2016 [ Section No. 4.3.2.8 ]

4.3.2.8 Circuits Supplied From Power Conversion Equipment.

Electrical conductors and equipment supplied by power conversion equipment as part of adjustable speed drive systems and servo drive systems shall be selected based on the electrical power characteristics involved and the equipment manufacturer’s instructions.




NOTE: This Public Comment appeared as CC Note No. 9 in the First Draft Report on First Revision No. 17. The Correlating Committee directs the committee to clarify the use of the word “involved” and consider deleting the word. This action shall be considered as a public comment. Related Item First Revision No. 17-NFPA 79-2016 [New Section after 4.3.2.7]



Organization: NFPA CC on NEC-AAV

Street Address:

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Committee Statement

Committee Action:



Statement: Listed flexible motor supply cable marked type RHH, RHW,RHW-2, XHH, XHHW or XHHW-2 will provide protection against damage which may occur in applications of variable frequency drives subjected to nonlinear power distortions. Use of these cables provides an alternate solution to following the equipment manufacturer’s instructions The reference to “electrical power characteristics involved” is deleted as it is vague and unenforceable (unclear to users of the standard). Deletion of this text addresses Public Comment No. 14, CC Note # 9.

Correlating Committee Note No. 9-NFPA 79-2016 [ New Section after 4.3.2.7 ]



Organization: NFPA

Street Address:

City:

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CommitteeStatement:

The Correlating Committee directs the committee to clarify the use of the word“involved” and consider deleting the word.

This action shall be considered as a public comment.

Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.


Kovacik, John R.


1 of 2 11/9/2016 12:54 PM

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 12:54 PM


4.3.2.8 Circuits Supplied From Power Conversion Equipment.

Electrical conductors and equipment supplied by power conversion equipment as part of adjustable speed drive systems and servo drive systems shall be either of type RHH, RHW, RHW-2, XHH, XHHW or XHHW-2 or selected based on the electrical power characteristics involved and the equipment manufacturer’s instructions.


File Name Description Approved

THHN_CIV_PITTING.jpg

THHN Tray cable was used between VFD and motor. Insulation shows pitting due to CIV caused by long cable run in moist environment. Cable run was 150 ft from Rockwell VFD to Motor. Application worked for 3 month and several cables started to fail. We caught this cable before it failed.


The current proposal aims to address the power abnormalities caused by PWM VFD’s. However, the current proposal does not prevent the use of THHN with inadequate dielectric strength for this power abnormality. Since every system is different the standard should not solely rely on the equipment manufacturer but rather identify the best general practice. Most VFD manufacturers provide very little instruction on the type of wiring material to be used. The most common recommendation is “use cable which is compliant with your local electrical code”. THHN wiring can be found in many VFD installations and is often even used in shielded Tray cable because the installer is trying to comply with NEC requirements in cable tray (Article 336), or simply uses THHN wires in conduit. There are alternatives with better insulation providing proper dielectric strength. These materials allow combined listings as type TC and type flexible motor supply cable or type flexible VFD and Servo cable. The addition of the thermoset conductors type RHH, RHW, RHW-2, XHH, XHHW or XHHW-2 is based on NEC table 310.15(B))16 and would encourage the use of them. These materials would also comply with UL subject 2277 "Outline of Investigation for Flexible Motor Supply Cable and Wind Turbine Tray Cable". By adopting this proposed edit, THHN could still be used, but only if it is within the manufacturer’s instructions. Problems with Thermoplastic insulation such as THHN: PVC/Nylon insulation (also referred to as THHN or THWN) is not a suitable solution for the following reasons: 1. It is thermoplastic material which allows deformation or might even melt at high temperatures caused by overload or short circuit. 2. It causes high cable charging current due to high capacitance resulting in more current to be required from the VFD to operate the motor 3. The dielectric strength of PVC is not strong enough to cope with the voltage spikes caused by the reflected wave phenomena. Some cable manufacturers include conductor stress relief layers before extruding the PVC in order to strengthen the Insulation, but this does not solve the issue of high capacitance and therefore high cable charging current in long lead length. 4. PVC loses part of its ability to insulate in wet environments. Moisture can reduce the voltage breakthrough resistance drastically (and immediately) allowing dangerous corona discharge leading to pitting of the insulation and eventually a short circuit. Related Item First Revision No. 17-NFPA 79-2016 [New Section after 4.3.2.7]


Submitter Full Name: Stefan Grunwald

Organization: Lutze Inc

Street Address:

City:

State:

Zip:

Submittal Date: Mon Sep 19 10:03:52 EDT 2016

Committee Statement

Committee Action:



Statement: Listed flexible motor supply cable marked type RHH, RHW,RHW-2, XHH, XHHW or XHHW-2 will provide protection against damage which may occur in applications of variable frequency drives subjected to nonlinear power distortions. Use of these cables provides an alternate solution to following the equipment manufacturer’s instructions The reference to “electrical power characteristics involved” is deleted as it is vague and unenforceable (unclear to users of the standard). Deletion of this text addresses Public Comment No. 14, CC Note # 9.


4.4.2* Electromagnetic Compatibility (EMC).

Transient suppression, isolation, or other appropriate means shall be provided where the equipment of an industrial machine generates electrical noise or transients, which can affect the operation of equipment.




NOTE: This Public Comment appeared as CC Note No. 10 in the First Draft Report on First Revision No. 14, and is also related to Public Input No. 155. The Correlating Committee directs the committee to clarify the text and give further consideration to the negative comments expressed in voting on FR 14. This action will be considered as a public comment. Related Item First Revision No. 14-NFPA 79-2016 [Section No. 4.4.2]

Public Input No. 155-NFPA 79-2016 [Section No. 4.4.2]


Correlating Committee Note No. 10-NFPA 79-2016 [ Section No. 4.4.2 ]



Organization: NFPA

Street Address:

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CommitteeStatement:

The Correlating Committee directs the committee to clarify the text and give furtherconsideration to the negative comments expressed in voting on FR 14.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.



1 of 2 11/9/2016 12:56 PM

Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 12:56 PM



Street Address:

City:

State:

Zip:


Committee Statement

Committee Action:



Statement: The committee statement for FR 14 indicates that: The effects on other equipment within the surrounding area must be considered but the machine is not required to have noise suppression for other such equipment. The TC has clarified the text and considered the negative comments as directed by the CC.



Transient suppression, isolation, or other appropriate means shall be provided where the equipment of an industrial machine generates electrical noise or transients, which can affect the operation of equipment that is on or part of the industrial machinery.


The committee statement for FR 14 indicates that: The effects on other equipment within the surrounding area must be considered but the machine is not required to have noise suppression for other such equipment. It should be clearly stated in the requirement that is what is intended. Related Item First Revision No. 14-NFPA 79-2016 [Section No. 4.4.2]




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Transient suppression, isolation, or other appropriate means shall be provided where necessary to ensure that the electrical equipment

of an industrial machine generates electrical noise or transients, which can affect the operation of equipment does not generate electromagnetic disturbances above levels that are appropriate for its intended operating environment and has a sufficient level of immunity to electromagnetic disturbances so that it can function in its intended environment.


The intent of PI155 was to clarify the scope of where EMC mitigation techniques are required. The proposed text has incorporated language from IEC 60204-1 to clarify the intent of the requirement. Related Item Public Input No. 155-NFPA 79-2016 [Section No. 4.4.2]

First Revision No. 14-NFPA 79-2016 [Section No. 4.4.2]




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Public Comment No. 16-NFPA 79-2016 [ Section No. 4.8 ]

4.8 Available Fault Current.

The available fault current at the point of supply to each industrial control panel of a machine shall not be greater than the short-circuit current rating marked on the industrial control panel nameplate.




NOTE: This Public Comment appeared as CC Note No. 11 in the First Draft Report on First Revision No. 15, and is also related to Public Input No. 101. The Correlating Committee directs the committee to give further consideration to the negative comments expressed in voting on FR 15. This action will be considered as a public comment. Related Item First Revision No. 15-NFPA 79-2016 [Section No. 4.8]

Public Input No. 101-NFPA 79-2016 [Section No. 4.8]




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Correlating Committee Note No. 11-NFPA 79-2016 [ Section No. 4.8 ]



Organization: NFPA

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CommitteeStatement:

The Correlating Committee directs the committee to give further consideration to thenegative comments expressed in voting on FR 15.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.


1 of 2 11/9/2016 12:57 PM


Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 12:57 PM

Committee Statement

Committee Action:



Statement: The revised text addressed the concerns of the negative comment during voting as directed by the CC and is consistent with changes made to address the machine supply circuit. Available fault current is the most consistent term for the amount of current available during a short circuit. .

Public Comment No. 12-NFPA 79-2016 [ Chapter 5 [Title Only] ]

Incoming Supply Circuit Conductor Terminations and Devices for Disconnecting Means and Removing Power


The title change made in the FR gives the reader the impression that Chapter 5 has been reduced to cover only supply circuit terminations and disconnecting means, which it has not. The proposed text restores the 2015 edition title as it more accurately reflects the topics including incoming supply terminal terminations, supply circuit disconnecting means, means for removal of power to prevent unexpected startup, and devices for disconnecting electrical equipment. In addition, the title more closely aligns with that in IEC 60204-1 and maintains harmonization. Related Item First Revision No. 25-NFPA 79-2016 [Chapter 5 [Title Only]]




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Committee Action:



Statement: This revised title indicates that the means for disconnecting power to a machine’s supply circuit conductor terminations and/or other permitted circuit conductors associated with machine equipment are located in this chapter. This simplification will better assist readers of the document which chapter of the standard to refer to for disconnecting means. The TC reconsidered the ballot comments as directed by the CC during revision of the title.


Chapter 5 [Title Only]




NOTE: This Public Comment appeared as CC Note No.13 in the First Draft Report on First Revision No. 25, and is also related to Public Input No. 130. The Correlating Committee directs the committee to give further consideration to the comments expressed in voting on FR 25. This action will be considered as a public comment. Related Item First Revision No. 25-NFPA 79-2016 [Chapter 5 [Title Only]]

Public Input No. 130-NFPA 79-2016 [Chapter 5 [Title Only]]




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Committee Statement

Committee Action:



Statement: This revised title indicates that the means for disconnecting power to a machine’s supply circuit conductor terminations and/or other permitted circuit conductors associated with machine equipment are located in this chapter. This simplification will better assist readers of the

Correlating Committee Note No. 13-NFPA 79-2016 [ Chapter 5 [Title Only] ]



Organization: NFPA

Street Address:

City:

State:

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CommitteeStatement:

The Correlating Committee directs the committee to give further consideration to thecomments expressed in voting on FR 25.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.


1 of 2 11/9/2016 12:59 PM


Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 12:59 PM

document which chapter of the standard to refer to for disconnecting means. The TC reconsidered the ballot comments as directed by the CC during revision of the title.

Public Comment No. 18-NFPA 79-2016 [ Section No. 5.3.1 [Excluding any Sub-Sections] ]

The following general requirements apply to 5.3.2 through 5.3.5.




NOTE: This Public Comment appeared as CC Note No. 15 in the First Draft Report on First Revision No. 24, and is also related to Public Input Nos. 134, 157, 187 & 188. The Correlating Committee directs the committee to review the use of the phrase “plainly indicates” in (7). The Correlating Committee further directs the committee to give further consideration to the comments expressed in voting on FR 24. This action shall be considered as a public comment. Related Item First Revision No. 24-NFPA 79-2016 [Section No. 5.3]

Public Input No. 134-NFPA 79-2016 [Section No. 5.3.1.1.1]

Public Input No. 157-NFPA 79-2016 [Section No. 5.3.1.3]






Street Address:

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Committee Statement

Committee Action:






Organization: NFPA

Street Address:

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CommitteeStatement:

The Correlating Committee directs the committee to review the use of the phrase“plainly indicates” in (7).

The Correlating Committee further directs the committee to give further considerationto the comments expressed in voting on FR 24.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.


1 of 2 11/9/2016 1:00 PM

Holub, Richard A.


Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 1:00 PM

Statement: The concept to replace the term “incoming” with “machine” clarifies the machine’s supply circuit is the one that originates from the premises wiring. Adding the word “machine” before the words “supply circuit” clarifies to the users of the document which requirements apply to circuits supplying the machine and which requirements apply to other permitted circuits originating from the machine (load side of the machine supply circuit disconnecting means). Other changes were made as necessary so the requirements read correctly and align with the new definition of a "Machine Supply Circuit." In "show markup" The parenthetical term "plug/socket", and the term "plainly" were also deleted to be consistent with their deletion in other sections. Section 5.3.3.1 (6) (a), (b), and (c) were incorrectly renumbered and underlined and must be restored. Section 5.4.4 (2) (a), (b), (c) and (d) were incorrectly renumbered and underlined and must be restored. Revise Exception No. 1 to Section 5.3.1.4 as a separate ballotable detail SR-54 Revise text to Section 5.3.3.1 (3) as a separate ballotable detail SR-55 Revise Section 5.3.5.1 (4) as a separate ballotable detail SR-56

Public Comment No. 30-NFPA 79-2016 [ Section No. 5.3.1.1.2 ]

5.3.1.1.2

A main disconnecting means shall be marked as main if multiple disconnecting means are supplied from the main disconnecting means.


As most machines contain local disconnecting means (e.g. local motor disconnects) which are fed from the main disconnecting means, the proposed requirement would nearly always apply. It is unclear how this new marking requirement would increase safety and therefore should not be implemented. Related Item First Revision No. 24-NFPA 79-2016 [Section No. 5.3]

Public Input No. 134-NFPA 79-2016 [Section No. 5.3.1.1.1]




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Committee Statement

Committee Action:





5.3.1.4

Each incoming supply circuit disconnecting means mounted within or adjacent to the control enclosure shall be interlocked with the control enclosure in accordance with 6.2.3.1.

Exception: An interlock within the control enclosure shall not be required where the use of a key or tool is required for opening the supply circuit disconnecting means enclosure to access exposed live parts. A safety sign shall be provided in accordance with Section 16.2.Exception: Where a Where an incoming supply circuit disconnecting means supplying machines totaling 2 hp or less is not located within or adjacent to the control enclosure it supplies, the control enclosure shall comply with 6.2.3.1 or 6.2.3.2. Where a an incoming supply disconnecting means is an attachment plug and receptacle, the control enclosure it supplies shall comply with 6.2.3.2. Where compliance with6.2.3.2 is required, a safety sign shall be provided in accordance with Section 16.2.


The new exception to 5.3.1.4 replaces the requirements for interlocking of the enclosure door with the supply circuit disconnecting means with the simple requirement of the enclosure needing a tool to open and a safety sign. Enclosure interlocking requirements, as stated in the 2015 NFPA 79 handbook, are recognized as "a key component for protection from electric shock." It is unclear how the committee statement “provides another option that meets an equivalent control as the existing requirements" can be substantiated and therefore the exception should be deleted. Related Item First Revision No. 24-NFPA 79-2016 [Section No. 5.3]




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Committee Statement

Committee Action:



Statement: The revised text clarifies the required construction of the equipment to use this exception. This detail is on SR-53 Section 5.3.1.4 to revise Exception No.1.


5.3.1.4

Each supply circuit disconnecting means mounted within or adjacent to the control enclosure shall be interlocked with the control enclosure in accordance with 6.2.3.1.

Exception: An interlock within the control enclosure shall not be required where the use of a key or tool is required for opening the supply circuit disconnecting means enclosure to access exposed live parts. A safety sign shall be provided in accordance with Section 16.2.Exception: Where a supply circuit disconnecting means supplying machines totaling 2 hp or less is not located within or adjacent to the control enclosure it supplies, the control enclosure shall comply with 6.2.3.1 or 6.2.3.2. Where a supply disconnecting means is an attachment plug and receptacle, the control enclosure it supplies shall comply with 6.2.3.2. Where compliance with6.2.3.2 is required, a safety sign shall be provided in accordance with Section 16.2.


The exception reduces safety considerably by overriding the requirement to electrically or mechanically interlock the supply circuit disconnecting means with the main control cabinet as most control cabinets require a tool or key to open them. Additionally, the exception requires the use of a sign in accordance with 16.2 but fails to provide the wording to be included on the sign. The discussion that drove the addition of this exception to 5.3.1.4 was related to some confusion in the industry as to what disconnect was the subject of the interlocking requirements in 6.2.4. A limited number of readers of NFPA 79 were not certain of whether the requirements in 6.2.4 applied to a disconnecting means for a control cabinet that was downstream of the main control cabinet. This question occasionally comes up in NFPA 79 classes and to NFPA staff providing advisory service on NFPA 79. However, once it is explained the requirement to electrically or mechanically interlock the door apply to the disconnecting means for the supply circuit to the machine there is no confusion. A downstream control cabinet, with or without, an individual disconnecting means already only requires a tool to enter. There is no requirement there to electrically or mechanically interlock the door with the contained or adjacent disconnecting means. The Technical Committee revised the text related the supply circuit requirements by removing “incoming” from in front of “supply.” I am not certain this was the right action without adding a definition of the “supply circuit” to a machine. The term “incoming” may have seemed redundant to “supply” but it was intended to identify the circuit that is the subject of the requirements was the circuit that originated from the premises wiring or other source of power such as an onboard power supply and not one that runs between the main control cabinet and downstream control cabinet. A companion comment has been submitted to allow consideration of a definition of the machine supply circuit which may help clarify the interlocking requirements.


Related Comment Relationship Public Comment No. 33-NFPA 79-2016 [New Section after 3.3.69]

Related Item First Revision No. 24-NFPA 79-2016 [Section No. 5.3]




Street Address:

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Committee Statement

Committee Action:



Statement: The revised text clarifies the required construction of the equipment to use this exception. This detail is on SR-53 Section 5.3.1.4 to revise Exception No.1.


5.3.2 Type.

The supply circuit disconnecting device shall be one of the following types:

(1) A listed motor circuit switch (switch disconnector) rated in horsepower

(2) A listed molded case circuit breaker

(3) A listed molded case switch

(4) An instantaneous trip circuit breaker that is part of a listed combination motor controller limited to single motor applications

(5) A listed self-protected combination controller limited to single motor applications

(6) An attachment plug and receptacle (plug/socket combination) for cord connection


Delete the parenthetical term. The committee agreed to do this as indicated in the Committee Statement to FR 50 for the 2015 edition. The terms described do not always match the term they follow as many times they are not directly interchangeable. Annex J was added to help users understand the differences between terms used in other standards. TG2 Luis Bas - Chair; Paul Dobrowsky; Brett Imlah; Daleep Mohla; Dino Mariuz; Richard Trainor Related Item Public Input No. 144-NFPA 79-2016 [Section No. 3.3.91]




Affilliation: TG2

Street Address:

City:

State:

Zip:


Committee Statement

Committee Action:



Statement: The concept to replace the term “incoming” with “machine” clarifies the machine’s supply circuit is the one that originates from the premises wiring. Adding the word “machine” before the words “supply circuit” clarifies to the users of the document which requirements apply to

circuits supplying the machine and which requirements apply to other permitted circuits originating from the machine (load side of the machine supply circuit disconnecting means). Other changes were made as necessary so the requirements read correctly and align with the new definition of a "Machine Supply Circuit." In "show markup" The parenthetical term "plug/socket", and the term "plainly" were also deleted to be consistent with their deletion in other sections. Section 5.3.3.1 (6) (a), (b), and (c) were incorrectly renumbered and underlined and must be restored. Section 5.4.4 (2) (a), (b), (c) and (d) were incorrectly renumbered and underlined and must be restored. Revise Exception No. 1 to Section 5.3.1.4 as a separate ballotable detail SR-54 Revise text to Section 5.3.3.1 (3) as a separate ballotable detail SR-55 Revise Section 5.3.5.1 (4) as a separate ballotable detail SR-56


5.3.3.1*

Where the supply circuit disconnecting device is one of the types in 5.3.2(1) through 5.3.2(5), the device shall fulfill all of the following requirements:

(1) Isolate the electrical equipment from the supply circuit and have one off (open) and one on (closed) position only. Circuit breakers, instantaneous trip circuit breakers, molded-case switches, and self-protected combination motor controllers are permitted to have a reset (tripped) position between off (open) and on (closed).

(2) Have an external operating means (e.g., handle) that complies with 5.3.4.

Exception: Power-operated switchgear need not be operable from outside the enclosure where there are other means to open it.

(3) Be provided with a permanent means permitting it to be locked in the off (open) position only (e.g., by padlocks), independent of the door or cover position, that also prevents . When so locked, remote as well as local closing into the ( on ) position shall be prevented.

(4) Simultaneously disconnect all ungrounded conductors of the power supply circuit.

(5) Be operable by qualified persons independent of the door or cover position without the use of accessory tools or devices.

(6) Be rated for the application as follows:

With an

(a) The ampere rating shall be at least 115 percent of the sum of the full-load currents required for all equipment that is

in operation at the same time under normal conditions of use.

(b) Where rated in horsepower,

with a

(b) the horsepower rating shall be at least equal to that which is defined by Table 430.251(B) of NFPA 70 for a locked rotor current equal to the largest sum resulting from the locked rotor currents of any combination of motors that can be started simultaneously and the full-load currents of the remaining motor and non-motor loads that can be operated at that time.

With a

(c) The voltage rating shall be at least equal to the nominal supply circuit voltage.

(7) Be of a type that plainly indicates whether it is in the off (open) or on (closed) position.


The proposed text restores the current edition text as follows: 5.3.3.1(3) Restores "when so locked" to more clearly indicate that the preventing of closing only occurs when locked. 5.3.3.1(6) Restoring to current edition text as no substantiation was made for the changes. The intent is to maintain (a), (b), (c) numbering which was changed by the online submission tool. Related Item Public Input No. 187-NFPA 79-2016 [Section No. 5.3]

First Revision No. 24-NFPA 79-2016 [Section No. 5.3]




Street Address:

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Committee Statement

Committee Action:



Statement: The Committee restores "when so locked" to more clearly indicate that the preventing of closing only occurs when locked. This is a ballotable detail on Section 5.3.3.1 (3) for SR-53.


5.3.3.2*

When the supply circuit disconnecting device is an attachment plug and receptacle (plug/socket combination), it shall fulfill all of the following requirements:

(1) Have a load-break rating or be interlocked with a switching device that is load-break rated and complies with 5.3.3.1(6)

(2) Be listed as a switch-rated plug and receptacle (plug/socket combination) rated receptacle rated greater than 20 amperes or 2 hp

(3) Be of such a type and be so installed as to prevent unintended contact with live parts at any time, even during insertion or removal of the connectors

(4) Have a first-make, last-break electrical grounding contact

(5) Have a retaining means to prevent unintended or accidental disconnection where rated at more than 20 amperes

(6) Be located within sight from the operator station and be readily accessible






Affilliation: TG2

Street Address:

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State:

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Committee Statement

Committee Action:





5.3.5.1

The following circuits shall not be required to be disconnected by the main supply circuit disconnecting means:

(1) Lighting circuits for lighting needed during maintenance or repair

(2) Attachment plugs and receptacles (plug and socket outlets) for receptacles for the exclusive connection of repair or maintenance tools and equipment (e.g., hand drills, test equipment)

(3) Undervoltage protection circuits that are only used for automatic tripping in the event of supply circuit failure

(4) Circuits supplying equipment that are required to remain energized for satisfactory operation [e.g., temperature-controlled measuring devices, product (work in progress) heaters, program storage devices, inputs, non-motion outputs, and displays]






Affilliation: TG2

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Committee Statement

Committee Action:





5.3.5.1

The following circuits shall not be required to be disconnected by the main supply circuit disconnecting means:

(1) Lighting circuits for lighting needed during maintenance or repair

(2) Attachment plugs and receptacles (plug and socket outlets) for the exclusive connection of repair or maintenance tools and equipment (e.g., hand drills, test equipment)

(3) Undervoltage protection circuits that are only used for automatic tripping in the event of supply circuit failure

(4) Circuits supplying equipment that are required to remain energized for satisfactory operation [e.g., temperature-controlled measuring devices, product (work in progress) heaters, program storage devices, inputs, non-motion outputs, and displays, safety interlocks]


Safety interlock circuits are another example of circuits that may be required to remain energized to ensure proper operation of a machine.

Related Item Public Input No. 187-NFPA 79-2016 [Section No. 5.3]

First Revision No. 24-NFPA 79-2016 [Section No. 5.3]




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Committee Statement

Committee Action:



Statement: The TC agreed to add "and safety interlocks" to item "(4)" which are another example of circuits that may need to remain energized to ensure proper operation of a machine. This ballotable detail is to revise Section 5.3.5.1 (4) for SR-53.


