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ELECTRICITY METERING FOR MEDIUM- AND HIGH-VOLTAGE INSTALLATIONS

FOREWORD AND TECHNICAL APPROVAL

The conditions governing the supply of electricity are established by Bylaw 634, in compliance with the amendments adopted on February 3, 2003 by the Régie de l'énergie du Québec. Standard F. 22-01, Electricity Metering for Medium- and High-Voltage Installations, issues from Bylaw 634 and Hydro-Québec guidelines. This document corresponds to the 3rd French edition of Standard F. 22-01, published by Hydro-Québec to inform employees, master electricians, consulting engineers and manufacturers about the requirements and conditions governing the metering of medium- and high-voltage electricity. It is also meant to facilitate relations between Hydro-Québec and its customers when medium- or high-voltage electrical installations are installed or modified. This edition comes into effect on May 1, 2003, and replaces the version of March 1, 1990, entitled "Comptage de l’électricité en moyenne et en haute tension." For installations whose drawings were sealed before May 1, 2003, the previous version of this standard applies, namely the March 1, 1990, version. The standard is divided into two parts: - The Text lays out the requirements to be followed by customers in order to

maintain metering quality, protect metering equipment and keep Hydro-Québec employees safe.

- In the Appendices, Appendix A contains drawings and diagrams giving examples to explain the text of the standard. The other appendices state specific requirements for boxes, structures and other fixtures mentioned in the standard.

All dimensions are expressed in international system (SI) units. The Table of Contents lists the titles, sections and subsections found in the standard. This standard was written according to the following principles: - If an installation is to be modified, the requirements for a new installation

apply.

- If the new requirements cannot be met, the customer, consulting engineer or master electrician must contact a Hydro-Québec representative, who will refer him or her to the persons responsible in Hydro-Québec’s Expertise et développement technologique corporate unit within the Ventes et services à la clientèle department .

Standard F.22-01 of 60

TABLE OF CONTENTS

TABLE OF CONTENTS

1 PURPOSE AND SCOPE ................................................................................................................................... 7 1.1 PURPOSE ...................................................................................................................................................... 7 1.2 SCOPE .......................................................................................................................................................... 7

2 DEFINITIONS.................................................................................................................................................... 7

3 INFORMATION REQUIRED FROM CUSTOMERS ................................................................................ 10

4 METERING INTEGRITY.............................................................................................................................. 11 4.1 EXCLUSIVE USE OF METERING CIRCUIT ...................................................................................................... 11 4.2 PRIORITY OF HYDRO-QUÉBEC'S METERING EQUIPMENT OVER CUSTOMER'S EQUIPMENT........................... 11

5 EMPLOYEE PROTECTION ......................................................................................................................... 12 5.1 DISCONNECTING DEVICES.......................................................................................................................... 12 5.2 GROUNDING DEVICES ................................................................................................................................ 12

6 METERING VOLTAGE AND EQUIPMENT LOCATION ....................................................................... 13 6.1 FOR NEW INSTALLATIONS .......................................................................................................................... 13 6.2 FOR EXISTING INSTALLATIONS................................................................................................................... 13 6.3 SELECTION OF METERING EQUIPMENT........................................................................................................ 13 6.4 120-V SUPPLY CIRCUIT .............................................................................................................................. 13

7 INSTRUMENT TRANSFORMERS .............................................................................................................. 14 7.1 HYDRO-QUÉBEC'S RESPONSIBILITIES......................................................................................................... 14 7.2 CUSTOMER'S RESPONSIBILITIES.................................................................................................................. 14

7.2.1 Location ............................................................................................................................................... 14 7.2.2 Installation ........................................................................................................................................... 14 7.2.3 Layout .................................................................................................................................................. 14 7.2.4 Electrical and mechanical protection .................................................................................................. 15 7.2.5 Ground resistance and reactance ........................................................................................................ 15 7.2.6 Grounding of instrument transformer body ......................................................................................... 15

8 SECONDARY METERING CIRCUIT ......................................................................................................... 16 8.1 RESPONSIBILITIES ...................................................................................................................................... 16 8.2 INDOOR RACEWAY..................................................................................................................................... 16 8.3 OUTDOOR RACEWAY AND FROST PROTECTION........................................................................................... 16 8.4 RACEWAY LAYOUT .................................................................................................................................... 16 8.5 RACEWAY BENDS....................................................................................................................................... 16 8.6 LENGTH OF SECONDARY METERING CIRCUIT.............................................................................................. 17 8.7 PULLING CORD........................................................................................................................................... 17

9 REMOTE METERING AND COMMUNICATION BETWEEN METERS............................................. 18 9.1 RESPONSIBILITIES ...................................................................................................................................... 18 9.2 REMOTE METERING.................................................................................................................................... 18 9.3 COMMUNICATION BETWEEN METERS ......................................................................................................... 18


TABLE OF CONTENTS

10 METAL-CLAD SUBSTATION ...................................................................................................................... 20 10.1 METERING CHAMBER................................................................................................................................. 20

10.1.1 General............................................................................................................................................ 20 10.1.2 Danger signs ................................................................................................................................... 20 10.1.3 Width of metering chamber ............................................................................................................. 20 10.1.4 Access to metering chamber............................................................................................................ 21 10.1.5 Protective barrier for metering chamber ........................................................................................ 21 10.1.6 Insulating shields............................................................................................................................. 22 10.1.7 Fixing ring....................................................................................................................................... 22 10.1.8 Positioning of instrument transformers........................................................................................... 22 10.1.9 Grounding studs .............................................................................................................................. 22

10.2 VISIBLE DISCONNECTING DEVICES ............................................................................................................. 23 10.3 NEUTRAL CONDUCTOR IN A MEDIUM-VOLTAGE METAL-CLAD SUBSTATION ............................................... 23 10.4 CONNECTING CHAMBER............................................................................................................................. 23 10.5 RACEWAY.................................................................................................................................................. 24 10.6 METER BOX ............................................................................................................................................... 24 10.7 METER BOX GROUNDING ........................................................................................................................... 24

11 STRUCTURES ................................................................................................................................................. 25 11.1 VISIBLE DISCONNECTING DEVICES ............................................................................................................. 25 11.2 INSTRUMENT TRANSFORMERS.................................................................................................................... 26 11.3 GROUNDING STUDS.................................................................................................................................... 26 11.4 SURGE ARRESTERS..................................................................................................................................... 26 11.5 PULL BOX .................................................................................................................................................. 27 11.6 JUNCTION BOX ........................................................................................................................................... 27 11.7 METER BOX ............................................................................................................................................... 27 11.8 BOX GROUNDING ....................................................................................................................................... 27 11.9 RACEWAY.................................................................................................................................................. 28

11.9.1 Raceway between instrument transformers and pull box................................................................ 28 11.9.2 Raceway between pull box and junction box................................................................................... 28 11.9.3 Raceway between pull box and meter box....................................................................................... 28 11.9.4 Raceway between instrument transformers and junction box ......................................................... 29 11.9.5 Raceway between junction box and meter box................................................................................ 29

