Current through Register Vol. 54, No. 50, December 14, 2024
Section 7.347 - Safety requirements(a) No single-belted or chain-driven dumbwaiter shall have a car speed in excess of 50 feet per minute. No new power-driven dumbwaiter shall be operated by hand rope control.(b) New power-driven dumbwaiter machines of the winding drum type shall be equipped with an automatic terminal stop which automatically cuts off the source of power and applies the brake. Limit switches may be used in lieu of machine automatics.(c) Dependable brakes shall be provided for all dumbwaiters.(d) A slack cable device shall be provided on newly installed dumbwaiters of the winding drum type above a car travel of 30 feet and a capacity of 100 pounds. Such device shall automatically stop the machine and apply the brake in the event of broken or slack hoisting cables.(e) The removal and reerection of any dumbwaiter in a new location shall be in conformity with the requirements for new installations.(f) When the space below the hoistway of new installations is used for a passageway or is occupied by persons, or if unoccupied is not secured against unauthorized access, cars and counterweights shall be provided with safeties which operate on the breaking of the suspension means.(g) Pushbuttons shall not be permitted to control the operation of any dumbwaiter in school buildings, sanitariums for the weak-minded, and similar classes of buildings if there is danger of abuse of the purpose of such buttons, unless the pushbuttons may be made inaccessible to the occupants or are key operated. A decision on this point will be made at the time of the approval of the plans for the dumbwaiters.