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Subchapter 7. General Industry Safety Orders
Group 13. Cranes and Other Hoisting Equipment
Article 92. Cranes (Except Boom-Type Mobile Cranes)

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§4901. Brakes for Bridge and Swinging Motion.

(a) On cage-operated cranes with the cage mounted directly on the bridge girders, a foot brake to properly retard and stop the motion of the bridge shall be installed unless the bridge stops automatically when the power is cut off. This does not apply to underslung cab monorail cranes.

(b) Brakes for retarding the motion of the bridge shall be capable of retarding it at the rate of 1 foot per second per second while full load is being carried.

(c) The swinging or slewing mechanism on boom-type cranes shall be provided with a brake or lock having holding power in either direction. The lever operating this brake or lock shall have a device by which it can be secured in the holding position.

(d) On cab-operated cranes with the cab on the trolley, a trolley brake shall be required of sufficient size to stop the trolley within a distance in feet equal to 10 percent of full load speed in feet per minute when traveling at full speed with a full load.

(e) On cab-operated cranes with cab on trolley, a bridge brake of the holding type shall be required.

(f) If holding brakes are provided on bridge or trolley(s), they shall not prohibit the use of a drift point in the control circuit.

(g) On all floor, remote and pulpit operated crane bridge drives, a brake or noncoasting mechanical drive shall be provided.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. New subsection (f) filed 2-13-75; effective thirtieth day thereafter (Register 75, No. 7).

2. Amendment filed 7-17-75; effective thirtieth day thereafter (Register 75, No. 29).

3. Amendment of subsection (c) filed 8-29-86; effective thirtieth day thereafter (Register 86, No. 39).

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