11.10 SECONDARY METERING CABLE .................................................................................................................. 30 11.10.1 Overhead ......................................................................................................................................... 30 11.10.2 Underground ................................................................................................................................... 30

12 METERS ........................................................................................................................................................... 31 12.1 METER ACCESS .......................................................................................................................................... 31 12.2 METER BOXES............................................................................................................................................ 31

12.2.1 Indoor meter boxes.......................................................................................................................... 31 12.2.2 Indoor meter boxes for metering installations with one meter........................................................ 31 12.2.3 Indoor meter boxes for metering installations with two or more meters ........................................ 31 12.2.4 Outdoor meter boxes ....................................................................................................................... 32

12.3 METER BOX GROUNDING ........................................................................................................................... 32 13 PERSONS RESPONSIBLE FOR IMPLEMENTATION ............................................................................ 32

14 PERSONS RESPONSIBLE FOR APPLICATION ...................................................................................... 32

15 ACKNOWLEDGMENTS................................................................................................................................ 32


TABLE OF CONTENTS

APPENDIX A ILLUSTRATIONS .......................................................................................................................... 33

APPENDIX B PULL BOXES FOR SECONDARY METERING CABLES ...................................................... 51 1.0 PURPOSE................................................................................................................................................. 51 2.0 REFERENCES ......................................................................................................................................... 51 3.0 CONDITIONS OF USE............................................................................................................................ 51 4.0 CONSTRUCTION.................................................................................................................................... 51 5.0 DIMENSIONS.......................................................................................................................................... 51 6.0 MATERIALS............................................................................................................................................ 51

APPENDIX C JUNCTION BOXES FOR SECONDARY METERING CABLES............................................ 52 1.0 PURPOSE................................................................................................................................................. 52 2.0 REFERENCES ......................................................................................................................................... 52 3.0 CONDITIONS OF USE............................................................................................................................ 52 4.0 CONSTRUCTION.................................................................................................................................... 52 5.0 DIMENSIONS.......................................................................................................................................... 53 6.0 MATERIALS............................................................................................................................................ 53

APPENDIX D METER BOXES.............................................................................................................................. 54 1.0 PURPOSE................................................................................................................................................. 54 2.0 REFERENCES ......................................................................................................................................... 54 3.0 BOX TYPES............................................................................................................................................. 54

3.1 Indoor installation................................................................................................................................ 54 3.2 Outdoor installation............................................................................................................................. 54

4.0 DIMENSIONS.......................................................................................................................................... 54 5.0 CONSTRUCTION.................................................................................................................................... 55 6.0 MATERIALS............................................................................................................................................ 55 7.0 DIMENSIONS AND CHARACTERISTICS........................................................................................... 56

7.1 Type 3R box.......................................................................................................................................... 56 7.2 Type 4X box.......................................................................................................................................... 56 7.3 Type 12 box .......................................................................................................................................... 56

APPENDIX E METALLIC STRUCTURES FOR INSTRUMENT TRANSFORMERS.................................. 57 1.0 PURPOSE................................................................................................................................................. 57 2.0 STRUCTURE DIMENSIONS.................................................................................................................. 57

APPENDIX F SURGE ARRESTERS FOR 25-KV AND 34.5-KV SYSTEMS .................................................. 59 1.0 PURPOSE................................................................................................................................................. 59 2.0 25-KV SYSTEM ....................................................................................................................................... 59 3.0 34.5-KV SYSTEM .................................................................................................................................... 59

APPENDIX G GROUNDING STUDS AND CLAMPS FOR 25-KV SYSTEMS............................................... 60 1.0 PURPOSE................................................................................................................................................. 60 2.0 25-KV SYSTEM ....................................................................................................................................... 60


1 PURPOSE AND SCOPE

1.1 Purpose

1.2 Scope

The purpose of this standard is to provide general information and to state the technical requirements and conditions governing electricity metering in medium- and high-voltage installations for billing purposes.

This standard applies to the metering installations of Hydro-Québec customers throughout Québec. It applies to all new medium- and high-voltage metering installations and all requests to modify existing installations.

2 DEFINITIONS

ACCEPT: To certify that electrical and civil engineering specifications and works comply with Hydro-Québec's requirements.

CODE: Québec Electrical Code (CSA C22.10).

CONNECTING CHAMBER: Inside a metal-clad substation, a compartment within two doors housing metering fixtures that are used to connect instrument transformer secondaries.

CONNECTION POINT: The point where the electrical installation of the premises receiving electricity is connected to Hydro-Québec's system.

(Bylaw 634, S. 3)

CUSTOMER: An individual, a partnership, a corporation or an agency holding one or more contracts.

(Bylaw 634, S. 3)

Note: The term "consumer," rather than customer, is used in the Québec Electrical Code (CSA C22.10).


DELIVERY POINT: Any point located immediately on the load side of Hydro-Québec's metering equipment from which electricity is put at the disposal of the customer. In cases where Hydro-Québec does not install metering equipment, or where it is on the line side of the connection point, the delivery point is the connection point.

(Bylaw 634, S. 3)

DUCT BANK: A type of underground concrete raceway through which a number of conduits run side-by-side or above each other.

HIGH VOLTAGE: The nominal voltage between phases greater than 50,000 volts.

(Bylaw 634, S. 3)

INDEPENDENT PRODUCER: A producer of electrical power who either consumes for its own needs or sells, to third parties or to a distributor, all or part of the electrical power it produces.

(Rates Bylaw May 1 1998)

JUNCTION BOX: An approved metal box installed for the purpose of joining metering cables.

MEDIUM VOLTAGE: The nominal voltage between phases of more than 750 volts, up to and including 50,000 volts.

(Bylaw 634, S. 3)

METAL-CLAD SUBSTATION: A substation in which disconnecting and protection equipment, instrument transformers and bus-bars are housed inside individual metal enclosures.

METERING EQUIPMENT: The current transformer, voltage transformer, meter, indicator, auxiliary recording device, auxiliary control unit, terminal testing box, cabling and any other device used exclusively by Hydro-Québec for metering electricity.

(Bylaw 634, S. 3)

PROTECTIVE BARRIER: A permanent fitting in or near a device. This fitting is not in contact with uninsulated energized parts and is installed at a minimum prescribed distance, such that individuals may be in constant or accidental contact with the barrier without danger to their safety.

PULL BOX: An approved metal box installed to facilitate the installation of metering cables.


RACEWAY (or CANALIZATION, in Bylaw 634): The series of hollow components, usually with circular cross-sections, designed to contain cables.

(Bylaw 634, S. 3)

A raceway may contain metal or non-metallic conduits and liquid-tight flexible conduits, but not flexible metal conduits. All conduits in a raceway must be installed in compliance with the provisions applicable to raceways in Subsection 12-1300, Section 12 of the Québec Electrical Code (CSA C22.10).

