CERTIFICATION IMPACT ANALYSIS: (UL) IEC 60950-1, EDITION ... · in the end product. Added to allow the component supply chain to begin requesting use of IEC 62368-1 before their end

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CERTIFICATION IMPACT ANALYSIS:

(UL) IEC 60950-1, EDITION No. 2, AMENDMENT No. 2

Safety of Information Technology Equipment

Technical Editor: Thomas M. Burke

Principal Engineer – ICT, Consumer Technology Division

UL LLC

This analysis is intended to identify and analyze the impact of notable differences between

the latest versions of the IEC and UL standards for Safety of Information Technology

Equipment (ITE) and their predecessors. In particular, the Second Amendment to IEC

60950-1 Second Edition is being analyzed and compared to its predecessors, mainly IEC

60950-1 Second Edition, Amendment No. 1 and UL 60950-1 Second Edition.

Amendment No. 2 to IEC 60950-1 Second Edition was published in May 2013. The

corresponding revisions to CSA CC2.2 No. 60950-1/UL 60950-1, Second Edition, were

published on October 14, 2014, and this Analysis also includes analysis of any changes to

the National Differences associated with the latest bi-national standard.

This Analysis also will make note of any new Common and Special National Conditions

associated with EN 60950-1:2006/A1:2010/A2:2013 (August 2014) that are

considered noteworthy due to potential impact on global products. (To date, non-have been

identified specifically associated with A2.)

This analysis will permit persons already familiar with IEC 60950-1 and UL 60950-1 to

become familiar with the likely impact on ITE of the latest IEC and UL ITE Safety Standards.

Other select observations are included that may be of interest to the reader. This analysis

will be updated as additional information on the application of the new Standards becomes

known.

One key thing to keep in mind is that IEC TC108 has made a commitment to limit further

revision of IEC 60950-1 and concentrate its work and effort on IEC 62368-1,

Audio/video, information and communication technology equipment – Part 1:

Safety requirements, the Standard that eventually will replace IEC 60065 (AV Equipment)

and IEC 60950-1 (ICT Equipment). (Edition No. 2 of IEC 62368-1 was published in February

2014.) Therefore, most of these changes in Amendment No. 2 were adopted to allow for

continued effective application of IEC 60950-1 during the transition.

Background

IEC 60950-1 is the International Standard for Safety of Information Technology Equipment.

It encompasses under its scope information technology equipment, communication

technology equipment, office appliances and multi-media equipment for use in the home,

office, business, school, computer room and similar locations.

IEC 60950-1 is developed/maintained by IEC Technical Committee (TC) 108, Maintenance

Team No. 2 (MT2): Safety and Energy Efficiency of Information Technology Equipment.



IEC TC 108 also is responsible for,

• IEC 60950-21, Information technology equipment – Safety – Part 21: Remote power

feeding;

• IEC 60950-22, Safety of Information Technology Equipment – Part 22: Equipment

Installed Outdoors;

• IEC 60950-23, Safety of Information Technology Equipment – Part 23: Large Data

Storage Equipment;

• IEC 60990, Methods of Measurement of Touch Current and Protective Conductor

Current;

• IEC 62151, Safety of Equipment Electrically Connected to a Telecommunication

Network;

• IEC/TR 62102, Electrical Safety - Classification of Interfaces for Equipment to be

Connected to Information Technology and Communications Technology Networks; and

• IEC/TS 62367 – Safety aspects for xDSL signals on circuits connected to

telecommunication networks.

In the U.S. and Canada, the current ITE Bi-National Standard (BNS), formally designated

CSA C22.2 No. 60950-1/UL 60950-1, Second Edition, is based on the Second Edition of IEC

60950-1, including Amendment Nos. 1 and 2. Like its predecessors includes U.S./Canadian

deviations (National Differences) to address needed national requirements that are not in

the base IEC document.

The technical content of the BNS is developed and maintained by the Technical

Harmonization Committee (THC), Maintenance Team No. 2 (MT2), which consists of

representation from UL, CSA, and several U.S. and Canadian IT and communication

technology equipment industry groups.

The Effective Date for UL 60950-1 Second Edition is outlined on the UL website -

http://industries.ul.com/blog/effective-date-information/.

Notes to this Analysis:

• Unless otherwise noted, all Sub-clause/Annex references are to the Amendment No. 2 of

IEC 60950-1, Edition No. 2.

• Discussion of changes and differences associated with Amendment No. 2 to IEC 60950-

1, Second Edition is in plain text.

