8.21 Every conducting part of a safety ground on isolated electrical equipment shall have sufficient current carrying capacity to conduct the maximum current that is likely to be carried on any part of the equipment for such time as is necessary to permit operation of any device that is installed on the electrical equipment so that, in the event of a short circuit or other electrical current overload, the electrical equipment is automatically disconnected from its source of electrical energy.
- SOR/88-632, s. 26(F).
- point of safety grounding
point of safety grounding means
(a) a grounding bus, a station grounding network, a neutral conductor, a metal structure or an aerial ground, or
(b) one or more metal rods that are not less than 16 mm in diameter and are driven not less than l m into undisturbed compact earth at a minimum distance of 4.5 m from the base of the pole, structure, apparatus or other thing to which the electrical equipment is attached or from the area where persons on the ground work and in a direction away from the main work area. (point de mise à la terre)
(2) No safety ground shall be attached to or disconnected from isolated electrical equipment except in accordance with the following requirements:
(a) the safety ground shall, to the extent that is practicable, be attached to the pole, structure, apparatus or other thing to which the electrical equipment is attached;
(b) all isolated conductors, neutral conductors and all non-insulated surfaces of the electrical equipment shall be short-circuited, electrically bonded together and attached by a safety ground to a point of safety grounding in a manner that establishes equal voltage on all surfaces that can be touched by persons who work on the electrical equipment;
(c) the safety ground shall be attached by means of mechanical clamps that are tightened securely and are in direct contact with bare metal;
(d) the safety ground shall be so secured that none of its parts can make contact accidentally with any live electrical equipment;
(e) the safety ground shall be attached and disconnected using insulated protection equipment and tools;
(f) the safety ground shall, before it is attached to isolated electrical equipment, be attached to a point of safety grounding; and
(g) the safety ground shall, before being disconnected from the point of safety grounding, be removed from the isolated electrical equipment in such a manner that the employee avoids contact with all live conductors.
- SOR/88-632, s. 27;
- SOR/94-263, s. 21(F);
- SOR/98-427, s. 3(F).
Switches and Control Devices
(2) The path of access to every electrical switch, control device or meter shall be free from obstruction.
(3) Where an electrical switch or other device controlling the supply of electrical energy to electrical equipment is operated only by a person authorized to do so by the employer, the switch or other device shall be fitted with a locking device that only an authorized person can activate.
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