Qulliq Energy Corporation
(Part 2: Transformer – Connected Metering)
Commercial & Industrial
Revenue Metering Standards
Section 1
General Information
The information contained in this section is given to aid Corporation employees and
customers comply with the Standard Metering Requirements for the various types of
services offered by the Qulliq Energy Corporation to its customers.
Any questions by employees or customers concerning these Standards should be directed
to the Iqaluit Meter Shop for clarification.
Address:
Iqaluit Meter Shop
Federal Road
P.O. Box 250
Iqaluit, NU
X0A 0H0
Phone:
Fax:
Email:
867-979-7504
867-975-2610
bkim@NPC.NU.CA
Section 1
Commercial & Industrial Metering Guide
Table of Contents
Section 1 Customer Metering Standards
6.0 Services Requiring Instrument Transformer Meters
6.1 Scope
6.2 Supply of Metering Equipment
6.3 Meter Cabinets
6.4 Instrument Transformer Cabinets
6.5 Conduit Requirements
6.6 Meter Types
6.7 Metering Equipment Location
6.8 Mounting & Connection of Metering Equipment
6.9 Single Phase Requirements
6.10 Network Requirements
6.11 Three Phase Requirements
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Section 1 - Page 2
Commercial & Industrial Metering Guide
Appendices
A. Cabinet Sizes
Table 1
Table 2
Instrument Transformer Cabinet
Meter Cabinet
Page 9
Page 9
C. Instrument Transformer Connections
Figure 2
Figure 3
Figure 4
Figure 5a
Figure 5b
Single Phase, 3 Wire
2 Phase, Network
3 Phase, 3 Wire Delta
Phase, 4 Wire Wye over 200 Amp
3 Phase, 4 Wire Wye over 208 Volt
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D. Typical Service Installations
Figure 3 Instrument Transformer Metering
Page 15
Section 1 - Page 3
Commercial & Industrial Metering Guide
Qulliq Energy Corporation
Revenue Metering Standards
6.0
Services Requiring Instrument Transformer Meters
6.1
Scope
Metering Transformers shall be used to meter all services where the main switch
exceeds 200 Amperes or the voltage exceeds 250 Volts, and shall be installed in
approved metal enclosures on the load side of the main switch.
6.2
Supply of Metering Equipment
The Qulliq Energy Corporation shall supply all revenue meters, test blocks,
secondary wiring and associated equipment unless otherwise stated.
The Qulliq Energy Corporation will supply metering transformers. The customer
shall be responsible for their installation and primary connection.
The Qulliq Energy Corporation will deliver metering transformers to the job site
or at the request of the contractor arrangements will be made to ship them to the
Switchboard Manufacturer’s Plant.
The customer shall supply the meter cabinet, the instrument transformer cabinet,
the interconnecting conduit between the cabinets and all hardware, bus work,
termination and / or cable required for the primary connections to the current
transformers.
6.3
Meter Cabinets
A separate meter cabinet shall be provided for each service requiring instrument
transformer type metering.
Meter cabinets shall be made of sheet steel of a minimum of 16 gauge, and be
constructed in accordance with the appropriate CSA Specifications, and be of a
minimum size as designated in Appendix A, Table 1.
If meter cabinet is installed outside of the buildings by the customer, meter
cabinet should be weatherproof.
All meter cabinets shall be equipped with a sheet steel, removable, interiormounting panel of a minimum of 12 gauge.
Section 1 - Page 4
Commercial & Industrial Metering Guide
Meter cabinets shall be equipped with hinged doors that are not removable when
in the closed position. The doors shall be equipped with a latch or latch handle
combination. Provision shall be made for securing the doors with the Qulliq
Energy Corporation padlock or seal.
6.4
Instrument Transformer Cabinets
A separate instrument transformer cabinet shall be provided for each metering
circuit.
The instrument transformer cabinet shall be made of sheet steel and be
constructed in accordance with the appropriate CSA Specifications. Minimum
dimensions and metal gauges shall be as outlined in Appendix A, Table 1.
All instrument transformer cabinets shall be equipped with a sheet steel,
removable, interior-mounting panel of a minimum of 12 gauge.
The instrument transformer cabinet shall be equipped with vertically hinged doors
that are non-removable when in the closed position. These doors shall have
provision for the attachment of the Qulliq Energy Corporation padlock or seal in
the form of sealing tabs, hasps or sealing screws.
6.5
Conduit Requirements
A metal conduit of not less than 3cm nominal diameter for the exclusive use of
the Qulliq Energy Corporation shall be installed between the instrument
transformer cabinet and the meter cabinet. The conduit shall be terminated with
lock nuts and bushings, except where threaded hubs are supplied. No LB’s or
similar conduit fittings, which allow access to the metering circuits, shall be
allowed except when a CSA approved sealable “L” fitting is used. If such fittings
are used they must be clearly visible.
