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Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 1 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
1.0 Purpose
The purpose of this procedure is to give a step-by-step approach for single phase transformer-
rated residential metering installation and to briefly explain the hazards associated with the
process.
2.0 Scope
This procedure applies to single phase transformer-rated residential metering installations
utilizing either;
• an internal CT cabinet and external transformer-rated meter socket c/w test
switch
• an external 400 amp combination meter socket
.
3.0 General
Newfoundland Power will ensure personnel involved with the use of metering equipment are
adequately protected from the hazards associated with the utilization of this equipment.
4.0 Responsibilities
4.1 Supervisor responsible for the work shall:
• Ensure personnel are aware of the hazards associated with the utilization revenue
metering equipment.
• Ensure Risk Management/Job Planning (RM/JP) process is carried out prior to the
start of work.
• Ensure that all workers are aware of all related procedures. This would include, but
not be limited to:
• OPR104.01- Personal Protective Equipment
• OPR104.02 – Flame Resistant Clothing
• OPR106.42 – Management of Electrical Arc Hazards up to 750 Volts
• Worker Protection Code (WPC)
• Risk Management and Job Safety Planning Code
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 2 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
4.2 Worker
• Ensure the outcomes identified by the RM/JP process are in place prior to starting
work.
• Many new installations are done at locations where construction is in progress.
Personnel should pay close attention to their environment and beware of additional
hazards that result from working at these locations.
5.0 Procedure:
Internal CT Cabinet With External Transformer-Rated Meter Socket
Figure 1 – CT cabinet and Disconnect cabinet
5.1 Pre-Installation
5.1.1 The Meter Technician should ensure that all personal protective equipment
(including flame resistant clothing, hard hat with face shield, safety glasses,
Balaclava if required, class “zero” rubber gloves and correct safety boots) is worn
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 3 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
before proceeding with installation.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 4 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
5.1.2 Ensure that the main switch blades are in the open position and check the
disconnect for potential reading using the voltmeter. The reading on the
voltmeter should be 0 volts.
Figure 3 – Main Switch blades in open position Figure 4 - Testing for potential on Disconnect
5.1.3 After testing for potential, lock the disconnect cabinet and place the “Do Not
Operate” Lockout tag on the lock as per OPR 300.14 Equipment Lockout.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 5 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
Figure 5 - Do Not Operate Lockout Tag
5.2 Metering Installation
5.2.1 Meter Bypass Socket Side
5.2.1.1 Remove the protective cover on the meter holder and pass the
installation cable through the hole in the CT cabinet out the meter
bypass socket.
Figure 6 – Installation cable
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 6 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
5.2.1.2 Using duct seal, seal the hole where the installation cable passed through
the meter bypass socket or LB, to prevent water from entering the CT
cabinet.
Figure 7 – Apply duct seal
5.2.1.3 Make the phase connections on the meter bypass side as per the
Newfoundland Power wiring standards.
Figure 8 – Complete phase connections
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 7 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
5.2.1.4 Ensure that the connections are tightly secured.
5.2.1.5 Apply Penetrox to the jaws of the meter bypass socket, install the meter
socket cover and slide the meter in place.
Figure 9 – Applying Penetrox
5.2.1.5 Install the meter band and apply the tamper-sensitive seal to the tip of
clamp.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 8 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
Figure 10 - Applying the meter cover and NP tamper-restrictive seal
5.2.2 CT Cabinet Side
5.2.2.1 Make the ground connection to CT cabinet ground.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 9 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
Figure 11 – Ground connection
5.2.2.2 Make the polarity connections on the CT side as per the Newfoundland
Power wiring standards (x1 – polarity, x2 – return).
Figure 12 – Polarity connections.
Figure 13 - Showing all connection points.
