CAN CSA Z185-M87:2021 pdf download.Safety code for personnel hoists
Electrical protective device (switch) means a device that automatically causes the electric power to be removed from the drive machine motor and brake :
circuit under predetermined conditions independ-ently of the functioning of operating devices, and includes car and hoistway door contacts, car top emergency exit switch, emergency stop switch,compensating-rope-sheave switch, slack-rope device, final terminal stopping device, safety switch,governor overspeed switch, ground fault circuit interrupter, anti-piling switch and broken chain,slack or broken belt, or belt slippage sensing device.Hoist means a raising and lowering mechanism equipped with a car that moves in a substantially vertical direction, is used for carrying personnel or materials between two or more fixed levels, and includes its machine, mast, and hoistway.Cantilever hoist means a hoist in which the car travels on rails that are generally an integral part of the vertical mast and in a vertical plane out-board from the mast.
Dual rack and pinion hoist means a hoist with two machines, one mast, and two opposite mounted racks supporting two cars, and with each car operating as a single unit.
Car or counterweight safeties means mechanical devices attached to the car frame, or to an auxiliary frame, or to the counterweight frame, to stop and hold the car or counterweight ir case of predetermined overspeed or free fall, or f the hoisting ropes slacken.
Type A safeties means safeties that apply a rapidly increasing pressure on the guide rails during the stopping interval, the stopping distance being very short due to the inherent design of the safety. The operating force is derived entirely from the mass and the motion of the car or the counterweight being stopped. These safeties apply pressure on the guide rails through eccentrics, rollers, or similar devices, will-out any flexible medium purposely introduced to limit the retarding force and increase the stopping distance.
Type B safeties means safeties that apply a constant retarding force, or a gradually increasing retarding force, on the guide rals during the stopping interval, and that provide stopping distances that are related to the mass being stopped. Continuous tension in the governor rope may or may not be required to operate the safety during the entire stopping ,ntervat. Minimum and maximum stopping distances are specified on the basis of governcr tripping speed.
Type C safeties (Type A with oil buffers) means safeties that apply a retarding force dLring the compression stroke of one or more oil buffers interposed between the lower members of the car frame and a governor-operated Type A auxiliary safety plank applied on the guide rails. The stopping distance is equal to the effective stroke of the buffers.CAN CSA Z185-M87 pdf download.