WAC 296-96-24547. Drive machine brakes

All elevators shall be equipped with brakes that engage mechanically and release electrically. (1) Brakes shall be located on the final drive of all elevator machines; (2) The brake activating circuit shall be designed so that interruption of power by the slack cable switch, control switch, and limit switches disconnect power to the brake; (3) The brakes shall activate under short circuit, phase failure, or reverse phase conditions.