5.5.4

The following devices shall be permitted to fulfill the isolating function of 5.5.3:

(1) Devices described in 5.3.2

(2) A manual motor controller marked “suitable as motor disconnect” and in compliance with UL 508 where located on the load side of the last short-circuit protective device (in the branch)

(3) System isolation equipment that incorporates control lockout stations and is listed for disconnection purposes where located on the load side of the main supply circuit disconnecting means and overcurrent protection


Add the word "in" after and to be grammatically correct. Related Item First Revision No. 24-NFPA 79-2016 [Section No. 5.3]




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Committee Statement

Committee Action:





[Chapter 6]




NOTE: This Public Comment appeared as CC Note No.19 in the First Draft Report on First Revision No. 28, and is also related to Public Input Nos. 97, 137, 143, 162, 184, 185 & 186. The Correlating Committee directs the committee to give further consideration to the comments expressed in voting on FR 28. The Correlating Committee further directs the committee to reconsider its action related to what was added in 6.4.1.2 where "Class 2 circuits, as covered in...Article 725 of NFPA 70 (NEC), shall be permitted to be used to provide protection from electric shock and other hazards.” In addition, the Correlating Committee directs the committee to review the use of the phrase “plainly visible” in 6.5.1 Exception No. 2. This action will be considered as a public comment. Related Item First Revision No. 28-NFPA 79-2016 [Chapter 6]




Public Input No. 162-NFPA 79-2016 [Chapter 6]

Public Input No. 184-NFPA 79-2016 [Section No. A.6.2]

Public Input No. 185-NFPA 79-2016 [Section No. A.6.2.4.1]

Public Input No. 186-NFPA 79-2016 [Section No. A.6.3.1.1]




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Committee Statement

Committee Action:

Rejected

Resolution: The TC reconsidered the comments in FR 28 on the Class 2 circuits and based on the definition in 725.2 and the informational note to the definition of electrical hazard in NFPA 70E. The TC determined that the current language is appropriate. The TC determined that the "plainly visible" issue was addressed by the Global SR-1, which removed "plainly". See actions taken on Second Revisions 14 and 15 on use of the terms basic protection and fault protection.


6.4.2

PELV circuits shall satisfy all of the following conditions: (1) The nominal voltage shall not exceed the following:

Correlating Committee Note No. 19-NFPA 79-2016 [ Chapter 6 ]


Submitter Full Name: Diane Matthews

Organization: NFPA

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CommitteeStatement:


The Correlating Committee further directs the committee to reconsider its action related towhat was added in 6.4.1.2 where "Class 2 circuits, as covered in...Article 725 of NFPA 70(NEC), shall be permitted to be used to provide protection from electric shock and otherhazards.”

In addition, the Correlating Committee directs the committee to review the use of thephrase “plainly visible” in 6.5.1 Exception No. 2.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All


1 of 2 11/9/2016 1:01 PM

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.


Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 1:01 PM

(a) 30 volts ac (rms value) or 60 volts dc (ripple-free) when the equipment is used in normally dry locations and when large area contact of live parts with the human body is not expected

(b) 6 volts ac (rms value) or 15 volts dc (ripple-free) in all other cases

(2) One side of the circuit or one point of the source of the supply of that circuit shall be connected to the equipment grounding circuit.

(3) Live parts of PELV circuits shall be electrically separated from other live circuits. Electrical separation shall be not less than that required between the primary and secondary circuits of a safety isolating transformer.

(4) Conductors of each PELV circuit shall be physically separated from those of any other circuit. When this requirement is impracticable, the insulation provisions of 13.1.3 shall apply.

(5) Attachment plugs and receptacles (plugs and socket combinations) for receptacles for a PELV circuit shall conform to the following:

(a) Attachment plugs

(plugs)

(a) shall not be able to enter

receptacles (socket-outlets) of

(a) receptacles of other voltage systems.

(b) Receptacles

(socket-outlets)

(b) shall not admit plugs of other voltage systems.






Affilliation: TG2

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Committee Statement

Committee Action:





7.2.10.1*

Each motor controller and its associated wiring shall be protected as an individual branch circuit by a short-circuit protective device (SCPD) as specified by the controller manufacturer. The maximum rating of the designated SCPD shall be as shown in Table 7.2.10.1. Exception No. 1: Table 7.2.10.1 shall not apply to Design B energy efficient motor circuits. The provisions of NFPA 70 shall be observed for Design B energy efficient motor circuits. Exception No. 2: Where the controller is an adjustable speed drive that is listed and marked “Suitable for Output Conductor Protection,” the maximum rating of the designated SCPD shall be determined by replacing the full-load current in Table 7.2.10.1 with the drive’s rated input current. The SCPD shall not exceed the rating marked on the adjustable speed drive or in the manufacturer’s instructions.

Table 7.2.10.1 Maximum Rating or Setting of Fuse and Circuit Breakers: Motor, Motor Branch Circuit, and Motor Controller

Full-Load Current (%)

Fuse Class with Non–Time Delay AC-2 AC-3 AC-4 R 300 300 300

CF or J 300 300 300

CC 300 300 300

T 300 300 300 Type of Application2

Fuse Class with Time Delay1 AC-2 AC-3 AC-4

RK-53 150 175 175

RK-1 150 175 175

CF or J 150 175 225

Full-Load Current (%)

Fuse Class with Non–Time Delay AC-2 AC-3 AC-4 CC 150 300 300

Instantaneous trip circuit breaker4 800 800 800

Inverse trip circuit breaker5 150 250 250

Note: Where the values determined by this table do not correspond to the standard sizes or ratings, the next higher standard size, rating, or possible setting shall be permitted. 1 Where the rating of a time-delay fuse (other than CC type) specified by the table is not sufficient for the starting of the motor, it shall be permitted to be increased but shall in no case be permitted to exceed 225 percent. The rating of a time-delay Class CC fuse and non–time-delay Class CC, J, CF, or T fuse shall be permitted to be increased but shall in no case exceed 400 percent of the full-load current. 2 Types of starting duty are as follows:

(a) AC-2: All light-starting duty motors, including slip-ring motors; starting, switching off

(b) AC-3: All medium starting duty motors including squirrel-cage motors; starting, switching off while running, occasional inching, jogging, or plugging but not to exceed 5 operations per minute or 10 operations per 10 minutes and all wye-delta and two-step autotransformer starting motors

(c) AC-4: All heavy starting duty motors including squirrel-cage motors; starting, plugging, inching, jogging 3Unless a motor controller is listed for use with RK-5 fuses, Class RK-5 fuses shall be used only with NEMA-rated motor controllers. 4Instantaneous trip circuit breakers shall be permitted to be used only if they comply with all of the following:

(a) They are adjustable.

(b) Part of the combination controller has motor-running protection, short-circuit protection, and ground-fault protection in each conductor.

(c) The combination is especially identified for use.

(d) It is installed per any instructions included in its listing or labeling.

(e) They are limited to single motor applications; circuit breakers with adjustable trip settings are tobe set at the controller manufacturer's recommendation, but not greater than 1300 percent of the motor full-load current. 5Where the rating of an inverse time circuit breaker specified in this table is not sufficient for the starting current of the motor, it shall be permitted to be increased but in no case exceed 400 percent for full-load currents of 100 amperes or less or 300 percent for full-load currents greater than 100 amperes.

7.2.10.1.1

A listed self-protected combination controller shall be permitted in lieu of the devices specified in Table 7.2.10.1 for branch circuit and overload protection of a single motor circuit.

7.2.10.1.2

Where a listed self-protected combination controller has an adjustable, instantaneous trip setting, the setting shall not exceed 1300 percent of full-load motor current for other than Design B energy efficient motors and not more than 1700 percent of full-load motor current for Design B energy efficient motors.




NOTE: This Public Comment appeared as CC Note No. 14 in the First Draft Report on First Revision No. 65, and is also related to Public Input No. 164. The Correlating Committee directs the committee to give further consideration to the comments expressed in voting on FR 65. This action will be considered as a public comment. Related Item First Revision No. 65-NFPA 79-2016 [Section No. 7.2.10.1 [Excluding any Sub-Sections]]

Public Input No. 164-NFPA 79-2016 [Section No. 7.2.10.1 [Excluding any Sub-Sections]]




Street Address:

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Committee Statement

Committee Action:



Statement: The text has been revised to clarify that the exception is permitted to be used but not required. The TC has considered the comments as directed by the CC and determined that no additional revisions are required.


7.2.10.2

Several motors, each not exceeding 1 hp in rating, shall be permitted on a nominal 120-volt branch circuit protected at not over 20 amperes or a 6001000-volt nominal or less branch circuit, protected at not over 15 amperes, where all of the following conditions are met:

(1) The full-load rating of each motor does not exceed 6 amperes.

Correlating Committee Note No. 14-NFPA 79-2016 [ Section No. 7.2.10.1

[Excluding any Sub-Sections] ]



Organization: NFPA

Street Address:

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CommitteeStatement:



Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.


1 of 2 11/9/2016 1:02 PM

Holub, Richard A.


Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 1:02 PM

(2) The rating of the branch-circuit short-circuit and ground-fault protective device marked on any of the controllers is not exceeded. The short-circuit and ground-fault protection is provided by a single inverse time circuit breaker or single set of fuses.

(3) Individual overload protection conforms to Section 7.3.


This comment is an output of the 1000V NFPA79 Task Group. The revised change aligns with 430.53(A) in the 2017 NEC. Related Item First Revision No. 3-NFPA 79-2016 [Section No. 1.1.1]




Street Address:

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Committee Statement

Committee Action:

Accepted


Statement: This comment is an output of the 1000V NFPA79 Task Group. The revised change aligns with 430.53(A) in the 2017 NEC.


7.2.10.4

Two or more motors, or one or more motor(s) and other load(s), and their control equipment shall be permitted to be connected to a single branch circuit where short-circuit and ground-fault protection is provided by a single inverse time circuit breaker or a single set of fuses, provided the following conditions under 7.2.10.4(1) and either 7.2.10.4(2) or 7.2.10.4(3) are met:

(1) Each motor controller and overload device is either listed for group installation with specified maximum branch-circuit protection or selected such that the ampere rating of the motor branch short-circuit and ground-fault protective device does not exceed that permitted by 7.2.10.1 for that individual motor controller or overload device and corresponding motor load.

(2) The rating or setting of the branch short-circuit and ground-fault protection device does not exceed the values in Table 7.2.10.4 for the smallest conductor in the circuit.

Exception: Where a controller is an adjustable speed drive that is listed and marked “Suitable for Output Conductor Protection,” the conductors from the drive to the motor shall not apply to determining the smallest conductor in the circuit. The conductors from the drive to the motor shall have an ampacity in accordance with Sections 12.5 and 12.6.

(3) The rating or setting of the branch short-circuit and ground-fault protection does not exceed the value specified in 7.2.10.1 for the highest rated motor connected to the branch circuit plus an amount equal to the sum of the full-load current ratings of all other motors and the ratings of other loads connected to the circuit. Where this calculation results in a rating less than the ampacity of the branch circuit conductors, it shall be permitted to increase the maximum rating of the fuses or circuit breaker to a value not exceeding that permitted by Sections 12.5 and 12.6. Overcurrent protection for loads other than motor loads shall be in accordance with 7.2.3, 7.2.4, and 7.2.11. Where 16 AWG or 18 AWG conductors are used for branch circuit conductors or tap conductors under 7.2.10.5, the rating and type of the branch short-circuit and ground-fault protection shall be in accordance with 12.6.1.

Table 7.2.10.4 Relationship Between Conductor Size and Maximum Rating or Setting of Short-Circuit Protective Device for Power Circuits Group Installations

Conductor Size .

(AWG)

Maximum Rating .

Fuse or Inverse Time* .

Circuit Breaker .

(amperes)

18 See footnote.

16 See footnote.

14 60

12 80

10 100

8 150

6 200

4 250

3 300

2 350

1 400

0 500

2/0 600

3/0 700

4/0 800

*Maximum ratings and type of branch short-circuit and ground-fault protective devices for 16 AWG and 18 AWG shall be determined in accordance with 12.6.1.


File Name Description Approved

Correlating Committee Note No. 12-NFPA 79-2016 [ Section No. 7.2.10.4 ]



Organization: NFPA

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CommitteeStatement:

The Correlating Committee directs the committee to clarify the phrase “the conductorsfrom the drive to the motor shall not apply to determining the smallest conductor in thecircuit” and consider substituting the word “to” with the word “where" as it appears beforethe the word "determining."


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.



