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

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501. A junction box joining cables that carry energy at a voltage above 300 V may not be installed in a shaft or within 3.5 m (11.5 ft) of a shaft or on the timbering of a shaft station or a headframe.
Such a box shall be watertight when installed in a shaft for repairing or extending a cable.
O.C. 213-93, s. 501.