• Discussion of new or revised national differences specifically associated with October 14,

2014 revisions of the Bi-National Standard, CSA C22.2 No. 60950-1/UL 60950-1,

Second Edition are noted, CAN/U.S. ND.

• Discussion of new or revised special national conditions (differences) associated with

CENELEC EN 60950-1:2006/A1:2010/A2:2013 are noted, CENELEC ND.

Explanation of Impact Statements: Statement Impact

None Anticipate no impact on the present certification

practice of most ITE due to the change.

Minor* Anticipate limited impact on the present

certification practice of some, or all ITE due to the

change.

Considerable* Anticipate considerable impact on the present

certification practice of some, or all ITE due to the

change.



* For new/revised requirements that are considered at this time more onerous than

existing requirements, the Impact Statement (Minor, Considerable) will be followed by a

(+). For new/revised requirements that are considered at this time less onerous than

existing requirements, the Impact Statement (Minor, Considerable) will be followed by a (-).

No symbol next to a Minor statement indicates that, although there could be limited impact

associated with the change, it is indeterminate whether it will be slightly more or less.

Revision History:

November 1, 2013: Modifications to entries on:

• 2.6.2, Functional Earthing,

• 4.4.5, Protection against moving fan blades, and

• Annex Q, VDRs.

August 15, 2014:

• Update to include National Differences (ND) associated with CSA/UL 60950-1, Ed 2,

Am 2.

• Update to include special national conditions (differences) associated with CENELEC

EN 60950-1:2006/A1:2010/ A2:2013

January 16, 2015:

• Update to reflect publication of revisions to CSA/UL 60950-1, Ed. No. 2, dated

October 14, 2014.



Clause 0 (General Principles of Safety)

Sub-clause Discussion Impact

0.1

General Principles of Safety

Adds the term “components”

to the principle that

technologies and methods of

construction that are not

anticipated by the Standard

can be investigated if they

meet a similar level of safety

as described in the

principles.

None. Informative. See

1.5.1.

Clause 1 (General)


1.1.1

Equipment Covered by this

Standard

Reformats third paragraph,

and adds material that

indicates that external power

supply units and accessories

intended for use with ITE are

covered under the scope of

the Standard.

Clarification added because

there are other IEC power

supply standards that can

apply to external power

supplies and IEC TC108

wanted to make clear that

IEC 60950-1 is the

appropriate standard for

such power supplies used

with ITE.

None. Reflects present

practice.

1.1.3

Exclusions

Distribution transformers:

Clarifies that “distribution”

transformers are excluded

from the scope of IEC

60950-1.


practice.

CAN/U.S. ND Battery back-up systems:

Clarifies that battery backup

systems that are not an

integral part of Stationary

Equipment, typically

provided in separate

cabinets, are subjected to

the appropriate standard for

the battery backup systems.

Provided as the primary

reference is the standard for

Batteries for Use in Light

Electric Rail (LER)


practice.



Clause 1 (General)


Applications and Stationary

Applications, UL

1973.

This National Difference was

necessary because a new

class of independent electric

energy storage systems

(EESS) are becoming

popular, often interfacing

with uninterruptible power

supplies (UPS) or distributed

energy systems (e.g., PV),

and this Standard in not

intended to cover such

equipment.

1.2.1.1

Rated Voltage

Editorially modifies the

definition of “rated voltage.”

Removes unneeded

information on three phase.

None. Editorial. Reflects

present practice.

1.5.1

Components - General

Editorially modifies general

statement about

consideration of components.

None. Editorial. Reflects

present practice.

Adds new sub-clause that

components and

subassemblies that comply

with IEC 62368-1 may be

used in equipment

investigated to this standard

without further evaluation

other than to give

consideration to the

appropriate use of the

component or subassembly

in the end product.

Added to allow the

component supply chain to

begin requesting use of IEC

62368-1 before their end

product customers select IEC

62368-1.

A similar statement is being

added to IEC 60065.

Minor (-). Since limited

components have been

certified to IEC 62368-1 to

date, limited impact.

However, very beneficial

development in the scope of

the overall longer term

transition to IEC 62368-1.

1.5.2

Evaluation and Testing of

Components

Editorial modification of the

legacy component

requirement provisions to

better clarify the intent of

IEC TC108.

Minor (-). Generally, reflects

present practice.



Clause 1 (General)


1.5.6

Capacitors Bridging

Insulation

Editorially modifies

specifications for relative

humidity to better align with

the IEC style guide.