1 of 2 11/9/2016 1:04 PM

Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 1:04 PM

CN_12.pdf NFPA 79 CC Note # 12


NOTE: This Public Comment appeared as CC Note No. 12 in the First Draft Report on First Revision No. 60, and is also related to Public Input No. 163. The Correlating Committee directs the committee to clarify the phrase “the conductors from the drive to the motor shall not apply to determining the smallest conductor in the circuit” and consider substituting the word “to” with the word “where" as it appears before the word "determining." This action shall be considered as a public comment. Related Item First Revision No. 60-NFPA 79-2016 [Section No. 7.2.10.4]





Street Address:

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Committee Statement

Committee Action:



Statement: The Technical Committee has revised the text in exception No. 2 for clarity for application of a single branch circuit supplying two or more motors, or one or more motor(s) and other load(s), and their control equipment .


7.2.10.5

For group installations described in 7.2.10.4(3), the conductors of any tap supplying a single motor shall not be required to have an individual branch-circuit short-circuit and ground-fault protective device, provided they comply with one of the following:

(1) No conductor to the motor shall have an ampacity less than that of the branch-circuit conductors.

(2) No conductor to the motor shall have an ampacity less than one-third that of the branch-circuit conductors, with a minimum in accordance with Sections 12.5 and 12.6, the conductors to the motor overload device being not more

than 7.5 m (25 ft) long and being suitably protected from physical damage in accordance with Chapter 13.

(3) Conductors from the point of the tap from the branch-circuit short-circuit and ground-fault protective device to a listed manual motor controller additionally marked “Suitable for Tap Conductor Protection in Group Installations” or to a branch circuit protective device shall be permitted to have an ampacity not less than 1/10 the rating or setting of the branch-circuit short-circuit and ground-fault protective device. The conductors from the controller to the motor shall have an ampacity in accordance with Sections 12.5 and 12.6. The conductors from the branch-circuit short-circuit and ground-fault protective device point of the tap to the controller shall (1) be enclosed either by an enclosed controller or by a raceway and be not more than 3 m (10 ft) long or (2) have an ampacity not less than that of the branch-circuit conductors.


The proposed changes are identical to those in PI 158 which should have been accepted. These changes are Intended to correlate with the 2017 NEC 430.53(D)(3). Related Item Public Input No. 158-NFPA 79-2016 [Section No. 7.2.10.5]




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Committee Statement

Committee Action: Accepted


Statement: The TC has revised the text to correlate with 430.53(D)(3) of NFPA 70 2017.


7.8.1 Surge Protection for Safety Interlock Circuits.

Industrial machinery with safety interlock circuits shall have surge protection installed.


Insert as a new .8.1 and renumber the existing subdivisions. This requirement was added as NEC 670.6 for the 2017 NEC based on FR 3357. It might be outside the scope of Article 670 but it seems that NFPA 79 should either be consistent or have the requirement removed from the NEC. "Industrial machinery with safety interlock circuits shall have surge protection installed." This is the panel statement: The study, “Data Assessment for Electrical Surge Protective Devices” commissioned by the Fire Protection Research Foundation, 1 Batterymarch Park, Quincy, MA 02169-7471, provides results of a 2013 and 2014 survey of facility managers concerning surge damage. It shows that 26% had damage to safety interlocking systems on machines due to surges. These safety interlocking systems are in place to protect workers from interactions with the machinery. Related Item First Revision No. 60-NFPA 79-2016 [Section No. 7.2.10.4]




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Committee Statement

Committee Action:

Rejected

Resolution: The technical committee revised the existing requirement in 7.8.1 to require an appropriate SPD for protection of industrial machinery with safety interlock circuits to correlate with NFPA 70 670.6. The manufacturer of the industrial machinery can determine what specific type of SPD is to be used to provide the needed protection based on the installation and equipment design. The intent of the comment was to REVISE 7.8.1 not create a new section following it. The comment was rejected and the submitter s intent was met by revising 7.8.1 with the language the TC voted on. Additionally, in the title, "Protection" was revised to "Protective" to correlate with the term in Article 285 of NFPA 70.


7.9 Power Factor Correction Capacitor Overcurrent Protection.

Where capacitors are installed for motor power factor correction on circuits of 600 volts1000 volts, nominal, and under, overcurrent protection for the conductors shall be provided. Each capacitor cell or capacitor bank shall be protected against rupture of the individual cells. Protection included as a part of the capacitor assembly shall be permitted.


This comment is an output of the 1000V NFPA79 Task Group. The proposed change increases the voltage to 1000V to include all equipment covered by the revised scope change.

Related Item First Revision No. 3-NFPA 79-2016 [Section No. 1.1.1]




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Committee Statement

Committee Action:

Accepted


Statement: The proposed change increases the voltage to 1000V to include all equipment covered by the revised scope change.


8.1.2 Connections.

Except at either the source or first disconnecting means of a grounded separately derived system, grounded conductors shall not be connected to the equipment grounding conductor.




NOTE: This Public Comment appeared as CC Note No. 16 in the First Draft Report on First Revision No. 66. The Correlating Committee directs the committee to give further consideration to the comments expressed in voting on FR 66 to ensure the use of consistent terminology with the National Electrical Code. This action will be considered as a public comment. Related Item First Revision No. 66-NFPA 79-2016 [Section No. 8.1.2]


Correlating Committee Note No. 16-NFPA 79-2016 [ Section No. 8.1.2 ]



Organization: NFPA

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CommitteeStatement:

The Correlating Committee directs the committee to give further consideration to thecomments expressed in voting on FR 66 to ensure the use of consistent terminology withthe National Electrical Code.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.



1 of 2 11/9/2016 1:05 PM

Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 1:05 PM



Street Address:

City:

State:

Zip:


Committee Statement

Committee Action:



Statement: The first use of the term grounded is unnecessary since an ungrounded separately derived system does not contain a grounded conductor. This change improves clarity. The TC reviewed the CC comments as directed by the CC.


8.1.2 Connections.

Except at either the source or first disconnecting means of a grounded separately a separately derived system, grounded conductors shall not be connected to the equipment grounding conductor.


The first use of the term grounded is unnecessary since an ungrounded separately derived system does not contain a grounded conductor. This change improves clarity. Related Item First Revision No. 29-NFPA 79-2016 [Section No. 8.2]


Submitter Full Name: Bobby Gray

Organization:

Affilliation:

This public comment is provided by the NFPA 79 Chapter 8 Task Group. The Task Group members include: Chair Bobby Gray, Luis Bas, Jim Morrison, Paul Dobrowsky, Matt Egloff, Mike Sorter, George Schreck

Street Address:

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Committee Statement

Committee Action:



Statement: The first use of the term grounded is unnecessary since an ungrounded separately derived system does not contain a grounded conductor. This change improves clarity. The TC reviewed the CC comments as directed by the CC.


8.2.1 Equipment Parts.

The equipment frame and all non-current-carrying conductive parts, material, or other equipment likely to become energized shall be bonded together and connected to an equipment grounding conductor or bonding jumper. Exception: Small parts such as screws, rivets, and nameplates that are not likely to become energized shall not be required to be grounded.

8.2.1.1 Effective Ground Fault Current Path.

All parts of the effective ground fault current path shall be capable of withstanding the highest thermal and mechanical stress that can be caused by fault currents in that part of the circuit.

8.2.1.2 Equipment Grounding and Bonding. 8.2.1.2.1

The machine and all exposed, non-current-carrying conductive parts, material, and equipment likely to become energized shall be connected in a manner that provides an effective ground fault current path.

8.2.1.2.2

Where electrical devices are mounted on metal mounting panels that are located within nonmetallic enclosures, the metal mounting panels shall be effectively grounded. Where electrical devices are mounted on metal mounting panels that are located within nonmetallic enclosures, the metal mounting panels shall be connected to an equipment grounding conductor or bonding jumper.

8.2.1.2.3

Where specified by the manufacturer, components and subassemblies shall be bonded in accordance with the manufacturer’s instructions.

8.2.1.3* Equipment Grounding Conductor Terminal. 8.2.1.3.1

For each supply circuit, an equipment grounding conductor terminal shall be provided in the vicinity of the associated phase conductor terminals and connected to the equipment grounding conductor.

8.2.1.3.2

The equipment grounding conductor terminal shall accommodate an equipment grounding conductor sized in accordance with Table 8.2.2.4.

8.2.1.3.3*

The equipment grounding conductor terminal shall be identified with the word “GROUND,” the letters “GND” or “GRD,” the letter “G,” the color GREEN, or the symbol shown in Figure 8.2.1.3.3;in addition, the letters “PE” shall also be permitted to identify this terminal.

Figure 8.2.1.3.3 Grounding Symbol.

8.2.1.3.4

Where an auxiliary grounding electrode is specified, the terminal shall accommodate this additional grounding electrode conductor.




NOTE: This Public Comment appeared as CC Note No. 17 in the First Draft Report on First Revision No. 29, and is also related to Public Input No. 141. The Correlating Committee directs the committee to clarify the use of the word “accommodate” in 8.2.1.3.2 and 8.2.1.3.4 and consider using wording, such as “suitable for use and identified for” similar to 110.14 of the NEC. This action will be considered as a public comment. Related Item First Revision No. 29-NFPA 79-2016 [Section No. 8.2]





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Committee Statement

Committee Action:

Rejected




Organization: NFPA

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CommitteeStatement:

The Correlating Committee directs the committee to clarify the use of the word“accommodate” in 8.2.1.3.2 and 8.2.1.3.4 and consider using wording, such as “suitablefor use and identified for” similar to 110.14 of the NEC.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.



1 of 2 11/9/2016 1:06 PM

Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 1:06 PM

Resolution: The term “accommodate” is the proper term for the context used in 8.2.1.3.2 and 8.2.1.3.4. The suggested language would change the intent of the rule, which is to ensure there is adequate room to add the equipment grounding conductor. The standard dictionary defines “accommodate” as: “to make room for,” which is the intent of the rule.


8.2.1 Equipment Grounding Circuit Parts. The equipment frame and all non-current-carrying conductive parts, material, or other equipment likely to become energized shall be bonded together and connected to an equipment grounding conductor or bonding jumper. Exception: Small parts such as screws, rivets, and nameplates that are not likely to become energized shall not be required to be grounded.

grounding circuit shall consist of the following: (1) Equipment grounding conductor terminal(s) (2) Equipment grounding conductors and equipment bonding jumpers 8.2.1.1 Effective Ground Fault Current Path.

All parts of the effective ground fault current path shall be capable of withstanding the highest thermal and mechanical stress that can be caused by fault currents in that part of the circuit.

8.2.1.2 Equipment Grounding and Bonding. 8.2.1.2.1


Exception: Small parts such as screws, rivets, and nameplates that are not likely to become energized shall not be required to be grounded.

8.2.1.2.2


8.2.1.2.3

Where specified by the manufacturer, components and subassemblies shall be bonded in accordance with the manufacturer’s instructions.

8.2.1.3* Equipment Grounding Conductor Terminal. 8.2.1.3.1

For each incoming supply circuit, an equipment grounding conductor terminal shall be provided in the vicinity of the associated phase conductor terminals and connected to the equipment grounding conductor.

8.2.1.3.2

The equipment grounding conductor terminal shall accommodate an equipment grounding conductor sized in accordance with Table 8.2.2.4.

8.2.1.3.3*

The equipment grounding conductor terminal shall be identified with the word “GROUND,” the letters “GND” or “GRD,” the letter “G,” the color GREEN, or the symbol shown in Figure 8.2.1.3.3;in addition, the letters “PE” shall also be permitted to identify this terminal.

Figure 8.2.1.3.3 Grounding Symbol.

8.2.1.3.4

Where an auxiliary grounding electrode is specified, the terminal shall accommodate this additional grounding electrode conductor.


The comment restores the concept of "grounding circuit" parts which aids in understanding. The requirement in 8.2.1 was deleted as it is already contained in 8.2.1.2, and the exception restored to 8.2.1.2. The term "incoming" in 8.2.1.3.1 was restored to differentiate that the terminal is related to a supply originating from outside the machine Related Item First Revision No. 29-NFPA 79-2016 [Section No. 8.2]





Street Address:

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Committee Statement

Committee Action:

Rejected

Resolution: The proposed language to describe the “Grounding Circuit” is not consistent with the NEC language and would not improve clarity from the First Draft language. The Committee reaffirms the decision regarding the location for the exception for grounding small parts is better served in 8.2.1.2.1. Adding “incoming” before supply is not consistent with language in other parts of the standard.


8.2.1.1 Effective Ground Fault Current Path.

All parts of the Electrical equipment, wiring, and other electrically conductive materialslikely to become energized shall be installed in a manner that creates an effective ground fault current path. It shall be capable of withstanding the highest thermal and mechanical stress that can be caused by fault currents in that part of the circuit safely carrying the maximum ground-fault current likely to be imposed on it from any point where a ground fault may occur to the point of connection of the supply circuit conductors to the electrical equipment of the machine.


