P-E-01—Procedures for calibrating and certifying electricity meter calibration consoles pursuant to EL-ENG-12-01—Requirements for the certification of measuring apparatus—electricity meter calibration consoles
The purpose of this document is to provide procedures and guidelines for certifying and maintaining the certification of electricity meter calibration consoles pursuant to the requirements of EL-ENG-12-01. Detailed descriptions, explanations as well as test procedures related to specific requirements are provided. Worksheets related to the test procedures and requirements are available separately.
Note: Calibrations and certifications of electricity meter calibration consoles performed by organizations authorized by Measurement Canada (MC) shall be conducted in accordance with the procedures set out in this document. Organizations wishing to follow other procedures are required to submit the relevant procedures and work instructions (if applicable) for review and acceptance by MC.
This document applies to electricity meter calibration consoles that are required to be certified pursuant to the requirements of EL-ENG12-01.
3.1 EL-ENG-12-01—Requirements for the certification and use of measuring apparatus—Electricity meter calibration consoles.
3.2 Electricity and Gas Inspection Act.
3.3 Electricity and Gas Inspection Regulations.
4.0 Safety and hazard considerations
The purpose of this section is to briefly describe the safety requirements and hazards when performing calibrations for the certification and use of electricity calibration consoles.
Note: The information contained in this section provides general guidance primarily for the benefit of MC employees and is not intended to be all inclusive. Owners of calibration consoles are responsible for establishing their own safety policies.
4.2 Safety requirements
MC inspectors are required to be qualified to test calibration consoles pursuant to EL-ENG-12-01. Inspectors are deemed qualified if they have sufficient knowledge, training and experience related to several types of calibration consoles and electrical theory to perform their duty safely and properly. Qualified MC inspectors are required to understand and be aware of many safety documents, including, but not limited to, the following:
- Canada Labour Code, Part II.
- Regulations respecting occupational safety and health made under Part II of the Canada Labour Code.
- Regulations of safety and health committees and representatives.
- Treasury Board of Canada policies and publications related to occupational health and safety.
- Safety policies at the site of the calibration console inspection (including provincial and local occupational safety and health committee policies).
- Workplace Hazardous Material Information System (WHIMS) sheets.
4.3.1 The greatest hazard of working with electrical calibration consoles is that of electrical shock. Calibration consoles may be energized to their rated operating voltage and current, which can be as high as 600 volts and 200 amps. If they are incorrectly used, there is a greater risk of them exceeding their rated operating ranges. At a current level as low as 1 to 8 mA, the sensation of shock is felt by humans. When current levels exceed 8 mA, there is potential risk to life.
4.3.2 Fire and explosions are hazards if a calibration console is operated outside the manufacturer's specified limits or guidelines and instructions. Transformers, wiring and connections will burn and start an electrical fire if the console limits are exceeded. If a meter or burden is incorrectly connected or if current and voltage ratings are exceeded, an explosion or fire may result.
4.4 Considerations when working on consoles
4.4.1 Calibration consoles can operate at voltages as high as 600 volts and currents up to 200 amps. Inspectors performing calibration console certification tests set forth in EL-ENG-12-01 must comply with all Canadian occupational safety and health procedures and regulations, MC's safety practices and policies, as well as the safety practices and policies for the location where the tests are being performed.
4.4.2 If inspectors are incapable of avoiding a safety hazard at the source, all of the required personal protective safety equipment must be used before performing any tests. This includes safety shoes or boots, safety glasses, proper protective clothing, rubber and leather insulating gloves as well as proper insulated tools and equipment.
4.4.3 When installing meters or equipment on a calibration console, ensure the console is de-energized prior to making or changing connections. It is important to ensure that all connections are tight. Wires must be of the proper gauge and insulated to withstand the maximum voltage supplied. Wires must be of the minimum length necessary to hook up the measuring instruments.
4.4.4 The work area must be safe, clean and free from obstructions that could interfere with the safety of testing operations.
4.4.5 Ensure that all equipment, whether issued by the department or utilities, is checked for broken leads, frayed insulation, etc. and consult with utility personnel, know who is in charge and be familiar with the qualifications of others.
4.4.6 The open secondary of a current transformer (CT) presents a high voltage hazard. Always ensure the secondary of the CT is shorted when a load has been disconnected.
4.4.7 When performing grounding and isolation tests, a shock hazard is possible from any exposed metal panels that are not properly grounded and from voltage and current terminals that are not properly isolated. The voltage may be as high as the full operating voltage setting of the console. Protective equipment should be used and the floor under and around the console should be dry. The use of rubber matting around the console is preferred for added safety protection.
4.4.8 When performing calibration tests, inspectors must be protected and aware of the hazard of opening the secondary current circuit of any current transformer. If the current circuit of some types of consoles is inadvertently opened, an extremely high voltage may be present. The amount of leakage current between the open current terminals and ground may be found to exceed 1 mA.
4.4.9 Before using a calibration console equipped with a creep switch, make sure the correct operation of the creep switch is understood. If a console indicates that the creep switch is on, it means there is no current flowing to the meter under test positions or the console is live and current is flowing to the meter under test positions. The console should always be treated as live regardless of the status of the creep switch. There may also be high voltage on the current circuit when the creep switch is enabled. Do not make connection changes using the creep switch to disable the load as an on/off switch.
4.4.10 When performing calibration tests for demand, energy, burden effects and distortion, the console will be energized to an operation voltage and current. All safety precautions must be employed. Coil burdens placed across the test socket voltage terminals present a hazard; care must be taken to avoid contact with bare wires. There should always be plenty of space free of wiring or other possible entanglements, since these tests require moving to different meter-under-test (MUT) positions, and involve installing and removing meters. Make sure that connections remain tight when equipment is moved. These tests require setting and resetting many different loads. Care should always be taken to ensure that the voltages and currents are within the range of all standards and transformers, and the burdens in the MUT positions.
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