When it is necessary to route revenue metering secondary wires through
compartments other than those reserved for the Qulliq Energy Corporation, a
conduit or suitable metal raceway shall be installed through such compartments
for the exclusive use of the Qulliq Energy Corporation.
6.6
Meter Types
Bottom-connected meters will be used on all services.
6.7
Metering Equipment Location (See Appendix D)
The meter and metering equipment shall be installed as near as practical to the
main switch.
Section 1 - Page 5
Commercial & Industrial Metering Guide
(i) For a transformer vault, where the Qulliq Energy Corporation supplies
transformers, the customer shall provide secondary metering cabinet as near as
practical to the vault and on the load side of the main switch.
(ii) For Pole, structure, or pad mounted transformers the metering equipment shall
normally be located indoors on the load side of the main switch. However an
outdoors-weatherproof cubicle may be installed by the customer at a mutually
acceptable location to accommodate the metering transformers and the meter. A
metal compartment (Refer to the outlined in Appendix A) minimum with barriers
shall be provided in or on the cubicle to isolate the revenue meter. A removable
hinged metal back shall be provided in the meter compartment. The cubicle and
compartment shall be equipped with hinged doors and pad-locking facilities. The
doors shall have at least 15cm of clearance from the concrete base. The cubicle
shall be equipped with three point latching. A minimum 3cm-wire way shall be
provided between the meter and the instrument transformer compartment.
The Qulliq Energy Corporation will consider where feasible and at the request of
the customer metering on the primary side of transformation.
On both single and 3-Phase services an instrument transformer cabinet shall be
provided by the customer according to Appendix A, Table 1.
On both single and 3-Phase services, a meter cabinet shall be provided by the
customer according to Appendix A, Table 2.
The instrument transformer cabinet and the meter cabinet shall be interconnected
with a 3cm conduit having a maximum length of 8m.
The meter location shall be not less than 1.6m or more than 1.8m above the
finished floor. (Measurement to the meter face)
The meter cabinet must be level on the horizontal and vertical planes.
All equipment must be located in a clean, readily accessible area free from severe
or continual vibration.
6.8
Mounting and Connection of Metering Equipment
The customer will be responsible for mounting all cabinets and conduit, current
and potential instrument transformers, making all primary connections to the
current transformers and other equipment required for the Qulliq Energy
Corporation revenue metering.
Section 1 - Page 6
Commercial & Industrial Metering Guide
The Qulliq Energy Corporation will be responsible for mounting and connection
of the meter itself, all secondary wiring and primary wiring to the potential
transformers where required.
6.9
Single Phase Requirements
6.9.1 Single Phase, 2 Wire Requirements
The Qulliq Energy Corporation will supply the instrument transformers. The
transformers will be installed in a metal cabinet on the load side of the main
switch. Installation of the transformers and the primary connection of the current
transformer shall be the responsibility of the customer.
The grounded conductor shall be terminated in the instrument transformer
compartment on an insulated terminal block complete with a 30-ampere screw
lug.
See Appendix C, Figure 1
6.9.2 Single Phase, 3 Wire Requirements
A 3-wire current transformer will be supplied by the Qulliq Energy Corporation
and installed in a metal cabinet on the load side of the main switch. Installation
and primary connection of the current transformer shall be the responsibility of
the customer. For this type of service, no connection block is required for the
neutral conductor.
See Appendix C, Figure 2.
6.10
Network Requirements
The Qulliq Energy Corporation will supply the instrument transformers to the
customer. The instrument transformers shall be installed in a metal cabinet on the
load side of the main switch.
Installation of the instrument transformers and the primary connection of the
instrument transformers shall be the responsibility of the customer.
The neutral conductor shall be terminated in the instrument transformer
compartment on an insulated terminal block complete with a 30-ampere screw
lug.
See Appendix C, Figure 3.
6.11
Three Phase Requirements
6.11.1 Ungrounded Delta Services
Section 1 - Page 7
Commercial & Industrial Metering Guide
The Qulliq Energy Corporation will supply the instrument transformers to the
customer. The instrument transformers shall be installed in a metal cabinet on the
load side of the main switch.
Installation of the instrument transformers and the primary connection of the
instrument transformers shall be the responsibility of the customer.
The phase – B or centre phase conductor shall be terminated in the instrument
transformer compartment on an insulated terminal block complete with a 30ampere screw lug.
See Appendix C, Figure 4.
6.11.2 Wye Connected Services
The Qulliq Energy Corporation will supply the instrument transformers to the
customer. The instrument transformers shall be installed in a metal cabinet on the
load side of the main switch.
Installation of the instrument transformers and the primary connection of the
instrument transformers shall be the responsibility of the customer.
The neutral conductor shall be terminated in the instrument transformer
compartment on an insulated terminal block complete with a 30-ampere screw
lug.
