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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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§4907. Capacity Marking and Load Indication.

(a) The maximum rated load of all bridge or fixed radius cranes shall be plainly marked on each side of the crane, and if the crane has more than one hoisting unit, each hoist shall have marked on it or its load block its rated capacity, and this shall be clearly legible from the ground or floor.

(b) Each variable radius boom-type crane shall be equipped with a boom angle or a boom radius indicator and a clearly legible load rating chart in clear view from the operator's position.

(1) Cranes having a boom exceeding 60 feet in length or a maximum rated capacity exceeding 15 tons shall be provided with an approved boom angle indicator which clearly shows the boom angle in degrees to the operator at all times. The indicator shall give a clear visual warning signal before high or low unsafe boom angles are reached. The indicator shall be mounted in the cab, adjustable and under control of the operator at all times, and a visual inspection of the indicator shall be made each day by the operator to see that it is properly functioning.

(2) Cranes having either a maximum rated boom exceeding 200 feet or a maximum rated capacity exceeding 50 tons shall be equipped with a load indicating device, a load moment device, or a device that prevents an overload condition. Only approved devices as defined in the General Industry Safety Orders, Section 3206 shall be used.

(3) When a load indicating device or alternative system is so arranged in the supporting system (crane structure) that its failure could cause the load to be dropped, its strength shall not be the limiting factor of the supporting system (crane structure).

(4) All load indicating devices shall be operative over the full operating radius. Overall accuracy shall be based on actual applied load and not on full scale (full capacity) load.

(5) When the device uses the radius as a factor in its use or in its operating indications, the indicated radius (which may be in feet and/or meters, or degrees of boom angle, depending on the system used) shall be a figure which is within the range of a figure no greater than 110 percent of the actual radius to a figure which is no less than 97 percent of the actual (true) radius. A conversion chart shall be provided whenever it is necessary to convert between degrees of radius and feet or meters.

(c) If change-speed gear is used on the lifting motion, the rated load for each speed shall be similarly indicated.


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


1. New subsections (b)(3)-(b)(5) filed 12-12-84; effective thirtieth day thereafter (Register 84, No. 50).

2. Amendment of subsections (b) (1) and (2) filed 8-29-86; effective thirtieth day thereafter (Register 86, No. 39).

3. Amendment of subsection (b)(2) filed 1-3-2002; operative 2-2-2002 (Register 2002, No. 1).

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