(a) Elevators and dumbwaiters shall be maintained so as to be free from physical and fire hazards.
(b) Elevator and power operated dumbwaiter cars shall be provided with durable signs in conspicuous locations on which the rated capacity shall be indicated.
(c) Elevator cars shall be provided with approved means for transmitting a signal outside the hoistway in case of emergency.
(d) Hoistways and pits shall be maintained free of refuse.
(e) Machine rooms shall be maintained free of oil and grease and shall not be used for storage of articles or materials unnecessary for the maintenance of the elevator or dumbwaiter. Flammable liquids shall not be kept in such rooms.
(f) No person shall at any time make any required safety device or electrical protective device inoperative, except where necessary during tests, inspections or maintenance.