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.