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

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486. No transformer room in an underground mine may be less than 15 m (49.2 ft) from the timbering of a shaft measuring the distance along the longitudinal axis of the travelways. In addition, there shall be at least 4.5 m (14.8 ft) of rock between a transformer and a shaft.
O.C. 213-93, s. 486.