Canada Occupational Health and Safety Regulations

13.4 (1) Subject to subsection (2), all portable electric tools used by employees shall be grounded.

(2) Subsection (1) does not apply to tools that

• (a) are powered by a self-contained battery;

• (b) have a protective system of double insulation; or

• (c) are used in a location where reliable grounding cannot be obtained if the tools are supplied from a double insulated portable ground fault circuit interrupter of the class A type that meets the standards set out in CSA Standard C22.2 No. 144-1977, Ground Fault Circuit Interrupters, dated March, 1977.