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

Section 8.3.1 Disposition versions

2012-09-01

8.3.1. The concentration of impurities in the air shall be kept at less than the permissible values indicated in Schedule I to the Regulation respecting occupational health and safety (chapter S-2.1, r. 13). The underground site shall be supplied with fresh air. The minimum volume of air must be equivalent to the greatest of the following requirements:

(a)  5.5 m3 per minute of fresh air for each worker underground;

(b)  15 m3 of fresh air per minute for each square metre of section for tunnels; or

(c)  where there is mobile equipment driven by a diesel engine:

i.  certified by the National Institute for Occupational Safety and Health (NIOSH), the supply of fresh air shall be based on the values given in Schedules 24 and 31 of that Institute;

ii.  certified by the Department of Energy, Mines and Resources of Canada, the supply of fresh air shall be that specified at the time of certification of the equipment; or

iii.  not certified, the fresh air supply shall correspond to a minimum rate of 5.5 m3 per minute per kilowatt measured at the motor shaft and the total quantity of fresh air necessary when several of these machines are in operation at the same time shall be:

(A)  100% of the given supply for the most stringent unit from the point of view of ventilation;

(B)  75% of the given supply for the second unit; and

(C)  50% of the given supply for each additional unit;

(d)  the fresh air supply, as specified in paragraphs a, b and c shall be increased where applicable until the concentration of impurities in the air is reduced to the permissible value indicated in Schedule I to the Regulation respecting occupational health and safety.

R.R.Q., 1981, c. S-2.1, r. 6, s. 8.3.1; O.C. 885-2001, s. 377.