None. Editorial.

Continuing with modifications

made in Amendment 1, adds

further detail to Table 1C

and the accompanying Rules

to closer align with IEC

62368-1 and work done to

update the requirements for

capacitors. During the last

set of Amendment 1

revisions, some needed

details were left out which

made the requirements

incomplete and difficult to

apply.

Minor. Aligns with IEC

62368-1. Generally reflects

present practice, although

there could be some impact

as different practices by

different manufacturers and

NCBs are driven to closer

alignment.

1.5.7.2

Resistors Bridging Double

Insulation or Reinforced

Insulation Between the a.c.

Mains Supply and Other

Circuits





None. Editorial.

1.5.9.2

Protection of VDRs

Adds compliance criteria

related to determination as

to whether or not there is a

Limited Current Circuit.

Correlates compliance

criteria with existing

requirement.


practice.

1.5.9.4

Bridging of Basic Insulation

by VDR

Clarifies requirements for

use of VDRs and GDTs in

series that aligns with the

parallel revisions being made

to IEC 62368-1 that resulted

from some task group work

within the IEC TC108 HBSDT

(108/441/INF).

However, only addresses

VDRs and GDTs bridging

Basic Insulation. Does not

address such constructions

bridging Double or

Reinforced Insulation, which

requires further study.

Minor. Aligns with IEC

62368-1. Generally reflects






alignment.



Clause 1 (General)


1.7

Markings and Instructions

Removes incorrect reference

to 2.1.1.8, Energy Hazards,

since there is no marking in

this sub-clause.

None. Editorial.

1.7.1.1

Power Rating Markings

Clarifies application of power

rating markings, specifically

for equipment with multiple

connections to mains,

including an example

marking format for such

markings.

Minor. Generally reflects






alignment.

1.7.1.3

Use of Graphical Symbols

New sub-clause, which takes

the existing last paragraph in

1.7.1.1 and moves it into its

own sub-clause.

Includes new reference to

ISO 3864-2, and states that

when symbols are used, they

should also be explained in

the user manual.

Minor (+). Generally reflects






alignment.

1.7.2.1

Safety Instructions and

Marking – General

CENELEC ND

In Denmark, Finland,

Norway and Sweden, for

CLASS I PLUGGABLE

EQUIPMENT

TYPE A intended for

connection to other

equipment or a network, if

safety relies on

connection to protective

earth or if surge suppressors

are connected between the

network terminals and

accessible parts, requires a

marking stating that the

equipment must be

connected to an earthed

mains socket-outlet.

Minor (+). Potentially a new

marking required for some

equipment.

1.7.5

Power Outlets on the

Equipment

CENELEC ND

In Denmark, socket-outlets

for providing power to other

equipment shall be in

accordance with the DS

60884-2-D1:2011.

Minor (+). Expected to

generally reflect present

practice.



Clause 2 (Protection from Hazards)


2.2.3

Voltages under Fault

Conditions

Further modifies the

requirements for SELV

circuits to try to better

accommodate ‘hiccup’ mode

with periodic pulses, in

particular during fault

conditions.

The changes include

replacing previous references

to “120 V d.c.” with “120

Vpeak”, and replacing the

existing Figure 2E with a

more descriptive set of

figures, Figure 2E.1 and

2E.2.

These changes were made to

accommodate the bridge

between 60950-1 and

62368-1 since IEC 62368-1

treats the subject differently

and it is anticipated some of

the same interpretation

issues will be simplified/

addressed in 62368-1.







alignment.

2.5

Limited Power Sources

In Table 2B, Limits for power

source without an OCPD, the

‘note d’ for measurement of

Isc and S are modified for

PTC devices to allow a 60s

measurement instead of 5s.

This change was added since

some of the PTC devices

used in ITE would trip too

soon under the 5s criteria,

considering the need to

accommodate Tma and the

fact that PTC devices are

temperature dependent.

Minor (-). Provides

manufacturers with a little

more flexibility selecting and

designing PTC protection into

LPS.

2.6.2

Functional Earthing

A new symbol has been

added to IEC 60417: IEC

60417-6092, Class II

equipment with functional

earthing (grounding).

It is the intent of IEC TC108

that this symbol is to (shall)

be used with equipment

Minor (+). New marking for

some equipment. Provides

manufacturers with a clearer

marking requirement for

identifying ITE with

functional earthing. Only

impacts a small number of

manufacturers.





incorporating functional

earthing.

