§ 7.343. Landing doors and gates.
(a) All installations. Shaftway entrances shall be provided with approved gates or doors, which may be of the vertical-sliding or rolling semiautomatic type or of the swinging hinged type. When shaftways are required to be of fire-resistive construction, fire doors shall be provided at all landings. Landing doors and gates shall be equipped with an effective lock or latch. The openings at shaftway entrances shall in no instance be greater than the width and height of the car. Larger openings are permitted, if they are limited to the car size by bolted transoms or side panels.
(b) New installations. The shaftway landing doors of power-driven dumbwaiters shall be provided with a locking device which prevents the normal operation of the car so long as any door or doors are in an opened position. Such locking device shall also lock the door or doors on the shaftway side while the car is not at the landing.
(c) Existing installations. The shaftway landing doors of power-driven dumbwaiters, except of the automatic control type, shall be self-closing.
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