READILY ACCESSIBLE METER LOCATION: An accessible place reached by an open path at least 600 mm wide and 2 m high, which does not require people to climb over or remove obstacles, or to use a portable ladder, chair, etc. to reach the metering equipment. Indoor locations must have lighting. Outdoor locations must be accessible even when the customer is not on the premises.

STRUCTURE: Any civil engineering work, including the necessary material, on or in which electrical equipment is installed or attached.

(Bylaw 634, S. 3)

TRANSFORMING STATION: The structures and equipment required to transform electricity.

(Bylaw 634, S. 3)

VISIBLE DISCONNECTING POINT: The point where an electrical circuit is interrupted. This point must be verifiable by a direct view of separated contacts.


3 INFORMATION REQUIRED FROM CUSTOMERS

Any new metering installation or modification to an existing installation requires prior consultation between Hydro-Québec and the customer or its duly authorized representatives. The customer must give Hydro-Québec, at least two months before any acquisition of materials, two copies of the following documents and information:

- expected start-up date; - present power and target power in the short term (two years) and medium

term (five years); - standard power behaviour and its variation during an annual cycle; - characteristics of the load to be metered; - preliminary single-line diagram showing the proposed location for installation

of the metering equipment; - layout plan with reference to equipment locations; - three-line diagram of the electrical installation; - electrical and mechanical plan of the metering installation; - information about protection system settings and functions. Hydro-Québec comments on the technical drawings received, certifies that the plans indicate the requested modifications, if any, and returns them to the customer. Independent producers, in addition to providing the information required by Hydro-Québec, must comply with the metering provisions specified in a connection agreement concluded beforehand with the Direction Commercialisation of Hydro-Québec's TransÉnergie division.


4 METERING INTEGRITY

4.1

r assumes the cost of all additional equipment required, including installation.

4.2 etering equipment over customer's equipment

installation of load ontrol equipment on the line side of the metering equipment.

be used to supply the protective relays of the installation of the roperty to be supplied.

ro-Québec must be installed on e load side of Hydro-Québec's metering equipment.

or tallation may be

installed on the line side of Hydro-Québec's metering equipment.

(Bylaw 634, S. 75)

Exclusive use of metering circuit

Hydro-Québec's metering equipment must at all times remain independent of equipment used for load control, protection and load management. Should an eligible customer wish to obtain information on its energy consumption, power demand or power factor, or on the synchronization of the end of billing interval, Hydro-Québec will install appropriate devices to isolate its equipment from the customer's.

The custome

Priority of Hydro-Québec's m

Hydro-Québec's authorization must be obtained prior to […] thec […] only one phase transformer may be installed and must already have been installed by the manufacturer and p Any load management equipment not belonging to Hydth Only metering transformers not belonging to Hydro-Québec which are used solely felectrical protection or indication of the voltage of the electrical ins


5 EMPLOYEE PROTECTION

5.1

5.2

The specifications for grounding studs and grounding clamps are given in Appendix G.

See Appendix A, Illustrations 01 to 03, 05 and 08 to 12.

Disconnecting devices

Visible disconnecting devices owned by the customer must be located on both the supply and load sides of Hydro-Québec’s instrument transformers, and must be equipped with lockouts to prevent closing when Hydro-Québec is working on its equipment. Hydro-Québec employees must have direct access to the lockouts from the ground, without having to use a hotstick, bucket or other means to reach them. For independent producers with a medium-voltage connection to Hydro-Québec's distribution system, the visible disconnecting devices do not have to belong to them. If there is more than one disconnecting device on the load side of the instrument transformers and they are not all located within the same enclosure, a single visible disconnecting device must be installed inside the instrument transformer enclosure. All manoeuvring mechanisms of disconnecting devices must be visible from the location where the instrument transformers are installed.

See Appendix A, Illustrations 05, 07 and 13.

Grounding devices

The customer must provide devices to allow the installation of portable grounding sets on the supply and load sides of the instrument transformers, for all types of installations.

Devices such as grounding studs are standardized for line voltages of 25 kV or less.


6 METERING VOLTAGE AND EQUIPMENT LOCATION

6.1

6.2

6.3

6.4

For new installations

Hydro-Québec selects the metering reference voltage, the metering configuration, and the necessary metering equipment, which is installed on the customer's premises. The location proposed by the customer for installation of the metering equipment is subject to Hydro-Québec's acceptance. Metering equipment cannot be installed in Hydro-Québec substations or on Hydro-Québec's network.

For existing installations

Requests to modify a metering installation must be referred to the local Mesurage unit of Hydro-Québec. All modifications must comply with this standard.

Selection of metering equipment

At the customer's request, Hydro-Québec will inform the customer of the type of equipment it intends to install. However, Hydro-Québec cannot formally guarantee that it will maintain its initial choice. Nevertheless, if a change is made to the initial choice, the customer will be notified accordingly.

120-V supply circuit

At Hydro-Québec's request, the customer is to supply, install, identify and connect at the designated locations a 15-A, 120-V, 60-Hz alternating current circuit in accordance with the table entitled Customer Voltage Limits – Variations Allowed in Hydro-Québec's Standard E. 21-10, Low-Voltage Electricity Supply Standard. This circuit, reserved exclusively for Hydro-Québec's metering equipment, must be equipped with a blocking device and a sealing device to which seals can be affixed. The circuit must not be exposed to frequent, uncontrolled de-energizing. The customer is required to record all cases of de-energizing in a log, which must be made available if requested by a Hydro-Québec representative.


7 INSTRUMENT TRANSFORMERS

7.1

7.2

Hydro-Québec's responsibilities

Hydro-Québec informs the customer of the number and type of instrument transformers it plans to use so that the customer can design a metal-clad substation or other structure. If a change is made to the initial choice, Hydro-Québec must notify the customer of the change. Hydro-Québec supplies the instrument transformers required for each installation.

Customer's responsibilities

7.2.1 Location Instrument transformers may be installed inside or outside the building. In all cases, the customer must ensure adequate access and space to handle and connect instrument transformers during their installation or replacement.

7.2.2 Installation In all cases and for all types of work, the customer must install the instrument transformers provided by Hydro-Québec. The customer is to connect the primary terminals giving due regard to the priority of voltage transformers over current transformers, as well as to the reference polarity (namely H1 or or +). This reference must always be oriented to the supply side, i.e. the Hydro-Québec system side.

7.2.3 Layout When designing the structure or metal-clad substation, the customer must take into account voltage gradients on the periphery of the instrument transformers in order to determine the spacing between transformers. The customer must also design the structure or metal-clad substation taking into account the weight and physical characteristics of the instrument transformers used. In addition, the mechanical stress exerted on the instrument transformers by the primary connections and temperature changes must be taken into consideration in order to avoid damage to the instrument transformers. The primary terminals of instrument transformers must never serve as a connection point for the customer's electrical circuit.