Key is that the traditional

double insulation symbol is

not permitted to be marked

on such equipment.

At the March 2013 meeting

of TC108, TC108 decided to

modify the wording in the

FDIS for IEC 60065 and

62368-1 to reflect the above

intent. However, since IEC

60950-1 had already passed

FDIS, the formal changes

were not allowed in it, but an

INF is planned to clarify the

current intent of IEC TC108

for IEC 60950-1.

CAN/U.S. ND As indicated above, it is the

intent of IEC TC108 that the

new symbol for functional

earthing should be provided

on such equipment

incorporating functional

earthing. The National

Difference in 2.6.2 allows for

CSA/UL 60950-1 to reflect

the IEC TC108 position, and

also aligns with the latest

versions of IEC 60065 and

IEC 62368-1.

Minor (+). New marking for

some equipment. Provides

manufacturers with a clearer

marking requirement for

identifying ITE with

functional earthing. Change

only impacts a small number

of manufacturers.

2.6.3.3

Size of Protective Bonding

Conductors

Table 2D, Minimum size of

protective bonding

conductors, has been

modified to correlate with

some work done on IEC

62368-1 to more closely

align standard values in the

table to better accommodate

both European and North

American electrical supply

systems and infrastructure.

Minor (-). Provides

manufacturers with more

flexibility designing

protective bonding systems

into global products.





CAN/U.S. ND As described above, since

Table 2D and other parts of

sub-clause 2.6.3 have been

modified to better

accommodate North

American electrical supply

systems, several previous

NDs in the table and sub-

clause have been removed or

modified.


practice.

2.7.1

Basic Requirements

An ‘in some countries’ Note

adds China to the existing

reference to CENELEC

regarding countries/regions

that require protection per

5.3 to be incorporated into

the equipment.

None. In some countries

note. Reflects present

practice.

2.9.2

Humidity Conditioning





None. Editorial.

Adds humidity conditioning

parameters for equipment

designed for use in tropical

conditions.


present practice due to

existing requirements in

national standards.

2.9.3

Grade of Insulation

In Table H, corrects some of

the references to conditions

that are appropriate to some

of the entries.


present practice.

2.10.3.1

General

Adds an ‘in some countries’

note for China that China

considers altitude

adjustment over 2000 m.

None, for IEC. Country only

consideration.

2.10.3.3

Clearances in Primary

Circuits

Table 2L is modified, mainly

to include information on

correlation of clearances at

higher working voltages.


present practice.

2.10.10

Test for Pollution Degree 1

Environment and for

Insulating Compound

Clarification that for printed

boards, it is not required to

section (slice open) the

board to determine

compliance with 2.10.5.5.

This change was championed

by UL since it was

determined to be impractical

to section printed boards.

Minor (-). Allows for a more

practical application of the

requirements for Pollution

Degree 1 for printed boards.





2.10.11

Tests for Semiconductor

Devices and for Cemented

Joints

Clarification added that for

printed boards only, it is not

required to section the board

to determine compliance.

Visual inspection, combined

with electric strength, is

adequate. This change was

championed by UL since it

was determined to be

impractical to section printed

boards.

Minor (-). Allows for a more

practical application of the

requirements for Pollution

Degree 1 for printed boards.

Clause 3 (Wiring, Connections and Supply)


3.2.1.1

Connection to AC Mains

Supply

CENELEC ND

In Denmark, supply cords of

single-phase equipment

having a rated current not

exceeding 13 A shall be

provided with a plug

according to DS 60884-2-D1.

CLASS I EQUIPMENT

provided with socket-outlets

with earth contacts or which

are intended to be used in

locations where protection

against indirect contact is

required according to the

wiring rules shall be provided

with a plug in accordance

with standard sheet DK 2-1a

or DK 2-5a.

If a single-phase equipment

having a RATED CURRENT

exceeding 13 A or if a

polyphase equipment is

provided with a supply cord

with a plug, this plug shall be

in accordance with the

standard sheets DK 6-1a in

DS 60884-2-D1 or EN

60309-2.

Minor. Expected to generally

reflect present practice.

3.2.5.1

AC Power Supply Cords

Editorial modification, and

clarification of requirements

for use of screened cords in

Moveable Equipment.


present practice.



Clause 3 (Wiring, Connections and Supply)


Also adds a provision that

other cords not specified

may be used if they have

similar or better electro-

mechanical and fire safety

properties.

