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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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§4912. Clearances.

(a) All travelling cranes, the supporting truck or wheels of which travel on rails on the ground, shall have at least 24 inches clearance between the crane and stationary structures or stacks or piles of materials. Where impracticable to obtain this clearance, such areas shall be guarded by guardrails or barricades to prevent access.

(b) If the runways of two cranes are parallel, and there are no intervening walls or structure, there shall be adequate clearance provided and maintained between the two bridges.

(c) Minimum clearance of 3 inches overhead and 2 inches laterally shall be provided and maintained between crane and obstructions.

NOTE: These clearances are only concerned with passage of the crane machinery past building structure.

(d) Where passageways or walkways are provided obstructions shall not be placed so that safety of personnel will be jeopardized by movements of the crane.

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


1. Amendment of subsection (a) and new subsections (b), (c) and (d) filed 2-13-75; effective thirtieth day thereafter (Register 75, No. 7).

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

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