7.2.4 Electrical and mechanical protection The customer's installation must be set up in such a way as to ensure the electrical and mechanical protection of Hydro-Québec's equipment installed on the customer's property, in compliance with the provisions of the Québec Electrical Code (CSA C22.10), Hydro-Québec Standard E. 21-12 Fourniture d'électricité en moyenne tension, and a document entitled Exigences techniques pour installations de clients raccordés au réseau de transport d'Hydro-Québec available from the Planification des actifs et Affaires réglementaires branch of Hydro-Québec's TransÉnergie division.

7.2.5 Ground resistance and reactance If the customer wishes to use ground resistance or reactance, prior authorization must be obtained from the Expertise et développement technologique corporate unit of the Ventes et services à la clientèle department of Hydro-Québec. This unit will make sure that the design of the installation proposed by the customer takes into account the maximum voltage elevation that will be applied to Hydro-Québec's instrument transformers and cables. Hydro-Québec reserves the right to reject the design proposed by the customer. After obtaining Hydro-Québec's authorization, the customer may install ground resistance or reactance in its protection system. The neutral used for metering purposes must be connected on the supply side of the ground resistance or reactance with a conductor of the appropriate gauge. This arrangement enables Hydro-Québec to obtain correct metering data without interfering with the customer's protection system.

See Appendix A, Illustration 06.

7.2.6 Grounding of instrument transformer body Grounding for instrument transformer bodies must always be independent from the neutral connection and use the ground terminal of the instrument transformers, in compliance with the Québec Electrical Code (CSA C22.10).


8 SECONDARY METERING CIRCUIT

8.1 Responsibilities

8.2

8.3

8.4

8.5

The customer supplies and installs the raceway, pull boxes and junction boxes required for wiring the various components of the metering equipment. Hydro-Québec supplies, installs and connects wiring between its equipment components except for the overhead metering cable, which is installed by the customer (see paragraph 11.10.1).

Indoor raceway

The customer must supply and install the indoor rigid conduits required inside the building, from the entry point of Hydro-Québec's metering cable up to the metering installation. The metering cable must run through a trough with separations, or be installed in a rigid conduit. In all cases, if the metering cable is installed near the customer's medium- or high-voltage supply cables, it must be electrically protected by a steel conduit.

Outdoor raceway and frost protection

The customer must supply and install outdoor rigid conduits in such a way as to protect them from freezing. The base of the duct bank must be buried at a depth equal to the frost line, determined at the site. Backfill covering the duct bank must be no less than 900 mm deep, measured from the base of the raceway. Depending on the location, greater depth may be necessary if the raceway is exposed to vehicle traffic. In all cases, the customer must use brightly coloured warning tape to mark the presence of the raceway in case of future excavation at the site.

Raceway layout

The customer must configure the raceway such that electromagnetic disturbances cannot disturb or affect cables used to transmit metering data, or cables used for voltage and current signals.

Raceway bends

The sum of the bends in the raceway used for the metering cable(s) must not exceed 180° between each pulling point.


8.6

8.7

Length of secondary metering circuit

The length of the secondary metering circuit must not exceed 175 metres. However, Hydro-Québec's cable between the junction box or the connecting chamber of the metal-clad substation and the meter box must be no longer than 150 metres, have no splices and have a gauge of 9 AWG.

Pulling cord

A cord made of polypropylene or another equivalent synthetic material, at least 6 mm in diameter, is required to facilitate pulling of cables through the conduits.


9 REMOTE METERING AND COMMUNICATION BETWEEN METERS

9.1 Responsibilities

9.2

9.3

Hydro-Québec informs the customer of the communication mode and protocol it plans to use for remote metering. The customer is responsible for installing the means of communication chosen by Hydro-Québec.

Remote metering

If a customer's metering installation has several delivery points on the same property, grouping together the consumption data is always preferable so as to allow remote reading of the metering equipment at a single communication point. Hydro-Québec defrays the installation cost for the means of communication chosen, for this communication point only. Hydro-Québec assumes all associated operating costs. All costs pertaining to installing, maintaining and operating additional communication points on the same property must be defrayed by the customer.

Communication between meters

Depending on the mode of communication chosen by Hydro-Québec, data transmission may require a communication cable or specific equipment. The communication cable must be suitable for the transmission protocol used by the metering devices. The customer must then install the appropriate cables, or have them installed by another company. The customer must guarantee their integrity and safety for employees who work at the customer's premises, in compliance with trade practices, the standards in force and applicable legislation. Cables must be installed and protected in a safe manner, to avoid any interruption of service. If splices have to be made, they must comply with the manufacturer's technical specifications. If metering devices that need to be linked are located in several non-adjacent cabinets, a communication channel with a 65-mm rigid conduit must be used to link them. This channel provides a single access point for all the metering data needed for remote reading of the metering devices for billing purposes. If the cabinets are adjacent to each other, they must be linked through a rigid conduit 40 mm in diameter.


For long distances, or if the cable is installed in an environment exposed to electromagnetic disturbances that could reduce communication reliability, Hydro-Québec will indicate an alternative solution and the applicable modifications after studying the specific case. The customer is responsible for supplying, installing and maintaining the communication channel between the different devices needing to be linked. However, this channel is reserved for the exclusive use of Hydro-Québec, and the metering equipment must be connected by Hydro-Québec employees.


10 METAL-CLAD SUBSTATION

10.1 Metering chamber

Hydro-Québec requires that one whole section of the metal-clad substation be divided into two chambers and isolated by a metal partition. One of the chambers, identified by Hydro-Québec as the metering chamber, is reserved for the installation of instrument transformers, while the other, the connecting chamber, is for the installation of metering fixtures.

See Appendix A, Illustrations 01 to 03.

The metal-clad substation must comply with Standard G10-1 1970, Revenue Metering Equipment in Switchgear Assemblies of the Electrical/Electronic Manufacturers Association of Canada (EEMAC), as well as Standard CAN3-C308-M85, The Principles and Practices of Insulation Coordination of the Canadian Standards Association (CSA), unless otherwise indicated herein.

10.1.1 General The metering chamber of a metal-clad substation houses the metering equipment. The chamber must meet all requirements of the standards in force and of the instrument transformer manufacturers. However, the restrictions inherent in a metal-clad substation must in no way influence Hydro-Québec's choice of instrument transformers.

10.1.2 Danger signs Signs marked "DANGER" accompanied by the corresponding international symbol, or bearing only the corresponding international symbol, must be placed in clear view on the access panels of the metering chamber. The voltage level at which the substation may be operated must also be clearly indicated. The danger signs are supplied and installed by Hydro-Québec employees in accordance with the directives and instructions in force.

10.1.3 Width of metering chamber For voltages below 15 kV, the minimum chamber width is 850 mm. For voltages between 15 kV and 35 kV, the width is 1,500 mm. The depth must be sufficient to allow instrument transformers to be installed.