The language accepted in the FR could be misunderstood. The proposed language is consistent with the same requirement in NEC 250.4. Related Item First Revision No. 29-NFPA 79-2016 [Section No. 8.2]



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Committee Statement

Committee Action:



Statement: The language accepted in the FR could be misunderstood. The proposed language is consistent with the same requirement in 250.4 of NFPA 70.


8.2.1.2.1


Exception: Equipment parts that are likely to become energized only by a conductor of a circuit operating at 50 volts or less shall not be required to be grounded.


The proposed text is intended to clarify the requirements in 13.2.2.1 Exception 1 regarding use of green conductor where equipment grounding is not required. Related Item First Revision No. 39-NFPA 79-2016 [Section No. 13.2.2.1]





Street Address:

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Committee Statement

Committee Action:

Rejected

Resolution: The proposed language does not address the color of the equipment grounding conductor or provide clarification for use of equipment grounding conductors. Equipment not likely to become energized is not required to be grounded currently as stated in NFPA 70 , Article 250.


8.2.1.2.2



This is an editorial change to address an inadvertent addition of a duplicate sentence during the transition to TerraView. Related Item First Revision No. 29-NFPA 79-2016 [Section No. 8.2]



Organization:

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Committee Statement

Committee Action:

Accepted


Statement: This is an editorial change to address an inadvertent addition of a duplicate sentence during the transition to TerraView.


8.2.1.3.1

For each supply circuit, an equipment grounding conductor terminal shall be provided in the vicinity of the associated phase conductor terminals and shall be connected to the equipment grounding conductor.


“Shall be” is added to improve readability of the text. Related Item First Revision No. 29-NFPA 79-2016 [Section No. 8.2]



Organization:

Affilliation:


Street Address:

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Committee Statement

Committee Action:

Accepted


Statement: “Shall be” is added to improve readability of the text. And "machine" is added Revising the text so it reads “machine supply circuit” clarifies the machine’s supply circuit originates from the premises wiring. This clarification will assist readers of the document with determining which requirements apply to the circuit supplying the machine and which requirements apply to circuits originating from the machine (load side of the machine supply circuit disconnecting means).


8.2.1.3.4

Where an auxiliary grounding electrode is specified by the industrial machinery manufacturer, the terminal shall accommodate this additional grounding electrode conductor.


For other than custom built industrial machinery, the industrial machinery manufacturer has no way of knowing if the installer or user will specify something. This will clarify that the terminal requirement is only necessary to be provided by the industrial machinery manufacturer if they specify an auxiliary grounding electrode. Related Item First Revision No. 29-NFPA 79-2016 [Section No. 8.2]



Organization:

Affilliation: This public comment is provided by the NFPA 79 Chapter 8 Task Group. The Task Group members include: Chair Bobby Gray, Luis

Bas, Jim Morrison, Paul Dobrowsky, Matt Egloff, Mike Sorter, George Schreck

Street Address:

City:

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Committee Statement

Committee Action:



Statement: For other than custom built industrial machinery, the industrial machinery manufacturer has no way of knowing if the installer or user will specify something. This will clarify that the additional terminal requirement is only necessary to be provided by the industrial machinery manufacturer if they specify an auxiliary grounding electrode.


8.2.3.2

Removing a device shall Wire-type equipment grounding conductors and bonding jumpers shall be installed in a manner that removal of a wiring device, such as a receptacle or switch, does not interrupt the continuity of the equipment grounding conductor or bonding jumper.


Pressure connectors and terminal bars are devices and removing them would interrupt the continuity of the equipment grounding conductor. The intent of the requirement is to ensure that devices that are likely to be replaced, can be removed and replaced without losing the effective ground fault path. The sentence is restructured to improve readability. Related Item Public Input No. 141-NFPA 79-2016 [Section No. 8.2]



Organization:

Affilliation:


Street Address:

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Committee Statement

Committee Action:



Statement: Pressure connectors and terminal bars are devices and removing them would interrupt the continuity of the equipment grounding conductor. The intent of the requirement is to ensure that devices that are likely to be replaced, can be removed and replaced without losing the effective ground fault path. The sentence is restructured to improve readability.


8.2.3.4

Raceways, wireways, and cable trays shall not be used as equipment grounding or bonding conductorsEquipment containing energized conductors shall be provided with a separate wire-type equipment grounding conductor or bonding jumper.


The structure of the language is revised to reduce the risk of leaving other types of equipment from the list and provide the intended requirement in positive text. Related Item First Revision No. 29-NFPA 79-2016 [Section No. 8.2]



Organization:

Affilliation:


Street Address:

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Committee Statement

Committee Action:



Statement: The structure of the language is revised to avoid leaving other types of equipment, such as an auxiliary gutters, from the list and instead provides the intended requirement in positive text.


9.1.1.4

The source of supply for all control circuits shall be taken from the load side of the supply disconnecting means.

Exception: The power supply circuit to control circuits meeting the requirements of excepted circuits in 5.3.5.1(4)shall be permitted to be taken from the line side of the supply disconnecting means or other power source.




NOTE: This Public Comment appeared as CC Note No. 18 in the First Draft Report on First Revision No. 59, and is also related to Public Input No. 175. The source of supply for all control circuits shall be taken from the load side of the supply disconnecting means. Exception: The power supply circuit to control circuits meeting the requirements of excepted circuits in 5.3.5.1(4) shall be permitted to be taken from the line side of the supply disconnecting means or other power source. The Correlating Committee directs the committee to clarify the use of the word “to” and consider replacing it with the word “for”. This action shall be considered as a public comment. Related Item First Revision No. 59-NFPA 79-2016 [Section No. 9.1.1.4]





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Committee Statement




Organization: NFPA

Street Address:

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CommitteeStatement:

The Correlating Committee directs the committee to clarify the use of the word “to”and consider replacing it with the word “for”.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.


Kovacik, John R.


1 of 2 11/9/2016 1:07 PM

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 1:07 PM

Committee Action: Rejected but see related SR


Statement: The TC removes the phrase "The power supply circuit to" from the exception for clarity.

Public Comment No. 26-NFPA 79-2016 [ New Section after 9.2.5.3.2 ]

[New Section after 9.2.5.3.2]




NOTE: This Public Comment appeared as CC Note No. 2 in the First Draft Report on First Revision No. 47, and is also related to Public Input No. 170. The Correlating Committee directs the committee to clarify the sentence based on the positive and negative comments expressed in the voting. This action shall be considered as a public comment. Related Item First Revision No. 47-NFPA 79-2016 [New Section after 9.2.5.3.2]

Public Input No. 170-NFPA 79-2016 [New Section after 9.2.5.3.2]




Street Address:

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Committee Statement

Committee Action: Rejected

Resolution: This requirement has been deleted by SR-1, therefore these changes are no longer appropriate.


9.2.5.4 Stop by De-Energization.

Correlating Committee Note No. 2-NFPA 79-2016 [ New Section after 9.2.5.3.2 ]



Organization: NFPA

Street Address:

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CommitteeStatement:

The Correlating Committee directs the committee to clarify the sentence based on thepositive and negative comments expressed in the voting.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.


Kovacik, John R.


1 of 2 11/9/2016 1:08 PM

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 1:08 PM

Except for cycle stop commands (stop by energization), stop functions shall be initiated by de-energization, not energization of a device or as a command to a programmable logic controller (PLC).


The new requirement should be deleted is unclear as to the extent of stop commands it covers and in its reference to the use of Safety PLC's for issuing of stop commands. Stopping by de-energization is presently mentioned in Annex H.2 as one component for minimizing the probability of control function failure. Related Item First Revision No. 47-NFPA 79-2016 [New Section after 9.2.5.3.2]

Public Input No. 170-NFPA 79-2016 [New Section after 9.2.5.3.2]




Street Address:

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Committee Statement

Committee Action:

Accepted


Statement: The new requirement has been deleted because it is unclear as to the extent of stop commands it covers and in its reference to the use of Safety PLC's for issuing of stop commands. Stopping by de-energization is presently mentioned in Annex H.2 as one component for minimizing the probability of control function failure.


9.2.5.4 Stop by De-Energization.

Except for cycle stop commands (stop by energization), stop Stop functions shall be initiated by de-energizationdeenergization, not energization, of a device or as a command to a programmable logic controller (PLC)., except for cycle stop commands (stop by energization),


Revised the language to improve readability. Related Item

First Revision No. 47-NFPA 79-2016 [New Section after 9.2.5.3.2]




Street Address:

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Committee Statement

Committee Action: Rejected

Resolution: This requirement has been deleted by SR-31 , therefore these changes are no longer appropriate.


11.2.1.8

Attachment plugs and receptacles (plug/socket combinations) that are handled during normal operation shall be located and mounted so as to provide unobstructed access.






Affilliation: TG2

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Committee Statement

Committee Action:





11.2.1.10

Busbars shall be securely fastened in place and the minimum spacing between uninsulated parts of busbars, busbar terminals, and other bare metal parts shall not be less than specified in Table 430.97(D) of NFPA 70.


The proposed new requirement should be deleted as it increases the minimum spacing for bus bars used in branch circuits to the same as those in feeder circuits with no substantiation. In addition, it conflicts with existing requirements in Section 11.2.1.3. Related Item First Revision No. 33-NFPA 79-2016 [New Section after 11.2.1.9]

Public Input No. 183-NFPA 79-2016 [New Section after 11.2.1.9]




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Committee Statement

Committee Action:



Statement: The requirement has been revised to indicate the increased spacing is only required for busbars located in feeder circuits.


11.4.8.1

When this is not practicable, it It shall be permissible to place a pocket that is suitable for the environment, outside the door of the control enclosure or compartment, in a well-identified location.


Allow the print pocket to be located elsewhere even if it is practical. Why make someone open an enclosure, possibly exposing themselves to hazards, if they need the documentation. Related Item First Revision No. 35-NFPA 79-2016 [Section No. 11.4.8]




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Committee Statement

Committee Action:



Statement: The TC removes "When it is practicable" to allow the print pocket to be located elsewhere. Someone should not need to open an enclosure, possibly exposing themselves to hazards.

Public Comment No. 76-NFPA 79-2016 [ Section No. 11.5 [Excluding any Sub-Sections] ]

Access and working space for control cabinets and compartments operating at 600 volts1000 volts, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized shall comply with the provisions of Chapter 11.

Sufficient access and working space shall be provided and maintained around all control cabinets and compartments to permit ready and safe operation and maintenance of such control cabinets and compartments. Working space for cabinets and compartments that contain supply conductors to industrial machinery that are covered by Article 670 of NFPA 70 shall be in accordance with the NEC.


This comment is an output of the 1000V NFPA79 Task Group. The proposed change increases the voltage to 1000V to include all equipment covered by the revised scope change and aligns with the 2017 NEC. Related Item First Revision No. 3-NFPA 79-2016 [Section No. 1.1.1]




Street Address:

City:

State:

Zip:


Committee Statement

Committee Action:

Accepted


Statement: The TC changed the requirement to increase the voltage to 1000V to include all equipment covered by the revised scope change and aligns with the 2017 edition of NFPA 70.


11.5.1.1

The depth of the working space in the direction of access to live parts shall not be less than indicated in Table 11.5.1.1. Distances shall be measured from the control cabinet or compartment front or opening.

Table 11.5.1.1 Working Space Depth

Minimum Clear Distance

Nominal Voltage to Ground Condition 1 Condition 2 Condition 3 0–150 914 mm 900 mm (3 ft)914 mm 900 mm (3 ft) 914 mm 900 mm (3 ft)

151–600 914 mm 900 mm (3 ft) 1.07 m 0 m (3 1⁄2 ft) 1.22 m 2 m (4 ft)

601 - 1000 900 mm (3 ft) 1.2 m (4 ft) 1.5 m (5 ft)

Note: Where the conditions are as follows:

Condition 1 — Exposed live parts on one side and no live or grounded parts on the other side of the working space, or exposed live parts on both sides effectively guarded by insulating materials. Insulated wire or insulated busbars operating at not over 300 volts to ground shall not be considered live parts.

Condition 2 — Exposed live parts on one side and a grounded surface on the other side. Concrete, brick, or tile walls shall be considered as grounded.

Condition 3 — Exposed live parts on both sides of the working space (not guarded as provided in Condition 1) with the operator between.