On services where the appropriate neutral bus or conductor does not pass through
the instrument transformer compartment a copper or aluminum bus (2cm X 32mm
minimum) shall be extended from the system neutral conductor or bus into the
instrument transformer compartment. A 30-ampere screw lug shall be provided on
the bus in the instrument transformer compartment.
See Appendix C, Figure 5.
6.11.3 Four Wire Delta Connected Services
The Qulliq Energy Corporation will supply the instrument transformers to the
customer. The instrument transformers shall be installed in a metal cabinet on the
load side of the main switch.
Installation of the instrument transformers and the primary connection of the
instrument transformers shall be the responsibility of the customer.
The neutral conductor shall be terminated in the instrument transformer
compartment on an insulated terminal block complete with a 30-ampere screw
lug.
On services where the appropriate neutral bus or conductor does not pass through
the instrument transformer compartment a copper or aluminum bus (2cm X 32mm
minimum) shall be extended from the system neutral conductor or bus into the
instrument transformer compartment. A 30-ampere screw lug shall be provided
on the bus in the instrument transformer compartment.
See Appendix C, Figure 6.
Section 1 - Page 8
Commercial & Industrial Metering Guide
Appendix A
Table 1
Instrument Transformer Cabinet Sizes
Ampacity
Single Phase
Three Phase
H
W
D
H
W
D
Up to 400 Amp
610mm
24”
610mm
24”
254mm
10”
760mm
30”
760mm
30”
254mm
10”
401 to 600 Amp
760mm
30”
760mm
30”
254mm
10”
760mm
30”
760mm
30”
254mm
10”
601 to 1200 Amp
N/A
N/A
N/A
915mm
36”
915mm
36”
305mm
12”
Over 1200 Amp
N/A
N/A
N/A
1220mm 1220mm
48”
48”
305mm
12”
Table 2
Meter Cabinet Size
Minimum Size
H
W
D
685mm
27”
330mm
13”
254mm
10”
Section 1 - Page 9
Commercial & Industrial Metering Guide
Appendix C, Figure 2
Line
Instrument Transformer Cabinet
30 mm Conduit to Meter Cabinet
Line 1
Line 2
CT
Neutral
Load
Qulliq Energy Corporation
120/240 Volt Single Phase, 3 Wire Service
with Instrument Transformer
Section 1 - Page 10
Commercial & Industrial Metering Guide
Appendix C, Figure 3
A
B
C
Line
Instrument Transformer Cabinet
30 mm Conduit to Meter Cabinet
CT's
Neutral
Load
Insulated Neutral Block
Qulliq Energy Corporation
120/208 Volt, 3 Wire, Network Service
with Instrument Transformers
Section 1 - Page 11
Commercial & Industrial Metering Guide
Appendix C, Figure 4
A
Please Note
Line Phase Sequence does not effect metering
This service is conditionally available
B
C
Line
Instrument Transformer Cabinet
Sec.
Sec.
Prim.
Prim.
30 mm Conduit to Meter Cabinet
PT's
CT's
Load
Insulated Block
Qulliq Energy Corporation
3 Phase, 3 Wire, (Ungrounded) Delta Service over 250 Volt
with Instrument Transformers
Section 1 - Page 12
Commercial & Industrial Metering Guide
Appendix C, Figure 5a
A
Line Phase Sequence does not effect metering
B
C
Line
Instrument Transformer Cabinet
30 mm Conduit to Meter Cabinet
CT's
Load
Neutral
Insulated Neutral Block
Qulliq Energy Corporation
120/208 Volt, 3 Phase, 4 Wire, Wye Service over 200 Amp
with Instrument Transformers
Section 1 - Page 13
Commercial & Industrial Metering Guide
Appendix C, Figure 5b
A
Line Phase Sequence does not effect metering
B
C
Line
Instrument Transformer Cabinet
Sec.
Sec.
Sec.
Prim.
Prim.
Prim.
30 mm Conduit to Meter Cabinet
PT's
CT's
Load
Neutral
Insulated Neutral Block
Qulliq Energy Corporation
3 Phase, 4 Wire, Wye Service over 208 Volt
with Instrument Transformers
Section 1 - Page 14
Commercial & Industrial Metering Guide
Appendix D, Figure 3
Main Switch, Instrument Transformer Cabinet
and Meter Cabinet must have provision for
Qulliq Energy Corporation Sealing
Conduit Requirements See Section 6.5
Conduit Length See Section 6.7
Instrument Transformer Cabinet Requirements
See Section 6.4
For Size See Appendix A, Table 1
Meter Cabinet Requirements See
Section 6.3
For Size See Appendix A, Table 2
Meter Cabinet
Insrument Transformer Cabinet
Plastic
Bushings
Splitter Box
1.6 m – 1.8 m
Main
Switch
CL
Cover of Splitter Box must be hinged to
open downwards
Floor or Finished Grade
Qulliq Energy Corporation
Typical Instrument Transformer
Metering Installation
Section 1 - Page 15