10.1.4 Access to metering chamber At least one panel with hinges on one side and bolts on the other must allow access to the instrument transformers from the rear, side or front of the metering chamber. All such panels must be equipped with sealing devices that allow seals to be affixed. The metal partition separating the metering equipment from the instrument transformers must have hinges on one side and bolts on the other. The metal partition must open on the same side as the door of the connecting chamber and be able to open to a 90o angle after the metering fixtures are installed. Its opening gives access to the protective barrier and to the instrument transformers inside the metering chamber.


10.1.5 Protective barrier for metering chamber To facilitate the work of Hydro-Québec employees, the manufacturer of the metal-clad substation must install a hinged protective barrier behind the metal partition that gives access to the metering chamber. The protective barrier must be made of polycarbonate at least 6 mm thick and a metallic wire netting 50 mm high by 25 mm wide, in compliance with the provisions of Hydro-Québec's plan AG95\AG033-02 (Rev. 2 or more recent) entitled "Distance d'approche." Openings 125 mm in diameter make it possible to view the instrument transformers, check for the absence of voltage when work is being done, and take temperature measurements of the installation by infrared thermography. The protective barrier must open on the same side as the door preceding it and be able to open to a 90o angle. A closing mechanism is also required, to ensure that the protective barrier stays in place after the metering chamber door closes. The protective barrier must be 250 mm from all energized components. For a metal-clad substation with a clearance of at least 2,000 mm for the front and rear access doors, the protective barrier and its openings must be positioned to facilitate the work of Hydro-Québec employees. In this case, the metal partition that gives access to the metering chamber opposite from the protective barrier is equipped with a polycarbonate window, 300 mm high by 200 mm wide, through which the protective barrier can be seen. For a metal-clad substation against a wall or whose rear access does not have a clearance of at least 2,000 mm, the protective barrier is placed at the front, immediately after the metal partition that gives access to the metering chamber of the metal-clad substation. This door is equipped with a polycarbonate window, 300 mm high by 200 mm wide, through which the protective barrier can be seen.



10.1.6 Insulating shields The manufacturer of the metal-clad substation must install an insulating shield where the bus-bars cross the walls on the supply and load sides of the instrument transformers. The insulating shield must permanently obstruct the openings in the walls and have appropriate dielectric properties for the installation's voltage level.


10.1.7 Fixing ring The manufacturer of the metal-clad substation must install a fixing ring on the walls on the supply and load sides of the instrument transformers. This metallic ring, 50 mm in diameter and set at least 1,200 mm but no more than 1,800 mm above ground level, is used to secure the wires of portable grounding sets during work performed by Hydro-Québec employees.


10.1.8 Positioning of instrument transformers Instrument transformers in the metal-clad substation must be installed no less than 300 mm above ground level, to facilitate the connection of their secondary terminals.


10.1.9 Grounding studs For installations in metal-clad substations, the devices used for installing portable grounding sets must be placed on the supply and load sides of the instrument transformers in the metering chamber. The grounding studs are supplied by the manufacturer of the metal-clad substation or by the customer, at the customer's expense. They are installed on the bus-bars in the metering chamber on the supply and load sides of the voltage and current transformers and on the grounding bus-bar of the metal-clad substation. The grounding studs on the bus-bars must be 100 mm from each other (on alternating sides), so that portable grounding clamps and wires can be easily attached when work is performed. A minimum clearance of at least 2,000 mm is required in front of the chamber door that gives access to the instrument transformers, so that Hydro-Québec employees can install portable grounding sets when work is performed.

See Appendix A, Illustrations 01 to 03 and 05.


10.2

10.3

10.4

Visible disconnecting devices

If the installation is supplied by Hydro-Québec's underground network or by an overhead-underground junction, the visible disconnecting device required by Hydro-Québec on the supply side of the instrument transformers must be followed immediately by a circuit breaker adjacent to the metering chamber.

If the installation is supplied by Hydro-Québec's overhead power system, the customer's electrical protection may precede the visible disconnecting device on the supply side of the instrument transformers. However, this disconnecting device must be adjacent to the metering chamber.

In all cases, the visible disconnecting device on the load side of the instrument transformers must be adjacent to the metering chamber.


Neutral conductor in a medium-voltage metal-clad substation

In the case of a wye configuration, Hydro-Québec may allow the customer's ground to be used as the neutral conductor, provided that the supply neutral is connected to it and the distance between the connection point of the supply neutral and the instrument transformers does not exceed 25 metres. In this case, Hydro-Québec employees must be able to visually check for connection continuity, from the common neutral of the voltage transformers to the supply neutral. If there is any doubt as to the continuity of the connection, Hydro-Québec may require the customer to prolong the supply neutral. The gauge and insulation of the neutral conductor must comply with the provisions of the Québec Electrical Code (CSA C22.10).


Connecting chamber

The connecting chamber is a compartment reserved for metering fixtures. This chamber must have a minimum depth of 400 mm and be for the exclusive use of Hydro-Québec. In addition, there must be a minimum clearance of 200 mm between the wall of the chamber and the door of the metering chamber.

A removable metal mounting plate at least 300 mm wide by 900 mm high and at least 1.5 mm thick must be superimposed on the wall of the connecting chamber, mounted on bolts. A clearance of 10 mm is required between the edges of the metal mounting plate and all sides of the connecting chamber.


There must also be a clearance of 10 mm between the metal mounting plate and the connecting chamber wall on which it is superimposed. The metal mounting plate must be installed by the manufacturer of the metal-clad substation. In some cases, Hydro-Québec may install only some of its fixtures in the connecting chamber, and install the remainder in another box.

See Appendix A, Illustrations 01 to 04. 10.5

10.6

10.7

Raceway

A rigid conduit must be installed between the meter box and the connecting chamber of a metal-clad substation. This raceway is reserved for the exclusive use of Hydro-Québec and must be at least 65 mm in size. The raceway must end inside the front part of the connecting chamber in the metal-clad substation.

The sum of the bends of the raceway used for the metering cables must not exceed 180° between the two points to be connected. If the sum of the bends does exceed 180°, then LB, LL and LG elbows must be used in these installations. All meters must be installed outside the metal-clad substation.


Meter box

The meter box must be secured solidly to a wall or sit on a floor free of vibrations. Its location must be approved by Hydro-Québec's representative. The top of the meter box must be 1,500 mm to 1,800 mm above ground level. An area of at least 1,000 mm must be kept permanently clear in front of the meter box when the door or doors open to a 90o angle.

Meter box grounding

The customer is responsible for grounding the meter box used to protect the metering equipment and Hydro-Québec's employees. The meter box must be of metal and connected to the metallic structure or to the installation's ground rod.


11 STRUCTURES

11.1 Visible disconnecting devices

For all overhead single-phase medium-voltage installations on a single wood pole, a single visible disconnecting device is allowed in the structure where the instrument transformers are installed. For this type of installation, the second visible disconnecting device must necessarily be installed immediately on the load side of the instrument transformers, on another wood pole or in another structure.