Exception No. 1: Working space shall not be required in back or sides of control cabinets or compartments, where there are no renewable or adjustable parts on the back or sides and where all connections are accessible from locations other than the back or sides. Where rear access is required to work on de-energized parts on the back of enclosed control cabinet and compartment, a minimum working space of 762 mm (2 1⁄2 ft) horizontally shall be provided. Exception No. 2: By special permission, working space clearance depth of 762 mm (2 1⁄2 ft) or less shall be permitted where all uninsulated parts are at a voltage no greater than 50 volts rms ac or 60 volts dc. Exception No. 3: Condition 2 working clearance depth shall be permitted between control cabinets or compartments located across the aisle from each other or across from non-machinery-associated switchgear, panelboards, or motor control centers where conditions of maintenance and supervision ensure that written procedures have been adopted to prohibit the affected equipment doors on both sides of the aisle from being open at the same time and qualified persons who are authorized will service the installation. Exception No. 4: Condition 1 working clearance depth shall be permitted between control cabinets or compartments located across the aisle from each other, or across from a grounded surface, where all associated control cabinet or compartment devices and equipment operating at greater than 50 volts rms ac or 60 volts dc are separately enclosed, guarded, or constructed so that openings to live parts of the devices and equipment will not permit the entry of a 12.5 mm (0.5 in.) diameter rod. Exception No. 5: By special permission, the minimum working space clearance depth of 762 mm (2 1⁄2 ft) shall be permitted where all of the following conditions are met:

(1) The control cabinet or compartment is operating at not over 150 volts line-to-line or line-to-ground.

(2) The conditions of maintenance and supervision ensure that only qualified persons will service the installation.

(3) The control cabinet and compartment require a tool to open.

(4) Where only diagnostic troubleshooting and testing on live parts are involved.

(5) The door(s) of the control cabinet and compartment open at least 90 degrees or are removable.


This comment is an output of the 1000V NFPA79 Task Group. The proposed change increases the voltage to 1000V to include all equipment covered by the revised scope change and aligns with the 2017 NEC changes to Table 110.26(A)(1). One issue the task group identified to be addressed is if the working distances apply to the incoming source voltage or to any working voltage present in the panel including DC voltages. Related Item

First Revision No. 3-NFPA 79-2016 [Section No. 1.1.1]




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Committee Statement

Committee Action:



Statement: This comment is an output of the 1000V NFPA 79 Task Group. The proposed change increases the voltage to 1000V to include all equipment covered by the revised scope change and aligns with the 2017 NEC changes to Table 110.26(A)(1). One issue the task group identified to be addressed is if the working distances apply to the incoming source voltage or to any working voltage present in the panel including DC voltages.


[New Section after 12.5.4]




NOTE: This Public Comment appeared as CC Note No. 3 in the First Draft Report on First Revision No. 55, and is also related to Public Input No. 126. The Correlating Committee directs the committee to give further consideration to the negative comments expressed in voting on FR 55. The Correlating Committee directs the committee to clarify the phrase “based on 125 percent of the highest rated motor at demand factors based on the loading or application of the motors." This action will be considered as a public comment. Related Item First Revision No. 55-NFPA 79-2016 [New Section after 12.5.4]





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CommitteeStatement:

The Correlating Committee directs the committee to give further consideration to thenegative comments expressed in voting on FR 55.

The Correlating Committee directs the committee to clarify the phrase “based on 125percent of the highest rated motor at demand factors based on the loading or applicationof the motors."


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.


1 of 2 11/9/2016 1:09 PM

Holub, Richard A.


Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 1:09 PM




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Committee Statement

Committee Action:



Statement: The TC has considered the negative comments expressed during voting as directed by the CC and deleted the requirement as it can result in smaller unprotected conductors.


12.5.5

Conductors supplying a single motor or multiple motors shall be permitted to be sized based on 125 percent of the highest rated motor at demand factors based on the loading or application of the motors.


The proposed new requirement permits reduction in motor circuit conductor sizing without additional new conductor overload and branch short circuit and ground fault protection rules for general individual-motor branch circuits. For servo motor systems, the change is unnecessary as 19.3.2 already addresses the concerns expressed in the committee statement. Related Item First Revision No. 55-NFPA 79-2016 [New Section after 12.5.4]





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Statement: The TC has considered the negative comments expressed during voting as directed by the CC and deleted the requirement as it can result in smaller unprotected conductors.


13.1.2.1*

Conductors and cables shall be run from terminal to terminal without splices or joints. Connections using plug and receptacle (plug/socket) combinations with protection against accidental disconnection shall not be considered to be joints for this requirement.

Exception No. 1: Splices shall be permitted to leads attached to electrical equipment, such as motors and solenoids. Such splices shall be insulated with oil-resistant electrical tape or insulation equivalent to that of the conductors and installed in a suitable enclosure. Exception No. 2: Where it is impracticable to provide terminals in a junction box (e.g., on mobile machines, on machines having long flexible cables), the use of splices or joints shall be permitted.






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Public Comment No. 90-NFPA 79-2016 [ New Section after 13.2.2.1 ]

Exception No. 1.

Circuits operating at less than 50 volts, that are not required to be grounded, shall be permitted to use conductors with green insulation or green with one or more yellow stripes for other than equipment grounding conductors.


Removing the exception eliminates an important allowance. Many standard multiconductor cables and flexible cords contain green colored insulated conductors that should be able to be used for other than equipment grounding conductors if the circuit is not grounded. Related Item First Revision No. 39-NFPA 79-2016 [Section No. 13.2.2.1]




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Statement: This action reinstates and revises Exception 1 that was removed in the First Revision Meeting. The revision addresses the concerns that low-energy equipment supplied from an ungrounded source should not place a restriction on the use of the green conductor in a multiconductor cable. The changes correlate with the language in Section 250.119 of NFPA 70 as directed by the CC. The changes provide necessary restrictions on use of green conductors to address the substantiation for removing the exception in FR 39.


13.2.2.1*

The color GREEN with or without one or more YELLOW stripes shall be used to identify the equipment grounding conductor where insulated or covered. This color identification shall be strictly reserved for the equipment grounding conductor. GREEN shall be the predominant color when used in combination with one or more YELLOW stripes.

Exception No. 1: It shall be permitted to use conductors of any color, provided the insulation or cover is appropriately identified at all points of access. Exception No. 2: For grounded control circuits, use of a GREEN insulated conductor with or without one or more YELLOW stripes or a bare conductor from the transformer terminal to a grounding terminal on the control panel shall be permitted.




NOTE: This Public Comment appeared as CC Note No. 4 in the First Draft Report on First Revision No. 39, and is also related to Public Input Nos. 118 & 190. The Correlating Committee directs the committee to give further consideration to the negative comments expressed in voting on FR 39 for consistency with the National Electrical Code. This action will be considered as a public comment. Related Item First Revision No. 39-NFPA 79-2016 [Section No. 13.2.2.1]






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CommitteeStatement:

The Correlating Committee directs the committee to give further consideration to thenegative comments expressed in voting on FR 39 for consistency with the NationalElectrical Code.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.


1 of 2 11/9/2016 1:10 PM

Holub, Richard A.


Kovacik, John R.

Manche, Alan


Pierce, James F.



2 of 2 11/9/2016 1:10 PM

Committee Statement

Committee Action:





13.2.2.1*

The color GREEN with or without one or more YELLOW stripes shall be used to identify the equipment grounding conductor where insulated or covered. This color identification shall be strictly reserved for the equipment grounding conductor. GREEN shall be the predominant color when used in combination with one or more YELLOW stripes.

Exception No. 1:1: In multiconductor cable-connected assemblies where equipment grounding is not required, the solid color GREEN shall be permitted for other than equipment grounding. Exception No. 2: It shall be permitted to use conductors of any color, provided the insulation or cover is appropriately identified at all points of access. Exception No. 23: For grounded control circuits, use of a GREEN insulated conductor with or without one or more YELLOW stripes or a bare conductor from the transformer terminal to a grounding terminal on the control panel shall be permitted.


The proposed text restores the Exception in the 2015 Version which is often used for low voltage equipment that is not required to be grounded. A similar exception is found in NEC 250.119 Exception 1 which permits the use of green for other than equipment grounding. See comment 69 for related definition of equipment not required to be grounded. Related Item First Revision No. 39-NFPA 79-2016 [Section No. 13.2.2.1]




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13.4.5 Attachment Plug and Receptacle (Plug/Socket) Combinations. 13.4.5.1

Where equipment is removable, connections to it through a polarized attachment plug and receptacle (plug/socket) combination shall be permitted. With power on the system, there shall be no shock hazard present on the exposed male pins of either part of an unplugged attachment plug and receptacle (plug/socket) combination.

13.4.5.2

Attachment plug and receptacle (plug/socket) combinations shall be listed for the intended use and shall be of the locking type where rated greater than 20 amperes. Where used on circuits of more than 300 volts to ground or 300 volts phase-to-phase, they shall be skirted and constructed to contain any arc generated when a connection is made or broken.

13.4.5.3

Attachment plug and receptacle (plug/socket) combinations shall be designed so that both of the following occur:

(1) The equipment grounding circuit connection is made before any current-carrying connections are made.

(2) The equipment grounding circuit connection is not disconnected until all current-carrying connections in the plug are disconnected.

Exception: Connections used in PELV circuits or the connectors used only to facilitate assembling and disassembling (multipole connectors) shall not be required to meet these requirements. 13.4.5.4

Attachment plug and receptacle (plug/socket) combinations used for carrying motor loads shall meet the conditions of 5.3.3.2 if the circuit is likely to be opened under load.

13.4.5.5

Where more than one attachment plug and receptacle (plug/socket) combination is used at the same location, they shall be mechanically coded or be clearly identified to prevent incorrect insertion.

13.4.5.6

Attachment plug and receptacle (plug/socket) combinations that are used for industrial power purposes or of a type used for domestic applications shall not be used for control circuits.

13.4.5.7

Means shall be provided to cover externally mounted receptacles (socket) when the plugs are removed.






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13.4.6 Dismantling for Shipment.

Where it is necessary that wiring be disconnected for shipment and where practicable, terminals or attachment plug and receptacle (plug/socket) combinations shall be provided at the sectional points. Such terminals shall be suitably enclosed and attachment plug and receptacle (plug/socket) combinations shall be protected from the physical environment during transportation and storage. Raceway and enclosure openings shall be sealed prior to shipment. With power on the system, there shall be no shock hazard present on the exposed male pins of either part of an unplugged attachment plug and receptacle (plug/socket) combination.






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14.8 Direction Arrow.

Where reverse rotation produces an unsafe condition or causes damage to connected equipment, a direction arrow shall be installed. The arrow shall be adjacent to the motor and plainly visibleand visible.


Using the term “plainly” before “visible” does not help with enforcing or interpreting a visibility requirement nor does it add any clarity to the requirement. Whether something is “visible” can only be judged on the specific application. The term “plainly” should be removed before “visible” throughout the Standard. Related Item First Revision No. 10-NFPA 79-2016 [New Section after 3.3.106]




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Committee Action:

Accepted


Statement: Using the term “plainly” before “visible” does not help with enforcing or interpreting a visibility requirement nor does it add any clarity to the requirement. Whether something is “visible” can only be judged based on the specific application.


14.10 Motor Controllers

Motor controllers shall be provided in accordance with Article 430, Part VII, of NFPA 70.


Presently specific guidance on selecting motor controllers is missing in NFPA 79. Motor overload protection is specified to be provided using NEC Article 430, Part III in 7.3.1. Transformer protection is required to be provided using NEC Article 450, Part IV in 7.2.7. Motor controllers should have a similar reference other than 1.5 Related Item First Revision No. 46-NFPA 79-2016 [Section No. 15.1.1]




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Accepted


Statement: Presently, specific guidance on selecting motor controllers is missing in NFPA 79. Motor overload protection is specified to be provided using Article 430 of NFPA 70, Part III in NFPA 79 7.3.1. Transformer protection is required to be provided using NEC Article 450, Part IV in NFPA 79 7.2.7. Motor controllers should have a similar more specific reference other than NFPA 79 1.5 which sends you back to NFPA 70.


15.1.1 Receptacles for Accessory Equipment.

Where the machine or its associated equipment is provided with receptacle outlets to be used for accessory equipment (e.g., handheld power tools, test equipment), the following conditions shall apply:

(1) Receptacles mounted externally or internally to the enclosure shall be ground-fault circuit-interrupter (GFCI)–protected.

(2) Receptacles shall be supplied from a grounded 120-volt ac source.

(3) Receptacles shall be of the parallel blade grounding type, 125-volt, single-phase, 15- or 20-ampere configuration and listed for the applied voltage.

(4) Receptacles with their associated attachment plugs (plug/sockets) shall be in accordance with 13.4.5.3.

(5) The continuity of the equipment grounding circuit to the receptacle outlet shall be verified by Section 18.2.

