312.37. Thermal protection when diving: Diving in water whose temperature is higher than 40 °C is prohibited.
A diver must wear a controlled temperature suit in the following cases:
(1) when diving in water between 35 °C and 40 °C for more than 15 minutes; and
(2) when diving in water at 5 °C or colder for more than 90 minutes.
A diver must wear a variable volume dry suit in the following cases:
(1) when diving in water at 14 °C or colder for more than 15 minutes; and
(2) when diving in water at 5 °C or colder for 90 minutes or less.
The heating or cooling unit used to warm up or cool down the controlled temperature suit must be equipped with a temperature control and a hot or cold water reserve, as the case may be, to warm up or cool down the suit for the time required by the diver’s ascent in case of failure of the heating or cooling unit.
Water supplying a heating or cooling unit must not come from a contaminated environment.
A diver must wear a wet suit under the diving suit in the cases referred to in subparagraphs 1 and 2 of the second paragraph.
O.C. 425-2010, s. 3; O.C. 1104-2015, s. 4.