S-2.1, r. 13 - Regulation respecting occupational health and safety
175. Interlocking protector: A protector equipped with an interlocking device shall have the following features:
(1) it causes the stoppage of the machine or of the operation of its dangerous parts when it is moved;
(2) it makes it impossible to start the machine or to operate its dangerous parts for as long as it is being moved;
(3) it does not cause the machine or its dangerous parts to be restarted once it is restored to its place.