Exception: Verification is not required for PELV circuits in accordance with Section 18.2.

(6) All ungrounded (unearthed) conductors connected to the receptacle outlet shall be protected against overcurrent in accordance with the provisions of 7.2.5, and these circuits shall not be connected to other machine circuits.

(7) Where the power supply to the receptacle outlet is not disconnected by the supply disconnecting device for the machine or section of the machine, the safety sign requirements of 5.3.5.4 shall apply.

(8) Receptacles shall be suitable for the environment,and those mounted external to the enclosure and subject to dirt, dust, oil, or other contaminants shall be provided with a means to cover the receptacle when the plug is removed.






Affilliation: TG2

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Committee Action:




Public Comment No. 70-NFPA 79-2016 [ Sections 15.1.1, 15.1.2 ]

Sections 15.1.1, 15.1.2 15.1.1 Receptacles for Accessory Equipment.

Where the machine or its associated equipment is provided with receptacle outlets to be used for accessory equipment (e.g., handheld power tools, test equipment), the following conditions shall apply:

(1) Receptacles mounted externally or internally to the enclosure shall be ground-fault circuit-interrupter (GFCI)–protected.

(2) Receptacles shall be supplied from a grounded 120-volt ac source.

(3) Receptacles shall be of the parallel blade grounding type, 125-volt, single-phase, 15- or 20-ampere configuration and listed for the applied voltage.

(4) Receptacles with their associated attachment plugs (plug/sockets) shall be in accordance with 13.4.5.3.

(5) The continuity of the equipment grounding circuit to the receptacle outlet shall be verified by Section 18.2.

Exception: Verification is not required for PELV circuits in accordance with Section 18.2.

(6) All ungrounded (unearthed) conductors connected to the receptacle outlet shall be protected against overcurrent in accordance with the provisions of 7.2.5, and these circuits shall not be connected to other machine circuits.

(7) Where the power supply to the receptacle outlet is not disconnected by the supply disconnecting device for the machine or section of the machine, the safety sign requirements of 5.3.5.4 shall apply.

(8) Receptacles shall be suitable for the environment,and those mounted external to the enclosure and subject to dirt, dust, oil, or other contaminants shall be provided with a means to cover the receptacle when the plug is removed.

15.1.2 Receptacles for Maintenance Personnel.

Receptacles that are part of the industrial machine, either internal or external to the control cabinet and intended for use by maintenance personnel, shall have ground-fault circuit-interrupter (GFCI) protection for personnel.


The change in 15.1 GFCI requirements has resulted in 15.2 being unnecessary and causing confusion. 15.1 refers to accessory equipment such as "power tools" and "test equipment" which are typically used by maintenance personnel. Related Item First Revision No. 46-NFPA 79-2016 [Section No. 15.1.1]




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Rejected

Resolution: The change in 15.1.1 GFCI requirements has not resulted in 15.1.2 being unnecessary and causing confusion.


16.2.2

Safety signs shall be plainly visible on the enclosure door or cover.






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16.2.3.1

The marking shall be located so as to be plainly visible be visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment.






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16.4.1

Control equipment shall be legibly and durably marked in a way that is plainly visible after the equipment is installed. A nameplate giving the following information shall be attached to the outside of the enclosure, or on the machine immediately adjacent to the enclosure:

(1) Name or trademark of supplier

(2) Model, serial number, or other designation

(3) *Rated voltage, number of phases and frequency (if ac), and full-load current for each supply

(4) Ampere rating of the largest motor or load

(5) Maximum ampere rating of the short-circuit and ground-fault protective device, where provided

(6) Short-circuit current rating of the industrial control panel

(7) Electrical diagram number(s) or the number of the index to the electrical drawings






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16.4.2

The full-load current shown on the nameplate shall not be less than the full-load currents for all motors and other equipment that can be in operation at the same time under normal conditions of use, design load, and duty cycle. Where unusual loads or duty cycles require oversized conductors, the required capacity shall be included in the full-load current specified on the nameplate.


The proposed text addresses the concerns expressed in PI 113 without always requiring measurement of input current. Related Item Public Input No. 113-NFPA 79-2016 [Section No. 16.4.2]




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Committee Statement

Committee Action:

Accepted


Statement: The proposed text addresses the concerns expressed in PI 113 without always requiring measurement of input current.


16.4.4

Where only a single motor or motor controller is used, the motor nameplate shall be permitted to serve as the electrical equipment nameplate where it is plainly visibleis visible.






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Accepted



Public Comment No. 85-NFPA 79-2016 [ Sections 18, 18 ]

Sections 18, 18 Chapter 18 Testing and Verification 18.1* General.

The verification of the continuity of the equipment grounding circuit effective ground fault current path shall be conducted and documented. When the electrical equipment is modified, the requirements in Section 18.7 shall apply. Applicable tests shall be performed where deemed necessary in accordance with the references in the following list:

(1) Verification that the electrical equipment is in compliance with the technical documentation (see Chapter 17)

(2) Insulation resistance test (see Section 18.3)

(3) Voltage test (see Section 18.4)

(4) Protection against residual voltages test (see Section 18.5)

(5) Functional test (see Section 18.6)

18.2* Continuity of the Equipment Grounding Circuit.the Effective Ground Fault Current Path

One of the following methods shall be used to verify the continuity of the equipment grounding circuit effective ground fault current path :

(1) Use an impedance measuring device, take into account any impedance in the measuring circuit. The measured impedance shall be 0.1 ohm or less.

(2) Apply a current of at least 10 amperes, 50 Hz or 60 Hz, derived from a SELV source. The tests are to be made between the equipment grounding terminal and relevant points that are part of the equipment grounding circuit; the

measured voltage between the equipment grounding terminal and the points of test is not to exceed the values given in Table 18.2.

Table 18.2 Verification of Continuity of the Equipment Grounding Circuit

Minimum Equipment Grounding Conductor Cross-Sectional Area of the Branch Under Test

.

(AWG)

Maximum Measured

.

Voltage Drop* .

(V) 18 3.3

16 2.6

14 1.9

12 1.7

10 1.4

>8 1.0

*Values are given for a test current of 10 amperes.

18.3 Insulation Resistance Tests.

The insulation resistance measured at 500 volts dc between the power circuit conductors and the equipment grounding circuit effective ground fault current path shall not be less than 1 megohm. The test shall be permitted to be made on individual sections of the machine.

18.4* Voltage Tests.

The machine shall withstand without breakdown a test voltage gradually applied from 0 to 1500 volts ac or 2121 volts dc and held at the maximum value for a period of at least 1 second between the conductors of all primary circuits and the equipment grounding circuit effective ground fault current path . The test voltage shall be supplied from an isolated power supply with a minimum rating of 500 volt amperes. Components that are not rated to withstand the test voltage shall be disconnected during testing.

18.5 Protection Against Residual Voltages.

Residual voltage tests shall be performed to ensure compliance with Section 6.5.

18.6 Functional Tests.

The functions of electrical equipment, particularly those related to safety and safeguarding, shall be tested.

18.7 Retesting.

Where a portion of the machine and its associated equipment is changed or modified, that portion shall be reverified and retested as appropriate.

Chapter 18 Testing and Verification 18.1* General.

The verification of the continuity of the equipment grounding circuit effective ground fault current path shall be conducted and documented. When the electrical equipment is modified, the requirements in Section 18.7 shall apply. Applicable tests shall be performed where deemed necessary in accordance with the references in the following list:

(1) Verification that the electrical equipment is in compliance with the technical documentation (see Chapter 17)

(2) Insulation resistance test (see Section 18.3)

(3) Voltage test (see Section 18.4)

(4) Protection against residual voltages test (see Section 18.5)

(5) Functional test (see Section 18.6)

18.2* Continuity of the Equipment Grounding Circuit Effective Ground Fault Current Path .

One of the following methods shall be used to verify the continuity of the equipment grounding circuit:

(1) Use an impedance measuring device, take into account any impedance in the measuring circuit. The measured impedance shall be 0.1 ohm or less.

(2) Apply a current of at least 10 amperes, 50 Hz or 60 Hz, derived from a SELV source. The tests are to be made between the equipment grounding terminal and relevant points that are part of the equipment grounding circuit

effective ground fault current path ; the measured voltage between the equipment grounding terminal and the points

of test is not to exceed the values given in Table 18.2.

Table 18.2 Verification of Continuity of the Equipment Grounding Circuit Effective Ground Fault Current Path

Minimum Equipment Grounding Conductor Cross-Sectional Area of the Branch Under Test

.

(AWG)

Maximum Measured

.

Voltage Drop* .

(V) 18 3.3

16 2.6

14 1.9

12 1.7

10 1.4

>8 1.0

*Values are given for a test current of 10 amperes.

18.3 Insulation Resistance Tests.

The insulation resistance measured at 500 volts dc between the power circuit conductors and the equipment grounding circuit shall not be less than 1 megohm. The test shall be permitted to be made on individual sections of the machine.

18.4* Voltage Tests.

The machine shall withstand without breakdown a test voltage gradually applied from 0 to 1500 volts ac or 2121 volts dc and held at the maximum value for a period of at least 1 second between the conductors of all primary circuits and the equipment grounding circuit effective ground fault current path . The test voltage shall be supplied from an isolated power supply with a minimum rating of 500 volt amperes. Components that are not rated to withstand the test voltage shall be disconnected during testing.

18.5 Protection Against Residual Voltages.

Residual voltage tests shall be performed to ensure compliance with Section 6.5.

18.6 Functional Tests.

The functions of electrical equipment, particularly those related to safety and safeguarding, shall be tested.

18.7 Retesting.

Where a portion of the machine and its associated equipment is changed or modified, that portion shall be reverified and retested as appropriate.


The changes in terms made in Chapter 8 during the first revision meeting with FR 29, placed the terminology in Chapter 18 in conflict. These changes make the document consistent. Related Item First Revision No. 29-NFPA 79-2016 [Section No. 8.2]



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Statement: The changes in terms made in Chapter 8 during the first revision meeting with FR 29, placed the terminology in Chapter 18 in conflict. These changes make the document consistent.

Public Comment No. 39-NFPA 79-2016 [ Section No. A.3.3.9 ]

A.3.3.9 Attachment Plug (Plug Cap) (Plug).

A plug/socket combination is a plug and socket outlet, a cable coupler, or an appliance coupler.


The linked image cannot be displayed. The file may have been moved, renamed, or deleted. Verify that the link points to the correct file and location.

Delete the explanation and the * by the section in the body of the standard. The IEC term and definition should be included in Annex J and should not be included here as an explanation for a non IEC term. TG2 Luis Bas - Chair; Paul Dobrowsky; Brett Imlah; Daleep Mohla; Dino Mariuz; Richard Trainor Related Item Public Input No. 144-NFPA 79-2016 [Section No. 3.3.91]




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Public Comment No. 53-NFPA 79-2016 [ Section No. A.3.3.82 ]

A.3.3.82 Receptacle.

A plug/socket combination is a plug and socket outlet, a cable coupler, or an appliance coupler.


Delete the explanation and the * by the section in the body of the standard. The IEC term and definition is already included in Annex J and should not be included here as an explanation for a non IEC term. TG2 Luis Bas - Chair; Paul Dobrowsky; Brett Imlah; Daleep Mohla; Dino Mariuz; Richard Trainor Related Item


Public Input No. 144-NFPA 79-2016 [Section No. 3.3.91]




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Public Comment No. 54-NFPA 79-2016 [ Section No. A.11.2.1.7 ]

A.11.2.1.7

For additional information on attachment plug and receptacle (plug/socket) combinations, see 13.4.5.







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Public Comment No. 43-NFPA 79-2016 [ Section No. D.1 ]

D.1

Figure D.1(a) through Figure D.1(q) are not intended to be (design) guidelines. They are included only to illustrate documentation methods.

Figure D.1(a) Cover Sheet and Sheet Index.

Figure D.1(b) System Layout and Installation Diagram.

Figure D.1(c) Block (System) Diagram.

Figure D.1(d) Interconnection Diagram.

Figure D.1(e) Elementary Schematic.

Figure D.1(f) PLC Input Diagram.

Figure D.1(g) PLC Output Diagram.

Figure D.1(h) Sample Enclosure Layout — Interior.

Figure D.1(i) Sample Enclosure Layout — Exterior.

Figure D.1(j) Sequence of Operations — Graphical.

Figure D.1(k) Sequence of Operations — Descriptive Graphical.

Figure D.1(l) Sample Servo Diagram.

Figure D.1(m) Sample PLC Network — Station Layout.

Figure D.1(n) Sample Operator Station.

