Canada Occupational Health and Safety Regulations

18.50 Every employer shall ensure that a hyperbaric chamber meeting the requirements of CSA Standard CAN/CSA Z275.1-93, Hyperbaric Facilities, published in English in December 1993 and in French in January 1995, as amended from time to time, for Class A (double-lock type) hyperbaric chambers, is available and in operable condition whenever

• (a) a decompression dive is occurring; or

• (b) the depth of a dive is to exceed 40 m.