3.3.5

Wiring Terminal Sizes

Table 3E is reformatted, with

additional modification to

accommodate use of cords

with equipment having rated

current up to 80 A. Also,

addition of new column that

includes information on

conductor size.

Also, new ‘note c’ provides

alternative to the

requirements of this table for

accommodation of special

connectors (e.g., closed

loop) and appropriate

adjustment of terminal sizes.

Minor (-). Provides


flexibility designing terminals

for mains supply and

protective earthing

conductors.

3.4.11

Multiple Power Sources

Adds clarification anticipating

that some equipment may

not have a disconnect device

in the equipment. Therefore,

the marking requiring

instructions on how to

remove all power from the

equipment is to be located

close to the mains input

terminals. Also, see 1.7.1.1.


present practice.

Clause 4 (Physical Requirements)


4.1

Stability

Provides an additional

compliance option for the

application of the 10 degree

tilt test, which is allowed

now in IEC 62368-1 and that

better accommodates some

modern configurations of ITE

Minor (-). Provides


flexibility designing and

testing equipment for

compliance with the 10

degree tilt test.

4.2.11

Rotating Solid Media

Although not indicated in the

Amendment, the August

2012 Corrigendum 1 for

Amendment No. 1 of IEC

60950-1, Edition 2 removed

sub-clause 4.2.11 from

None. The sub-clause

already has been removed

from Amendment No. 1,

although it might not be

obvious unless one is aware

of the August 2012





Amendment 1. Therefore, it

also is no longer in

Amendment No. 2.

Corrigendum.

4.3.8

Batteries

IEC TC108 made a

commitment to the IECEE to

add a reference to IEC 62133

once the Standard was

revised (Edition 2) to

incorporate some needed

changes. As a result, there

now is a reference in 60950-

1 to IEC 62133 for portable

secondary sealed cells and

batteries (other than button)

containing alkaline or other

non-acid electrolyte, which

includes Lithium-Ion.

Additionally, the first

paragraph was editorially

revised, and the first

compliance criteria for

overcharging of a

rechargeable battery was

modified to reflect some of

the work done on IEC

62368-1 to make a more

realistic test condition.

Considerable (+). Although

the other changes are

relatively minor, the addition

of the requirement that

portable secondary sealed

cells and batteries need to

comply with IEC 62133 could

have some considerable

impact on manufacturers

who in the past used IEC

60950-1 alone for such

batteries and battery packs.

In the U.S. and Canada,

since for a number of years

there has been a National

Difference requiring UL 2054

for most of these same types

of batteries, and since UL

2054 and IEC 62133 while

not harmonized have a

number of common features,

the impact on manufacturers

likely will be less.

CAN/U.S. ND Battery Packs

(transportable

equipment): An existing

National Difference in Annex

P.1 for secondary

rechargeable batteries in

transportable equipment

references UL 2054.

However, Amendment 2 of

IEC 60950-1 Ed 2 now

references IEC 62133, Ed 2

for the same batteries.

For the transition to IEC

62133 in IEC 62368-1, the

addition of IEC 62133 was

combined with

expansion of the

performance requirements

for battery packs in Annex M.

However, for IEC 60950-1,

Ed 2, Am 2, the

Minor. Since UL 2054 is

presently required, and

remains an option, there is

no impact on secondary

battery packs used in

transportable equipment

maintaining use of UL 2054

for such battery packs.

For manufacturers

transitioning to IEC 62133,

there may be some minor

impact (+) since it involves

determining compliance with

another standard (IEC

62133) and Annex M of IEC

62368-1.





requirements in 4.3.8 were

not significantly expanded to

cover the additional aspects

in Annex M of IEC 62368-1.

Since UL 2054 has proven

effective in CSA/UL 60950-1

for many years, for

transitional purposes until UL

62368-1 is fully

implemented, battery packs

used in transportable

applications are required to

comply with either, (a) the

UL 2054 component

requirement (Annex P.1), or

(b) IEC 62133 combined with

the additional requirements

from Annex M of IEC 62368-

1. This will allow for a better

transition to IEC 62133 for

battery packs during the

60950-1 to 62368-1

transition.

CAN/U.S. ND Battery Packs (stationary

equipment): For stationary

applications, internationally

IEC TC21/SC21A continues

work on IEC 62619, Safety

requirements for secondary

lithium cells and batteries for

use in industrial applications.

IEC 62619 will cover battery

packs and subsystems for

stationary applications, with

IEC 62133 still covering

portable applications.

