S-2.1, r. 13 - Regulation respecting occupational health and safety
176. Interlocked protector: An interlocked protector equipped with an interlocking device shall have the following characteristics:
(1) it remains in place and is interlocked as long as the machine or its dangerous parts remain in operation;
(2) it makes it impossible to start the machine or to operate its dangerous parts for as long as it has not been restored to its place and reactivated;
(3) it does not cause the machine or its dangerous parts to be restarted once it is restored to its place and reactivated.