Electrical circuits

(1) All electrical circuits connected to projectors or projector equipment shall be so arranged that failure in any part of them shall not affect the working of the general lights and the safety lights. (2) Such circuits shall be controlled by means of a switch or switches, installed in the projection room in a position readily accessible to the operator or operators. (3) When the general lights and the safety lights are controlled from within the projection room, there shall be separate and independent means of control outside of and away from the projection room in a position readily accessible to members of the staff but not to the public.