S-2.1, r. 13 - Regulation respecting occupational health and safety

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303. Combustible dusts: No worker may enter or be present in an enclosed area where there are combustible dusts posing a risk of fire or explosion unless the safety of the worker is ensured by the implementation of one of the following procedures:
(1)  by maintaining and controlling such dusts at a safe level;
(2)  by controlling existing ignition sources in the enclosed area associated with the training of the worker, by a qualified person, on the methods and techniques to be used for performing the work safely;
(3)  by making the atmosphere in the enclosed area inert, associated with the worker wearing the respiratory protective equipment specified in section 45 and the training of the latter in compliance with paragraph 2.
O.C. 885-2001, s. 303.