S-E-03—Specification for the installation and use of electricity meters—input connections and ratings

Category: Electricity
Bulletin: S-E-03
Issue date: 2006-12-08
Effective date: 2007-04-01


Table of contents


1.0 Scope

This specification applies to electricity energy and demand meters which are verified pursuant to the Electricity and Gas Inspection Act and installed subsequent to the effective date of this specification. This specification does not apply to the connections between external sensors and the main body of the meter of Multi-Customer Metering Systems.

2.0 Authority

This specification is issued under the authority of section 12(2) of the Electricity and Gas Inspection Regulations.

3.0 Background

Meters have traditionally been designed with input ratings typically suited to the standard electricity distribution system voltage and current ratings in Canada. While there is an inherent understanding as to the applicability of any given rated meter to be installed and used in a similarly given rated service, technical criteria have not been specifically established.

Metrological performance tests for meter approval and verification are based on the voltage and current ratings of the meter under test, and presuppose that the meter will be installed and used in a service which is most compatible with those identified meter ratings. For example, while a 240 volt rated meter is capable of being installed and used on a 120 volt service, it is not the intended conditions from the viewpoint of approval or verification of that meter. The same applies to a 100 ampere rated meter installed on a 5 ampere service. The installation and use of meters in a service which has dramatically different ratings from those identified on the meter may have a significant metrological impact since the meter was not assessed at approval or verification for performance under those conditions.

As technology evolves there are increasing numbers of meters designed with input ratings that do not directly correspond to the standard electricity distribution system ratings which exist in Canada, particularly with respect to current ratings.

Therefore there is a need to clearly establish the installation criteria for selection of meter ratings which are suitable for a given service rating, in addition to establishment of related input connection requirements.

4.0 Installation and use

4.1 General

4.1.1 Each verified meter to be installed and used in obtaining the basis of a charge shall be installed and used in the manner(s) established:

  1. in the Notice of Approval (NOA) or Conditional NOA as applicable, in addition to the manner specified in this document.
  2. in other Measurement Canada Installation and Use requirements, as applicable, in addition to the manner specified in this document
  3. by the manufacturer's technical specifications and criteria.

4.1.2 In any situation where a requirement of a), b), or c) above exclusively contradicts another requirement of a), b), or c), the details shall be reported to Utility Metering Division of Measurement Canada through the appropriate Regional Electricity Specialist.

4.2 Transformer type meters

4.2.1 Meters shall be connected to instrument transformers in accordance with the appropriate diagram established in the Measurement Canada Standard Drawings for Metering Installations. Other connection configurations may be used only if a formal drawing showing the actual connections is provided by the owner of the installation, and the drawing is determined to be acceptable to Measurement Canada Engineering and Laboratory Services.

4.2.2 The minimum current rating of the meter installed shall not be greater than 4 percent of the output rating of any current transformer which is connected to the meter input circuits. Also, the minimum current rating of the meter installed and used in service shall be of a rating included in the applicable Notice of Approval.

4.2.3 The maximum current rating of the meter installed shall not be less than the rating factor of the connected current transformer times the secondary rating of the connected current transformer. Also, the maximum current rating of the meter installed and used in service shall be of a rating included in the applicable Notice of Approval.

4.2.4 The operating voltage of the meter installed shall have an approved voltage rating which is between 90 percent and 105 percent of the nominal output voltage of the transformer which is connected to the meter inputs

4.2.5 Each wire or cable that connects from the output of any instrument transformer to a meter input shall be individually identifiable or traceable. It is preferable that wires be identified in accordance with the colour code established in the Measurement Canada Standard Drawings for Metering Installations.

4.2.6 Meter inputs shall be connected to instrument transformer outputs via an appropriate test switch or other similar mechanism which will facilitate safe meter removal, shorting of current transformer secondaries, and connection of circuit analysis and test equipment. This requirement applies to all new and reconstructed metering installations connected after the effective date of this specification.

4.2.7 The combined burden of meter, associated wiring and connections, and any other secondary connected devices shall not exceed the burden designation of any instrument transformer which is connected to the meter input circuits.

Note: The combined burden could be determined by adding the manufacturer specified burden ratings of all the applicable devices

4.3 Self-contained meters

4.3.1 The operating voltage rating of the meter installed shall have an approved voltage rating which is between 90 percent and 105 percent of the service voltage at the meter installation site.

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