Maritime Occupational Health and Safety Regulations
(2) If an airborne hazardous substance or oxygen in the atmosphere in a confined space is maintained at the value, level or percentage referred to in subsection 172(2) by the use of ventilation equipment, a person may only be granted access to the confined space if
(a) the ventilation equipment is
(b) in the event of failure of the ventilation equipment, sufficient time will be available for the person to escape from the confined space before one of the following occurs:
(3) The employee referred to in subparagraph (2)(a)(ii) must activate an alarm in the event of faulty operation of the ventilation equipment.
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