However, IEC 62619 likely

will not be published for 2-3

more years.

In the U.S., for stationary

applications the standard, UL

1973, Batteries for Use in

Light Electric Rail (LER)

Applications and Stationary

Applications, often is being

used to consider the safety

of larger and more complex

and powerful electric energy

storage systems (EESS).

Efforts are beginning to

Minor (+). Large battery

packs with Lithium Ion and

other modern chemistries

have not been used

frequently in stationary

applications until relatively

recently. While compliance

with a battery safety

standard technically is a new

requirement under 60950-1,

allowing three options until

IEC 62619 is published is not

considered likely to be a

significant impact on the

present design of such

battery packs for use in

stationary applications.





make it a bi-national

standard for both Canada

and the U.S., and longer

term, there is an intent to

make UL 1973 and IEC

62619 harmonized.

However, in the interim,

battery packs with secondary

sealed cells and batteries

containing alkaline or other

non-acid electrolyte and

used in Stationary

Equipment have the option

to comply with either IEC

62133, UL 2054 or UL 1973.

CAN/U.S. ND Insulation in Battery

Packs:

Both IEC 62133 and UL 2054

do not contain detailed

requirements for

electrical insulation. As

lithium-ion and other more

complex battery subsystems

are incorporated into

stationary equipment, there

is increased likelihood they

may incorporate Hazardous

Voltages, thus will require

application of appropriate

insulation requirements

when the insulation is used

as a safeguard.

A requirement has been

added to make clear that

appropriate requirements

from sub-clause 2.10

(Clearances, creepage

distances and distances

through insulation) should be

applied to such safeguards in

battery packs when a battery

standard does not have such

requirements.


present practice for battery

packs utilizing Hazardous

Voltages.

4.4.5

Protection Against Moving

Fan Blades

Sub-clause 4.5.5 has been

restructured and rewritten to

more clearly cover the fan

blade requirements that

were added to IEC 60950-1

Minor (-). Modifications

should promote intended

application.





in Amendment No. 1 of

Edition No. 2. There were

some unintended

implications related to how

the requirements were being

applied, so additional

clarifications were needed.

4.7.3.4

Materials for Components

and other Parts Inside Fire

Enclosures

Since existing Annex Q for

VDRs references IEC 61051-

2 and since Annex Q now

has VDR flammability

requirements, a reference to

Annex Q has been added in

4.7.3.4.

None. Editorial.

Clause 5 (Electrical Requirements and Simulated Abnormal Conditions)


5.2.2

Test Procedure

Table 5C has been revised to

provide more realistic test

voltages for Reinforced

Insulation

Minor (-). Since Table 5C

now allows for smaller test

voltages for some Reinforced

Insulation, manufacturers will

be able to design accordingly.

Clause 6 (Connection to Telecommunication Networks)


6.2.2

Electric Strength Test

Procedure

Editorial modification of in

some country note for

Australia.

None. Informative note.

Clause 7 (Connection to Cable Distribution Systems)


7.4.1

General

Now allows for similar

protection of TNV-1 circuits

in 7.4.1 as is currently

allowed in 7.3, and therefore

such circuits do not need to

be subjected to voltage

surge test in 7.4.2 or

impulse test in 7.4.3.

Mainly, for the exception to

apply, the circuit must be

Considerable (-). Provides

additional design options for

equipment connected to the

cable distribution network

and involving SELV voltage

levels and that are intended

to be earthed on the

secondary side.



Clause 7 (Connection to Cable Distribution Systems)


TNV-1, the earthed side of

the circuit must be

connected to the coaxial

cable screen, and the

installation instructions

require the coaxial cable to

be connected to the building

installation.

7.4.3

Impulse Test

For equipment required to

be tested, the 4kV impulse

test is not required if the

electrical separation already

has been tested at 3 kV or

4.242 KV peak or d.c. in

accordance with 5.2.2.

The testing per 5.2.2 is

considered representative of

the testing per 7.4.3 and the

statement reduces

redundant testing.

Minor (-). Provides for

reduced testing of circuits

that are already required to

be tested by other

requirements in the

Standard.

Annexes

Discussion Impact

Annex B

Motor Tests Under

Abnormal Conditions

B.7.2

Test Procedure

Since the requirements in

B.7.2 are for a secondary

motor, compliance criteria

also now permits either a

winding to open or the

permanent de-energization

to terminate testing

Also, editorially modifies

sub-clause to split

requirement and compliance

criteria.