5.2.2.3 Ensure that the connections are tightly secured.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 10 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
5.2.2.4 Torque the connection points of the CT line and load.
Figure 14 - Torque the connection
5.2.2.5 Cover the CT with the transparent plastic guard and place a tamper-
resistive seal over the top of the guard.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 11 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
Figure 15 - Plastic guard and tamper-resistive seal
5.3 Concluding the Job
5.3.1 Record the CT ratio and the current rating of the disconnect.
5.3.2 Record the meter, serial, and seal lock numbers.
5.3.4 Complete Metering Installation Form
5.3.5 Attach the seal sticker and seal lock to the cover of the CT and disconnect
cabinets and record the number printed on the seal lock.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 12 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
Figure 16 - Apply the NP seal lock and stickers.
6.0 400 Amp Combination Meter Socket
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 13 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
Figure 14 – 400 Amp Combination Meter Socket Cabinet
6.1 Pre-Installation
6.1.1 The Meter Technician should ensure that all personal protective
equipment (including flame resistant clothing, hard hat with face
shield, safety glasses, class “zero” rubber gloves, balaclava if
required, and correct safety boots) is worn before proceeding with
installation.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 14 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
6.1.2 Ensure that the main switch blades are in the open position and check the
disconnect for potential reading using the voltmeter. The reading on the
voltmeter should be 0 volts.
Figure 15 – Main Switch blades in open position Figure 16 - Testing for potential on Disconnect
6.1.3 After testing for potential, lock the disconnect cabinet and place the “Do Not
Operate” tag on the lock. Also verify that the service conductors have not been
energized at the line side by NP personnel.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 15 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
Figure 17 - Do Not Operate Tag
6.2 Metering Installation
6.2.2 Secondary Wiring
6.2.2.1 Remove the protective covers on the meter socket & lower cabinet and
inspect the factory-installed secondary conductors.
Figure 18 – Secondary Conductors - Test Switch
Figure 19 – Secondary Conductors – CT
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 16 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
Figure 20 – Secondary Conductors – Meter Socket
6.2.2.2 Verify that all secondary connections are secure and wired as per NP
standards from the CT secondary location to test switch and from test
switch to meter socket.
6.2.2.3 Remove the inspection certificate from the 3-wire CT and note details
for creation of the CT in MES.
6.2.2.4 Apply Penetrox to the jaws of the meter socket, install the meter socket
cover and insert the meter.
6.2.2.5 Place tamper-resistive seals on the transparent plastic guard cover on the
CT and test switch cover.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 17 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
Figure 21 - Plastic guards and tamper-resistive seals
6.2.2.6 Ensure that the manufacturer supplied plastic Flash Sheild is
properly installed between the socket buss bars and the metering
test switch.
Figure 22 – Plastic Flash Shield Placement
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 18 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
6.2.2.7 Attach the seal sticker and padlock seal to the lower cabinet door
and record the number printed on the padlock seal
Figure 23 - NP tamper-restrictive seals – Meter Band & Cabinet
6.3 Concluding the Job
6.3.1 Record the current rating of the disconnect.
6.3.2 Record the meter, serial, and seal lock numbers.
6.3.4 Complete Metering Installation Form
6.3.5 Attach the seal sticker and seal lock to the disconnect cabinet and record the
number printed on the padlock seal.
Bulletin Number: OPR111.06
Date Issued: 2011 08 25
Date Revised: 2016 08 16
Date Reviewed: 2019 09 12
Page 19 of 17
New Transformer-Rated Metering Installation
Created By: B. Chubbs /B. Styles Reviewed By: R. Murdoch
Revised By: B. Styles Approved By: J. Curran
______________________________________________________________________________
7.0 Reference
7.1 Reference Documents
• OPR104.01- Personal Protective Equipment
• OPR104.02 – Flame Resistant Clothing
• OPR106.42 – Management of Electrical Arc Hazards up to 750 Volts
• OPR 300.14 Equipment Lockout
• Worker Protection Code (WPC)
• Risk Management and Job Safety Planning Code
7.2 Related Hazards
7.3 Legal and Other Requirements
• Occupational Health and Safety Regulations
8.0 Records
• No records
9.0 Glossary
• RM/JP – Risk Management/Job Planning
• CT – Current Transformer
• LB – L Shaped 90 degree conduit with access point
