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S-2.1, r. 13 - Regulation respecting occupational health and safety
Section 320
Disposition versions
320. Ground: A portable welding machine powered by an internal combustion engine shall be grounded if it is equipped with auxiliary 120 V or 240 V plugs and if these plugs are used at the same time as the welding process.
However, such grounding is not necessary if the tools, appliances or accessories connected to the auxiliary plugs are equipped with double insulation or a third conductor ensuring the continuity of the grounding, or if the branch circuits are protected by Class A ground fault circuit interrupters.
