S-2.1, r. 4 - Safety Code for the construction industry

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8.7.1. The employer shall prepare a compartment reserved exclusively for the circulation of workers by means of ladders or stairs in:
(a)  any shaft over 30 m in depth;
(b)  a raise inclined more than 55º with respect to the horizontal and dug on a length of more than 18 m except when the equipment used allows safe access.
R.R.Q., 1981, c. S-2.1, r. 6, s. 8.7.1.