S-2.1, r. 13 - Regulation respecting occupational health and safety
33.1. Cases where workers must be protected: Workers shall be protected against falls in the following cases:
(1) if they are at risk of falling more than 3 m unless they are only using a means of access or exit;
(2) if they are at risk of falling
(a) into a liquid or dangerous substance;
(b) on a moving component;
(c) on equipment or material that constitute a danger;
(d) from a height of 1,5 m or more in a well, a basin, a tank, a reservoir, a vat, a container for the storing or mixing of substances, or where the workers are handling a load.