§ 7.379. Drum hoists.
(a) Exposed moving parts such as gears, projecting screws, setscrews, chain, cables, chain sprockets and reciprocating or rotating parts, which constitute a hazard, shall be guarded.
(b) All controls used during the normal operation cycle shall be located within easy reach of the operator’s station.
(c) Electric motor operated hoists shall be provided with the following:
(1) A device to disconnect all motors from the line upon power failure and not permit any motor to be restarted until the controller handle is brought to the ‘‘off’’ position.
(2) Where applicable, an overspeed preventive device.
(3) A means whereby remotely operated hoists stop when any control is ineffective. The driving machine drum or sheave is equipped with an electrically released, spring-applied brake, operating on a brake drum directly connected to the drum or drum shaft, and having a capacity sufficient to stop and hold the car at not less than 125% of its rated load when applied at a speed of 125% of rated speed.
A speed control device is provided and operated by the drum, which will cause the application of the drum brake and removal of power from the driving machine motor if the speed of the drum exceeds that corresponding to 125% of a rated car speed. Where the speed control device is chain driven from the drum, a broken chain switch shall be provided.
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