Canada Occupational Health and Safety Regulations

8.20 (1) Subject to subsection (2), no work shall be performed on any electrical equipment in an area in which is located

• (a) a grounding bus,

• (b) a station grounding network,

• (c) a neutral conductor,

• (d) temporary phase grounding, or

• (e) a metal structure

unless the equipment referred to in paragraphs (a) to (e) is connected to a common grounding network.

(2) Where, after the connections referred to in subsection (1) are made, a safety ground is required to ensure the safety of an employee working on the electrical equipment referred to in that subsection, the safety ground shall be connected to the common grounding network.