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

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3.21.2. In confined spaces, the employer must take the contaminant concentration readings mentioned in subparagraph e of the first paragraph of section 3.21.1 and make sure that no worker, even when wearing protective breathing equipment, enters a confined space containing or which may contain:
(a)  oxygen in a proportion lower than 19.5% or higher than 23%;
(b)  flammable gas or vapour with a concentration higher than 25% of the lower explosion limit;
(c)  contaminants in the air with a concentration higher than the threshold limit values mentioned in Schedule I to the Regulation respecting occupational health and safety (chapter S-2.1, r. 13);
(d)  any other contaminant in a concentration which could be hazardous to a workman’s health.
O.C. 1959-86, s. 28; O.C. 885-2001, s. 377.