What are some of the requirements for power-operated suspension scaffold hoists?
Power-operated hoists used to raise or lower a suspended scaffold must be tested by a qualified testing laboratory. [1926.451(d)(13)] The stall load of any scaffold hoist must not exceed three times its rated load. [1926.451(a)(5)] The stall load is the load at which the prime-mover (motor or engine) of a power-operated hoist stalls or the power to the prime-mover is automatically disconnected. [1926.450(b)] Gasoline power-operated hoists or equipment are not permitted. [1926.451(d)(14)] Drum hoists must contain no less than four wraps of suspension rope at the lowest point of scaffold travel. [1926.451(d)(6)] Gears and brakes must be enclosed. [1926.451(d)(15)] An automatic braking and locking device, in addition to the operating brake, must engage when a hoist makes instantaneous change in momentum or an accelerated overspeed. [1926.