Figure D.1(o) Sample Parts List.

Figure D.1(p) ISO (A2) Drawing Standard Framework.

Figure D.1(q) Selections from ANSI Y32.2/IEEE 315 Symbol Table.


FR 40. fig D1B Replace "duct" with "wireway" Duct is the wrong term to use. fig D1B Replace "duct" with "wiring channel" in three places Duct is the wrong term to use. Related Item First Revision No. 40-NFPA 79-2016 [Section No. 13.3.1]




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Statement: Delete the term "duct" and replace with "wireway" in D.1 b. The committee agreed to do this as indicated in the Committee Statement to FR 50 for the 2015 edition. The terms described do not always match the term they follow as many times they are not directly interchangeable. Annex J was added in the 2015 edition to help users understand the differences between terms used in other standards. Disregard the strikeouts.

Public Comment No. 57-NFPA 79-2016 [ Section No. D.1 ]

D.1

Figure D.1(a) through Figure D.1(q) are not intended to be (design) guidelines. They are included only to illustrate documentation methods.

Figure D.1(a) Cover Sheet and Sheet Index.

Figure D.1(b) System Layout and Installation Diagram.

Figure D.1(c) Block (System) Diagram.

Figure D.1(d) Interconnection Diagram.

Figure D.1(e) Elementary Schematic.

Figure D.1(f) PLC Input Diagram.

Figure D.1(g) PLC Output Diagram.

Figure D.1(h) Sample Enclosure Layout — Interior.

Figure D.1(i) Sample Enclosure Layout — Exterior.

Figure D.1(j) Sequence of Operations — Graphical.

Figure D.1(k) Sequence of Operations — Descriptive Graphical.

Figure D.1(l) Sample Servo Diagram.

Figure D.1(m) Sample PLC Network — Station Layout.

Figure D.1(n) Sample Operator Station.

Figure D.1(o) Sample Parts List.

Figure D.1(p) ISO (A2) Drawing Standard Framework.

Figure D.1(q) Selections from ANSI Y32.2/IEEE 315 Symbol Table.


File Name Description Approved Figure_D.1_b_-_1.docx Figure D.1(b) replaced Duct with Wireway






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Statement: Delete the term "duct" and replace with "wireway" in D.1 b. The committee agreed to do this as indicated in the Committee Statement to FR 50 for the 2015 edition. The terms described do not always match the term they follow as many times they are not directly interchangeable. Annex J was added in the 2015 edition to help users understand the differences between terms used in other standards. Disregard the strikeouts.

Public Comment No. 29-NFPA 79-2016 [ Section No. K.1 ]

K.1 Referenced Publications.

The documents or portions thereof listed in this annex are referenced within the informational sections of this standard and are not part of the requirements of this document unless also listed in Chapter 2 for other reasons.

K.1.1 NFPA Publications.

National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169-7471.

NFPA 70®, National Electrical Code®, 2017 edition.

wireway

NFPA 70E®, Standard for Electrical Safety in the Workplace®, 2015 edition.

NFPA 77, Recommended Practice on Static Electricity, 2014 edition.

K.1.2 Other Publications. K.1.2.1 ANSI Publications.

American National Standards Institute, Inc., 25 West 43rd Street, 4th Floor, New York, NY 10036.

ANSI B11.0, Safety of Machinery — General Requirements and Risk Assessment, 2010.

ANSI B11-TR4, Selection of Programmable Electronic Systems (PES/PLC) for Machine Tools, 2004.

ANSI B11-TR6, Safety Control Systems for Machine Tools, 2010.

ANSI Z535.4, Product Safety Signs and Labels, 2011.

K.1.2.2 CENELEC Publications.

CENELEC, European Committee for Electrotechnical Standardization , CENELEC Management Centre, Avenue Marnix 17,4th floor, B - 1000 Brussels.

BS EN 60204-1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements, corrigendum, 2010.

BS EN 61010-1, Safety requirements for electrical equipment for measurement, control, and laboratory use — Part 1: General requirements, 2010, corrigendum, 2011.

K.1.2.3 IEC Publications.

International Electrotechnical Commission, 3, rue de Varembé, P.O. Box 131, CH-1211 Geneva 20, Switzerland.

IEC 60034-1 Ed. 12.0, Rotating electrical machines — Part 1: Rating and performance, 2010.

IEC 60072-1 Ed. 6.0, Dimensions and output series for rotating electrical machines — Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080, 1991.

IEC 60204-1 Ed. 5.1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements, 2009.

IEC 60332-1-1 Ed. 1.1, Tests on electric and optical fibre cables under fire conditions — Part 1-1: Test for vertical flame propagation for a single insulated wire or cable apparatus, 2015.

IEC 60364-4-41 Ed. 5.0, Electrical installations of buildings — Part 4-41: Protection for safety — Protection against electric shock, 2005.

IEC 60364-5-53 Ed. 3.2, Electrical Installations of buildings — Part 5-53: Selection and erection of electricalequipment — Isolation, switching and control, 2015.

IEC 60417 DB [Database], Graphical symbols for use on equipment — Part 1: Overview and application, 2002.

IEC 60529 Ed. 2.2, Degrees of protection provided by enclosures (IP Code), 2013, corrigendum 2, 2015.

IEC 60621-3 Ed. 1.0, Electrical installations for outdoor sites under heavy conditions (including open-cast mines and quarries). — Part 3: General requirements for equipment and ancillaries, 1979 (withdrawn).

IEC 60742 Ed. 1.0, Isolating transformers and safety isolating transformers, 1983 (superseded by IEC 61558-1).

IEC 60870-5-1 Ed. 1.0, Telecontrol equipment and systems— Part 5: Transmission protocols — Section One: Transmission frame formats, 1990.

IEC 60947-4-1 Ed. 3.1, Low-voltage switchgear and controlgear — Part 4-1: Contactors and motor-starters— Electromechanical contactors and motor-starters, 2012.

IEC 60947-5-1 Ed. 3.1, Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and switching elements — Electromechanical control circuit devices, 2009.

IEC 60947-7-1 Ed. 3.0, Low-voltage switchgear and controlgear — Part 7-1: Ancillary equipment — Section 1: Terminal blocks for copper conductors, 2009.

IEC 61010-1 Ed. 3.0, Safety requirements for electrical equipment for measurement, control, and laboratory use — Part 1: General requirements, 2010.

IEC 61310-1 Ed. 2.0, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for visual, auditory and tactile signals, 2007.

IEC 61310-3 Ed. 2.0, Safety of machinery — Indication, marking and actuation — Part 3: Requirements for the location and operation of actuators, 2007.

IEC 61508 Ed. 2.0, [Series] Functional safety of electrical/electronic/programmable electronic safety-related systems, 2010.

IEC 61558-1 Ed. 2.1, Safety of power transformers, power supply units and similar — Part 1: General requirements and tests, 2011.

IEC 61800-5-2 Ed. 1.0, Adjustable speed electrical power drive systems — Part 5-2: Safety requirements — Functional, 2007.

IEC 62061 Ed. 1.2, Safety of machinery — Functional safety of electrical, electronic and programmable control systems, 2015, corrigendum 1, 2015.

NOTE: The IEC publishes consolidated editions of its publications with all the amendments and corrigenda included with the base document. For example:

Edition 1.0 is a base document without any amendments.

Edition 1.1 is the base 1.0 edition consolidated with one amendment.

Edition 1.2 is the base 1.0 edition consolidated with two amendments.

Edition 2.0 is the second edition of a base document. This may include new information combined as well as amendments from edition 1.x.

Edition 2.1 is the second edition of a document consolidated with amendment 1 to that edition.

K.1.2.4 IEEE Publications.

IEEE, 3 Park Avenue, 17th Floor, New York, NY 10016-5997.

IEEE 100 CD, The Authoritative Dictionary of IEEE Standard Terms, 2013.

ANSI Y32.2/IEEE 315, IEEE Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters), 1993.

IEEE 841, Petroleum and Chemical Industry — Premium-Efficiency, Severe-Duty, Totally Enclosed Fan-Cooled (TEFC) Squirrel Cage Induction Motors — Up to and Including 370 kW (500 hp), 2009.

K.1.2.5 ISO Publications.

International Organization for Standardization, ISO Central Secretariat, BIBC II, 8, Chemin de Blandonnet, CP 401, 1214 Vernier, Geneva, Switzerland.

ISO 7000, Graphical symbols for use on equipment — Registered symbols, 2014.

ISO 12100, Safety of machinery — General principles for design — Risk assessment and risk reduction, 2010.

ISO 13849-1, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design, 2006, corrigendum 1, 2009.

ISO 13849-2, Safety of machinery — Safety-related parts of control systems — Part 2: Validation, 2012.

ISO 13850, Safety of machinery — Emergency stop function — Principles for design, 2015.

K.1.2.6 NEMA Publications.

National Electrical Manufacturers Association, 1300 North 17th Street, Suite 900, Arlington, VA 22209.

NEMA MG-1, Motors and Generators, 2014.

NEMA 250, Enclosures for Electrical Equipment (1000 Volts Maximum), 2014.

K.1.2.7 SEMI Publications.

Semiconductor Equipment and Materials International, 3081 Zanker Road, San Jose, CA 95134.

SEMI S2, Environmental, Health, and Safety Guideline for Semiconductor Manufacturing Equipment, 2010.

SEMI S9, Safety Guideline for Electrical Design Verification Tests for Semiconductor Manufacturing Equipment, 2001 (withdrawn 2007).

SEMI S22, Safety Guideline for the Electrical Design of Semiconductor Manufacturing Equipment, 2010.

K.1.2.8 UL Publications.

Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062-2096.

UL 50, Standard for Enclosures for Electrical Equipment, 2007, revised 2015.

UL 62, Standard for Flexible Cord and Fixture Wire, 2010, revised 2014.

UL 248-14, Standard for Low-Voltage Fuses — Part 14: Supplemental Fuses, 2000, revised2015.

UL 489, Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, 2009, revised 2014.

UL 498, Standard for Attachment Plugs and Receptacles, 2012, revised2014.

UL 508, Standard for Industrial Control Equipment, 1999, revised2013.

UL 508A, Standard for Industrial Control Panels, 2001, revised2014.

UL 651, Standard for Schedule 40 and 80 , EB and A Rigid PVC Conduit and Fittings, 2011, revised2014.

UL 758, Appliance Wiring Material, 2014, revised2014.

UL 1004-1, Standard for Rotating Electrical Machines, 2012, revised2015.

UL 1077, Standard for Supplementary Protectors for Use in Electrical Equipment, 2005, revised2015.

UL 1682, Plugs, Receptacles, and Cable Connectors of the Pin and Sleeve Type,2013, revised 2013.

UL 60950-1, Information Technology Equipment — Part I: General Requirements, 2007, revised2014.

UL 2237 Outline, Outline of Investigation for Multi-Point Interconnection Power Cable Assemblies for Industrial Machinery, 2015.

IEC/UL 61010, Electrical Equipment for Measurement, Control and Laboratory Use — Part 1: General Requirements, 2014.

UL 61010-1, UL Standard for Safety Electrical Equipment For Measurement, Control, and Laboratory Use — Part 1: General Requirements, 2004, revised 2015.




NOTE: This Public Comment appeared as CC Note No. 7 in the First Draft Report on First Revision No. 64, and is also related to Public Input Nos. 2 & 115. The Correlating Committee directs the committee to give further consideration to the correct title of ANSI B11.0. This action will be considered as a public comment Related Item First Revision No. 64-NFPA 79-2016 [Chapter K]

Public Input No. 2-NFPA 79-2015 [Chapter K]

Public Input No. 115-NFPA 79-2016 [Section No. K.1.2.8]




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Committee Statement

Committee Action:



Statement: The TC updated edition dates and corrected the title of ANSI B11.0 which addressed the CC comments.

Correlating Committee Note No. 7-NFPA 79-2016 [ Chapter K ]



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CommitteeStatement:

The Correlating Committee directs the committee to give further consideration to thecorrect title of ANSI B11.0.


Ballot Results


12 Eligible Voters

1 Not Returned

11 Affirmative All



0 Abstention

Not Returned

Dressman, Kevin L.

Affirmative All

Brunssen, James E.


Hickman, Palmer L.

Hittinger, David L.

Holub, Richard A.



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Manche, Alan


Pierce, James F.



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Documents

Public Comment No. 73-NFPA 79-2016 [ Section No. 1.1.1 ... · Public Comment No. 73-NFPA 79-2016 [ Section No. 1.1.1 ] 1.1.1 The provisions of this standard shall apply to the electrical/electronic