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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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§4889. Warning Devices.

(a) An audible warning device shall be mounted on each overhead traveling or bridge crane equipped with a power traveling mechanism, to warn persons in or near the path of crane travel.

Exception: Floor operated cranes whose movements are controlled by an operator through the use of controllers contained in a pendant station suspended from the crane.

(b) When starting the bridge and when the load or hook approaches personnel, the warning signal shall be sounded.

Exception: When an employee whose specific duties are to spot and direct crane operations who is in contact with the operator by signals, telephone, radio, etc.

(c) Cranes traveling on rails or rubber tires at ground level and operating in work areas shall be equipped with automatic warning devices to warn employees whenever the crane is traveling.

(d) Overhead traveling or bridge cranes equipped with a power traveling mechanism whose warning device has become inoperative shall not be operated until the warning device is repaired or replaced.

Exception: Temporary crane operation will be permitted if a spotter having a clear view of the crane load and operator is present whose specific duty is to warn those in the path of the crane or its load.

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


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

2. Amendment filed 8-29-86; effective thirtieth day thereafter (Register 86, No. 39).

3. Amendment of subsections (a) and (d) filed 12-5-2000; operative 1-4-2001 (Register 2000, No. 49).

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