See Appendix A, Illustrations 08 and 09.

For multi-phase medium-voltage installations on a single wood pole or on a rigid metal platform between two wood poles, the visible disconnecting devices must be located immediately on the supply and load sides of the instrument transformers, in separate structures.


If it is not possible to set up separate structures on either side of the metering installation on the customer's property and maintain the minimum distances between the first of the three wood poles and Hydro-Québec's system, then a two-pole installation is allowed. In this case, the visible disconnecting device on the load side must be installed on the same pole as the instrument transformers. The customer may install the protection devices required by the installation on either of the two poles, provided that they are on the supply side of the instrument transformers.

For multi-phase medium-voltage installations on a rigid metal platform in a metallic structure, the visible disconnecting devices may be placed in the same structure, in such a way as to be easily handled and not restrict access to the instrument transformers when work is being done.


For all other types of high-voltage structures, the customer or consulting engineering firm must provide a location for visible disconnecting devices on the supply and load sides of the instrument transformers in separate structures. The positioning must allow easy handling of the disconnecting devices and not restrict access to the instrument transformers when work is being done.



11.2

11.3

11.4

the layout and number shown in

ers shown in Illustrations 08, 09, 10, 11 and 12 in Appendix A are given in Appendix F.


Instrument transformers

The required clearances are illustrated in Appendix A for medium-voltage overhead installations on wood poles. The characteristics of the instrument transformers structures shown in Illustrations 08, 09, 10 and 11 are described in Appendix E.


The customer or the customer's consulting engineering firm must check the minimum clearances required if the voltage levels of the customer's installation are other than those illustrated or specified in this standard.

Grounding studs

All installations must be equipped with grounding studs so that portable grounding sets can be installed. For 25-kV medium-voltage installations on wood poles or on a rigid metal platform between two wood poles, the grounding studs must be placed on the jumpers on the supply side of the voltage and current transformers or combined instrument transformers, as well as on the load side of the current transformers or combined instrument transformers.


Surge arresters

For medium-voltage installations in a structure and pad-mounted high-voltage installations, the instrument transformers must be positioned so as to be protected by the surge arresters of the customer's installation. The installation of surge arresters must comply with standards and engineering practices in force and be appropriate for the voltage level of the installation. The type of surge arrester selected must correspond to the configuration of the customer's substation.

For 25-kV medium-voltage overhead installations on wood poles or on a rigid metal platform between two wood poles, surge arresters must be installed on the supply and load sides of combined instrument transformers and separate current transformers. Asingle surge arrester must be connected to each separate voltage transformer. The customer must install surge arresters according toIllustrations 08, 09, 10, 11 and 12 in Appendix A. The characteristics of the surge arrest


11.5

11.6

11.7

11.8

Pull box

The customer may, for practical or economic reasons, decide to install a pull box between the instrument transformers and the junction box. In this case, the pull box must be installed in the structure in a place that allows Hydro-Québec to easily install the secondary wiring of the instrument transformers. The pull box must meet the specifications in Appendix B of this standard and be equipped with a device that prevents condensation and facilitates drainage.

See Appendix A, Illustrations 08 to 11, 14 and 15

Junction box

The customer must install a junction box if the instrument transformers are integrated into a structure. The junction box must be secured to the foot of the structure, at a height between 1,500 mm and 1,800 mm. The junction box must meet the specifications in Appendix C of this standard and be equipped with a device that prevents condensation and facilitates drainage.

See Appendix A, Illustrations 14 to 17

Meter box

The meter box must be secured solidly to the structure or to a wall, or sit on a floor free of vibrations. Its location must be approved by Hydro-Québec's representative. The top must be between 1,500 mm and 1,800 mm above ground level. A permanent clearance of at least 1,000 mm must be left in front of the meter box when the door or doors are open to a 90o angle.


Box grounding

All boxes must be metallic. The customer is responsible for grounding them. They must be connected to the metallic structure or to the ground rod.


11.9 Raceway

11.9.1 Raceway between instrument transformers and pull box To facilitate their installation and replacement, separate medium-voltage instrument transformers must be connected individually to the pull box by a liquid-tight raceway no less than 25 mm in diameter.


To facilitate their installation and replacement, combined medium-voltage instrument transformers must be connected individually to the pull box by a liquid-tight raceway no less than 50 mm in diameter.


11.9.2 Raceway between pull box and junction box If the customer decides to install a pull box, it must be connected to the junction box by a liquid-tight raceway. For multi-phase medium-voltage installations with separate or combined medium-voltage instrument transformers, the raceway must be no less than 65 mm in diameter.

See Appendix A, Illustrations 10, 11, 14 and 15.

11.9.3 Raceway between pull box and meter box For medium-voltage installations where the meter box is installed at the foot of the structure, the pull box must be connected to the meter box by a liquid-tight raceway. For single-phase installations, the raceway must be no less than 50 mm in diameter.


For multi-phase installations, the raceway must be no less than 65 mm in diameter.



11.9.4 Raceway between instrument transformers and junction box In all cases where the customer cannot or does not wish to install a pull box, the medium-voltage instrument transformers must be connected individually to the junction box by a liquid-tight raceway. For separate instrument transformers, the raceway must be no less than 25 mm in diameter. For combined instrument transformers, the raceway must be no less than 50 mm in diameter. For three-phase combined instrument transformers, the raceway must be no less than 65 mm in diameter.


To facilitate their installation and replacement, combined high-voltage instrument transformers must be connected individually to the junction box by a liquid-tight raceway 1,000 mm long, then to a rigid conduit. The raceway must be no less than 50 mm in diameter.


To facilitate their installation and replacement, separate high-voltage instrument transformers must be connected individually to the junction box by a liquid-tight raceway 1,000 mm long, then to a rigid conduit. The raceway must be no less than 25 mm in diameter.


11.9.5 Raceway between junction box and meter box For multi-phase medium- or high-voltage installations, the raceway between the junction box and the meter box must be no less than 100 mm in size.

See Appendix A, Illustrations 10 to 12 and 14 to 17.


11.10 Secondary metering cable

11.10.1 Overhead In this type of installation, the metering cable is held in place by a supporting wire of appropriate size, supplied and installed by the customer. The height of the wire must be in compliance with the Québec Electrical Code (CSA C22.10) and in no case more than 8 metres above ground level. The customer installs the metering cable and secures it to the structure and supporting wire. Hydro-Québec connects the metering cable to the instrument transformers and the various terminal blocks in the meter box and other cabinets. The supporting wire is reserved for the exclusive use of Hydro-Québec. It is for the metering cable only, and must not in any case be used to support other conductors. A rigid raceway at least 100 mm in diameter must be supplied and installed by the customer, for the cable to run through into the building that houses the meter box. The metering cable has a linear mass of approximately 2 kg/m.