Minor (-). Generally reflects

present practice.

B.7.3

Alternate Test Procedure

Since the requirements in

B.7.3 are for a secondary

motor, also permits either a

winding to open or the

permanent de-energization

to terminate testing.

Minor (-). Generally reflects

present practice.



Annexes

Discussion Impact

Annex D

Measuring Instruments

for Touch-Current Tests

D.1

Measuring Instrument

For Figure D.1, revises lower

end of frequency range

specification for the

measurement meter from 15

Hz to 20 Hz. This was done

for accreditation purposes

and to be more aligned with

IEC 60990.

Minor. Most equipment is

expected to continue to

comply.

Annex F

Measurement of

Clearances and Creepage

Distances

Provides some additional

clarification on Figure F.8,

Narrow recess, and Figure

F.9, Wide recess, in

particular intended

application of both

clearances and creepage

distances. Clearances were

missing previously

None. Editorial.

Annex P

Normative References


existing introductory

material to better explain the

intent of the Annex, in

particular that the standards

only apply as referenced in

the body of the Standard.

They are not intended to be

general references for

certification purposes.

Also includes specific

standards, or updated

standards, now references in

Am 2 that may not have

been referenced before, such

as IEC 62133 for batteries.

None. Introduction provides

intent of the Annex and

new/updated standards are

part of requirements in the

body of the Standard.

Annex P.1

UL and CSA Component

Requirements

(mandatory)

(3.2.1.2, 3.2.4, 3.2.5.2)

DC Rated Attachment Plugs

Annex P.1 has been updated

to include a reference to the

recently published, SU 2695

Minor (+). Requirement only


manufacturers.



Annexes

Discussion Impact

CAN/U.S. ND Outline for DC Rated

Attachment Plugs and Outlet

Devices Intended for Use

with Information Technology

and Telecommunications

Equipment Installed in

Restricted Access

Locations.

(4.3.6, 3.2.5)

Direct Plug-in units

CAN/U.S. ND

The requirements for use of

mounting tabs on direct

plug-in units/ equipment

(DPIU) differ in Canada and

the U.S.

Sub-clause 7.15 of UL 1310

limits the use of a mounting

tab to applications that

certain specified conditions

are met. A marking

requirement (7.15 (d) and

52.4) addresses the

concerns with a mounting

tab and the potential ‘risk of

electric shock’ associated

with the ordinary person

(user) removing the

receptacle cover screw.

CSA C22.2 No. 223 has a

more conservative

requirement that restricts

use of mounting tabs for

general use power supplies

investigated to it. The CSA

223 requirement is based on

an interpretation of the

Canadian Electrical Code.

Therefore, for ITE

applications, and so

manufacturers can ship

single systems of equipment

(e.g., DPIU and Class III

device) to both Canada and

the U.S., a modified

requirement permits

manufacturers to take into

consideration the installation

requirements in both Canada

and the U.S. without having

to provide separate

Minor (+). Requirement only


manufactures. Although

manufacturers will be

required to provide an

additional marking, the

added provision will permit

single systems (equipment

and DPIU) to be shipped into

Canada and the U.S.

See associated marking in

NAA (4.3.6, 3.2.5).



Annexes

Discussion Impact

DPIUs/systems for each

country.

Annex P.2

UL and CSA Component

Requirements

(Alternative)

CAN/U.S. ND

Several updates to

referenced standards have

been made to Annex P.2.

None. Editorial.

Annex Q

Voltage Dependent

Resistors (VDRs)

Although the existing Annex

Q references IEC 61051-2 for

VDRs, there is some

information missing that is

needed to determine

whether the VDR meets

specifically an ITE

application. As part of the

work on IEC 62368-1 this

additional detail has been

identified and added to

Edition No. 2 of IEC 62368-

1, so now it is being added

to IEC 60950-1 to allow for

more effective use of Annex

Q.

Includes new requirement

that VDR case/enclosure

needs to comply with IEC

60695-11-5 Needle Flame or

V-1.

Considerable (+). Because

the previous Annex Q was

lacking detail, there may be

some impact on

manufacturers who may

have previously specified

VDRs that do not meet the

updated criteria. It is likely

that manufacturers will be

able to specify VDRs that

meet these criteria, but there

remains some uncertainty on

true impact at this time,

including the provision for

flammability of the VDR

body.

