(a) The doors of automatic elevators should be equipped with
interlocking switches so arranged that the elevator car will be immovable
while any door is opened or unlocked, and arranged so that such door or
doors cannot be inadvertently opened when the elevator car is not at a
landing.
(b) A "Stop" switch should be provided in the automatic elevator
compartment that will permit the elevator to be stopped at any location in
the shaft.
(c) A slack cable device should be used where appropriate on
automatic elevators which will automatically shut-off the power and apply the
brakes in the event the elevator is obstructed while descending.
(d) Each automatic elevator should be provided with a telephone or
other effective communication system by which aid or assistance can be
obtained promptly.