11.10.2 Underground A rigid concrete or non-concrete raceway at least 100 mm in diameter must be installed between the building and the junction box secured to the structure. The same size raceway is required between the building that houses the meter box and the outdoor metal-clad substation. An expansion joint is required between the ground and the junction box, as well as at any other location on the raceway liable to be damaged by freezing.


12 METERS

12.1

12.2

Meter access

Metering equipment must be installed in a readily accessible location. Metering equipment, except for instrument transformers and cables, must never be put in a place containing exposed, accessible energized equipment, conductors or bus-bars. The door of the enclosure that gives access to the meter box must be hinged and have a handle. For safety purposes and proper operation, Hydro-Québec may require some form of protection or a permanent shelter to protect the meter box. A permanent clearance at least 1,000 mm must be left in front of the meter box when the door or doors are open at a 90o angle.

Meter boxes

The meter box forms an integral part of the customer's installation. It is supplied and installed by the customer, at the customer's expense. However, it is for the exclusive use of Hydro-Québec.

12.2.1 Indoor meter boxes The metering cable in the rigid conduit may enter through the top or the bottom of an indoor meter box. Nevertheless, it must always enter near the corner closest to the back of the box and always on the hinge side. Indoor meter boxes must be installed in a place that is heated to a minimum temperature of 10 °C with thermostatic control and adequately lit to guarantee the safety of employees at the location. The meter box may also contain a set of terminal blocks.

12.2.2 Indoor meter boxes for metering installations with one meter Where only one meter is required, the customer may install a transformer box with openings in it allowing installation of the meter on the top. The top of the box must be between 1,200 mm and 1,500 mm above ground level. Its dimensions are determined by Hydro-Québec according to the amount of space required by the fixtures. The box must also meet the specifications in Appendix D.

12.2.3 Indoor meter boxes for metering installations with two or more meters Where two or more meters are required, the meters must be installed inside a meter box.


In this case, the meters must be positioned such that the A-frame base or the top of the socket meter adapter can be secured 750 mm to 1,800 mm above ground level. The dimensions of the meter box are determined by Hydro-Québec according to the amount of space required by the fixtures. The meter box must also comply with the characteristics described in Appendix D.

12.2.4 Outdoor meter boxes Metering equipment may be installed outdoors, in a box intended for this purpose and able to withstand the local weather conditions. Metering equipment in an outdoor meter box does not have to be kept at a temperature of 10 °C, unless the metering installation requires a means of data transmission, such as a modem or other accessories that cannot withstand harsh weather. The meter box may also contain a set of terminal blocks. The meter box must meet the specifications in Appendix D.

12.3 Meter box grounding

All boxes must be metallic. The customer is responsible for their grounding, either to the metallic structure or to the ground rod. In some cases, the meter box may contain a non-tin-coated copper bus-bar for connecting the terminal blocks.

13 PERSONS RESPONSIBLE FOR IMPLEMENTATION

The director of Expertise et support à la clientèle of the Ventes et services à la clientèle department and the director of Expertise et support technique du réseau de distribution of the Réseau department are responsible for implementation of this standard.

14 PERSONS RESPONSIBLE FOR APPLICATION

The territory directors in Hydro-Québec Distribution are responsible for the application of this standard in their respective territories.

15 ACKNOWLEDGMENTS

The Expertise et développement technologique unit wishes to thank the following people for their help in writing this standard: Robert Auger, Joseph-Marie Bélanger Eng., Jacques Campeau, Robert Foisy Eng., Nathalie Paquette and André Séguin. The unit also thanks everyone in the Ventes et services à la clientèle and Réseau departments who provided input for this new edition.


APPENDICES

APPENDIX A

ILLUSTRATIONS

Standard F22.01

APPENDICES

APPENDIX B

PULL BOXES FOR SECONDARY METERING CABLES

1.0 PURPOSE

The purpose of this appendix is to state the specifications for pull boxes used to install metering cables.

2.0 REFERENCES

Pull boxes must comply with Section 2-400, Enclosures, Type Designations and Use, paragraph 1 d) in the Canadian Electrical Code, and paragraph 1.1 a. 2., Enclosures for indoor or outdoor locations, Type 4X in NEMA standard 250 (1997). Type 4X pull boxes must meet NEMA standard 250 in all respects.

3.0 CONDITIONS OF USE

Pull boxes are used occasionally to connect instrument transformers to the junction box or meter box. They facilitate the laying of conductors between instrument transformers and the terminal block. The metering cable is usually separated into several bundles from this point, to make individual connections with each instrument transformer. There must not be any splices in the conductors that make up the metering cable inside pull boxes.

4.0 CONSTRUCTION

Pull boxes must be designed to protect the cable against bad weather, dripping and splashing. Pull boxes must be equipped with a device that prevents condensation and facilitates drainage.

5.0 DIMENSIONS

The minimum dimensions of a pull box are 400 mm high, 400 mm wide and 150 mm deep.

6.0 MATERIALS

Pull boxes must be manufactured of 2.0 mm (14 USS) stainless steel or 3.175 mm aluminium.

Standard F22.01 page 51 de 60

APPENDICES

APPENDIX C

JUNCTION BOXES FOR SECONDARY METERING CABLES

1.0 PURPOSE

The purpose of this appendix is to state the specifications for junction boxes used to connect metering cables.

2.0 REFERENCES

Junction boxes must comply with Section 2-400, Enclosures, Type Designations and Use, paragraph 1 d) in the Canadian Electrical Code, and paragraph 1.1 a. 2., Enclosures for indoor or outdoor locations, Type 4X in NEMA standard 250 (1997). Type 4X junction boxes must meet NEMA standard 250 in all respects.

3.0 CONDITIONS OF USE

Junction boxes are used in places where bad weather and splashing might damage connections. They each contain a set of terminal blocks.

4.0 CONSTRUCTION

Junction boxes must be designed to protect the cable and connections from bad weather, dripping and splashing. They must be equipped with a device that prevents condensation and facilitates drainage. Junction box doors must be hinged or sliding and have a handle in the middle. All junction boxes must be equipped with at least one sealing device. A removable metal mounting plate must be superimposed at the back of the junction box, mounted on bolts. A clearance of 10 mm is required between the edges of the mounting plate and all sides of the junction box. A clearance of 10 mm must also be kept between the metal mounting plate and the back of the box. A non-tin-coated copper bus-bar, installed inside the junction box, is used to ground the terminal block set and the removable metal mounting plate by means of a conductor.


APPENDICES

5.0 DIMENSIONS

The minimum dimensions of a junction box are 600 mm high, 600 mm wide and 200 mm deep.

6.0 MATERIALS

Junction boxes must be manufactured of 2.0 mm (14 USS) stainless steel or 3.175 mm aluminium.


APPENDICES

APPENDIX D

METER BOXES

1.0 PURPOSE

The purpose of this appendix is to state the specifications for indoor and outdoor meter boxes.