Annex U

Insulated Winding Wires

for Use without

Interleaved Insulation

Multi-layer winding wires for

use in transformers without

interleaved insulation are

decreasing in diameter, and

now include round wires with

diameters down to 0.01 mm,

stranded, solid square and

solid rectangular with cross-

sectional areas down to

0.000079 mm2. As a result,

Annex U needed modification

to include appropriate

requirements and references

Minor (-). Provides


flexibility designing and

testing multi-layer winding

wire for compliance with

Annex U.



Annexes

Discussion Impact

to appropriate component

standards for such

construction. The entire

Annex U has been rewritten

to accomplish this.

Annex Y

Ultraviolet Light

Conditioning Test





None. Editorial.

Annex CC

Evaluation of Integrated

Circuit (IC) Current

Limiters

- -

CC.1

Integrated Circuit (IC)

Current Limiters

As an implementation of sub-

clause 2.5 and LPS, the

current limit is stipulated to

be 5 A after each of the test

conditions (in CC.2, CC.3 or

CC.4).

The requirement now also

stipulates a different sample

may be used for each test.

Minor (+). Although the

existing CC.1 indicates the

manufacturer’s specified

value is limited to 5 A under

normal operating conditions,

this limit also now is

stipulated for conditioning

tests.

CC.2

Test Program 1

Several adjustments have

been made to the circuit

parameters.

Minor. The changes are not

expected to impact the

ability of components to

comply with the

requirements.

CC.3

Test Program 2

Provides clarification on the

fuse used to comply with the

test.

Minor. The changes are not

expected to impact the


comply with the

requirements.

CC.4

Test Program 3

IEC 62368-1 allows for a

third test program for

qualifying IC Current

Limiters, which actually is a

combination of the existing

test programs 1 and 2. To

allow for transition from IEC

60950-1 to IEC 62368-1, it

now also has been added to

Annex CC.

Minor (-). Allows

manufacturers more options

designing, testing and

selecting IC Current Limiters.

CC.5

Compliance

Since it was originally

missing, common compliance

criteria has been added that

is applicable to all three test

Minor (+). The changes are

not expected to impact the


comply with the



Annexes

Discussion Impact

programs.

requirements.

Annex NAE

U.S. and Canadian

Regulatory Requirements

1.1.2

Baby Monitors

CAN/U.S. ND

In the U.S. ASTM F2951,

Consumer Safety

Specification for Baby

Monitors, has been published

since the last Amendment.

The purpose of the

specification is to help avoid

strangulation hazards

associated with baby

monitors when the

equipment is mounted close

to the child. The associated

requirements, primarily,

instructional safeguards

/markings, are applicable to

baby monitors investigated

to the Standard.


present practice when baby

monitors are submitted for

investigation to this

standard. Only impacts a

very limited amount of

equipment.

1.1.3

Modular Data Centers

CAN/U.S. ND

Specifies that Modular Data

Centers (MDC) shall comply

with Article 646, Modular

Data Centers, of the National

Electrical Code, ANSI/NFPA

70, as covered in UL Subject

2755, Outline of

Investigation for Modular

Data Centers.

Minor. Redirects such

equipment to the more

appropriate standard.

2.6

Isolated Ground Receptacles

CAN/U.S. ND

Occasionally, Isolated

Ground Receptacles are

incorporated into ITE for

special purpose installations.

Clarifies, that when

incorporated into the

equipment, Isolated Ground

Receptacles are required to

be of a type identified for the

purpose (orange triangle

marked on the face of the

receptacle) and are required

to be installed in accordance

with the Grounding and

Bonding requirements in

Section 250.146(D),

Isolated Receptacles, of

NFPA 70 (NEC).

Minor (+). Reflects general

practice by nature of Clause

1 already requiring

equipment investigated to UL

60950-1 to be compatible

with the NEC.



Annexes

Discussion Impact

Also, clarifies, that metal

parts of the equipment shall

be separately protectively

earthed in accordance with

2.6, including use of

appropriate identification

symbols as required.

4.7.3.1

Equipment for use in spaces

used for environmental air

(plenums)

CAN/U.S. ND


requirements for equipment

used in spaces used for

environmental air, which the

NEC now classifies as a

plenum. See NAA (4.7.3.1)

for sample marking

Minor (+). An editorial

modification, but marking

may need to incorporate

slight modifications to reflect

the updated terminology. .

Documents

CERTIFICATION IMPACT ANALYSIS: (UL) IEC 60950-1, EDITION ... · in the end product. Added to allow the component supply chain to begin requesting use of IEC 62368-1 before their end