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Subchapter 4. Construction Safety Orders
Article 7. Bins, Bunkers, Hoppers, and Material Storage

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§1548. Bins, Bunkers, and Hoppers.

(a) Every open bin, bunker, hopper, and dangerous equipment whose upper edge is less than 36 inches above the floor or working level shall be equipped with a standard railing around its edges, or a grating or grille shall cover the top. Where grille or grating is the only protection, it shall have no opening whose least dimension exceeds 10 inches. Where railings are used they may be temporarily removed to provide necessary working openings.

(b) The grating or grille shall be of strength sufficient to withstand any load that is customarily imposed upon it.

(c) Where bins, bunkers, or hoppers are loaded by backing an automotive truck to one edge, there shall be installed bumper stops not less than 10 by 10 inches, securely fastened in a manner to prevent the truck overrunning the runway. At least 8- by 8-inch timbers or equivalent shall be securely fastened along the sides of the runway to prevent a truck overrunning the sides of the runway.

(d) Open Top Bins.

(1) Where employees are permitted or required to work in or above open top bins over 8 feet in depth, an upper working area consisting of a platform or walkway shall be provided, and shall be guarded with a standard railing and toeboard.

(2) Personal fall arrest or restraint systems complying with the requirements of Section 1670 shall be provided and used by employees when above requirements are not met.

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


1. Amendment of subsections (a), (d)(1) and (2) filed 4-11-84; effective thirtieth day thereafter (Register 84, No. 15).

2. Amendment of subsections (a) and (d)(2) filed 7-30-97; operative 8-29-97 (Register 97, No. 31).

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