2.0 REFERENCES

Meter boxes must comply with Section 2-400, Enclosures, Type Designations and Use, paragraph 1 a) for indoor use and paragraph 1 d) for outdoor use in the Canadian Electrical Code, as well as paragraph 1.1 a. 1., Enclosures for indoor locations and paragraph 1.1 a. 2., Enclosures for indoor or outdoor locations, Type 4X in NEMA standard 250 (1997). Type 3R, 4X or 12 meter boxes must meet NEMA standard 250 in all respects.

3.0 BOX TYPES

3.1 Indoor installation

Meter boxes for indoor installation may be type 12, 3R or 4X. They protect the metering equipment and eliminate the danger of direct contact with energized parts.

3.2 Outdoor installation

Meter boxes for outdoor installation may be type 3R or 4X. They protect the metering equipment and eliminate the danger of direct contact with energized parts. They also protect the equipment against bad weather, dripping and splashing. A meter box placed outdoors must be equipped with a device that prevents condensation and facilitates drainage. Type 3R meter boxes cannot be installed near public roads.

4.0 DIMENSIONS

All types of meter boxes must be built according to the dimensions obtained from employees of the local Mesurage unit of Hydro-Québec. These dimensions depend on the layout and complexity of the metering equipment.


APPENDICES

5.0 CONSTRUCTION

The meter box must have one or two doors mounted on continuous hinges. To ensure the doors are rigid, their edges on three sides must be folded back to a 90° angle to form a 13-mm lip. In addition, one of the doors must be have a strip on it that forms a lap joint with the other door. All indoor boxes must have a handle that activates three-point closing. In addition, all boxes must be equipped with at least one sealing device to which a personal padlock can be affixed. A removable metal mounting plate must be bolted onto the back of the meter box for the mounting of the metering equipment. To ensure this plate is rigid, the edges must be folded back to a 90° angle to form a 9.5-mm lip. A clearance of 10 mm is required between the edges of the mounting plate and all sides of the box. A clearance of 10 mm must also be kept between the mounting plate and the back of the box. A space of at least 275 mm must be left between the mounting plate and the doors for installation of the metering equipment. A non-tin-coated copper bus-bar, installed inside each meter box, is used to ground the terminal blocks and the removable metal mounting plate through a conductor.

6.0 MATERIALS

Meter boxes must be of metal. The accepted metals are given in the following table, according to intended use:

Material Minimum thickness Use

Low-carbon steel 2.8 mm (≈ 12 USS) Indoor

Stainless steel 2.8 mm (≈ 12 USS) Indoor and outdoor

Aluminium 3.175 mm Indoor and outdoor

Meter boxes used outdoors must be able to withstand external ice accumulation without being damaged. All other materials must receive prior authorization from the Expertise et développement technologique corporate unit of the Ventes et services à la clientèle department of Hydro-Québec.


APPENDICES

7.0 DIMENSIONS AND CHARACTERISTICS

Standard dimensions for the most common meter boxes used indoors and outdoors are given in the following table:

Height (in mm)

Width (in mm)

Depth (in mm)

NEMA type

Use

900 900 300 3R Indoor / outdoor

1200 1200 300 4X Indoor / outdoor

1200 1200 300 12 Indoor

1800 900 300 12 Indoor

1800 1800 300 12 Indoor

2200 900 300 12 Indoor

7.1 Type 3R box

This type of box may be installed indoors or outdoors. It is safe for employees because it prevents accidental contact with energized equipment. It also provides a degree of protection against falling dirt, rain, sleet and snow. Moreover, this type of box will be undamaged by the external formation of ice. 3R type boxes installed outdoors must not be near public roads.

7.2 Type 4X box

This type of box may be installed indoors or outdoors. It is safe for employees because it prevents accidental contact with energized equipment. It also provides a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water, hose-directed water and corrosion. Moreover, this type of box will be undamaged by the external formation of ice.

7.3 Type 12 box

This type of box may be used indoors only. It has no perforation and is safe for employees because it prevents accidental contact with energized equipment. It also provides a degree of protection against falling dirt, circulating dust, lint, fibers, flyings, dripping and light splashing of liquids at places other than those where knockouts are present.


APPENDICES

APPENDIX E

METALLIC STRUCTURES FOR INSTRUMENT TRANSFORMERS

1.0 PURPOSE

The purpose of this appendix is to state the specifications for metallic structures used for mounting on wood poles.

2.0 STRUCTURE DIMENSIONS

The structures must be built to the minimum dimensions shown in the drawing on the following page. The clearances specified between the instrument transformers ensure equipment protection. The metallic structures are designed to carry the weight of the instrument transformers and attached fixtures. The configuration of the structures eliminates risks of flashover between energized parts, under operating conditions liable to be found anywhere in Québec.


APPENDICES


APPENDICES

APPENDIX F

SURGE ARRESTERS FOR 25-kV AND 34.5-kV SYSTEMS

1.0 PURPOSE

The purpose of this appendix is to indicate what type of surge arrester to use to protect instrument transformers in 25-kV and 34.5-kV systems. This appendix applies to the following types of installations:

- mounted on a wood pole with a metallic structure; - mounted between two wood poles with a metal platform.


2.0 25-kV SYSTEM

Product to use: Distribution surge arrester 21 kV - 17 kV, 10 kA

Supplier Product number

Ohio Brass Canada (Harvey Hubbell Canada) OB-213617-5152

Alstom Varisil HD 21SD

Joslyn ZHP021-0024129-OK#5

3.0 34.5-kV SYSTEM

Product to use: Distribution surge arrester 27 kV - 22 kV, 10 kA

Supplier Product number

Ohio Brass Canada (Harvey Hubbell Canada) 213622-5140 Hubbell

Alstom Varisil HD 27SD

Joslyn ZHP027-0024129-OK#5


APPENDICES


APPENDIX G

GROUNDING STUDS AND CLAMPS FOR 25-kV SYSTEMS

1.0 PURPOSE

The purpose of this appendix is to state the specifications for grounding studs for metal-clad substations and mountings on wood poles in a 25-kV system.

2.0 25-kV SYSTEM

Grounding studs and clamps must comply with the Illustrations in Appendix A.

Products to use: Grounding studs,

99.9% non-tin-coated copper and stainless steel grade 304, 305 or 316

Supplier Description Product number

Hydrocom International Rod ½" diameter X 1 ½" 03-M006-1.5

Hydrocom International Rod ½" diameter X 2" 03-M006-2

Grounding clamps,

aluminium with a 20-mm spherical grounding stud

Supplier Description Product number

Hydrocom International Aluminium conductor 1/0 to 4/0 AWG 03-M-017

Hydrocom International Aluminium conductor 4/0 AWG to 350 MCM 03-M-018

Hydrocom International Aluminium conductor 350 to 500 MCM 03-M-019

electricity metering for medium- and high-voltage ...€¦ · this document corresponds to the 3rd...

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