398. Except where a mechanical device eliminating the need for ladders is used, any raise inclined at more than 50° from the horizontal and driven for a distance of more than 10 m (32.8 ft) shall be divided into at least 2 compartments, one of which shall be used for a travelway, be equipped with ladders in accordance with sections 67 and 68 and be separated from the other compartments by a partition, a protective grate or by another similar protective separation in order to prevent workers moving in the compartment from being hit by rocks or other matter coming from another compartment.
The timbering may never be more than 5 m (16.4 ft) from the active heading and before each blast, the upper opening of the compartment containing the ladders shall be closed and covered to prevent any rocks from falling into that compartment during the blast.
O.C. 213-93, s. 398; O.C. 782-97, s. 27; O.C. 460-2000, s. 28.