Aviation Occupational Health and Safety Regulations
3.5 If electrical equipment on board an aircraft is live or may become live, no employee shall work on the equipment unless
(a) the employer has instructed the employee in procedures that are safe for work on live conductors;
(b) a safety ground is connected to the equipment; or
(c) the equipment is separated or disconnected from every source of electrical, hydraulic, pneumatic or other kind of energy that is capable of making electrical equipment dangerous.
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