S-2.1, r. 14 - Regulation respecting occupational health and safety in mines

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145. If is prohibited to install an internal combustion engine other than a diesel engine at a distance of less than:
(1)  23 m (75.5 ft) from the building sheltering a hoist;
(2)  30 m (98.4 ft) from a surface opening of an underground mine or a building covering such an opening.
O.C. 213-93, s. 145.