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

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312.47. Auxiliary reserve: The auxiliary reserve referred to in subparagraph 2 of the second paragraph of section 312.46 must include,
(1)  for scuba diving, a complete diving breathing apparatus, including a half mask and a full cylinder, for each diver underwater;
(2)  for surface-supply diving, a breathing mixture reserve equal to 2.5 times the required quantity to allow each diver to ascend and undergo decompression; and
(3)  if a submersible compression chamber is used, a breathing mixture reserve that would allow the underwater work to be extended for 72 hours.
O.C. 425-2010, s. 3.