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Subchapter 7. General Industry Safety Orders
Group 13. Cranes and Other Hoisting Equipment
Article 93. Boom--Type Mobile Cranes

§4924. Load Safety Devices.

(a) All cranes having a maximum rated capacity exceeding one ton shall be equipped with safety devices as provided herein.

Exceptions:

1. Boom-type excavators used in excavation work and all equipment when configured for pile driving or log handling.

2. Articulating boom cranes are exempt from the provisions of subsection (c).

3. Digger derrick trucks designed, built and maintained in accordance with ANSI/ASSE A10.31 standards for "Construction and Demolition Operations -- Safety Requirements, Definitions and Specifications for Digger Derricks".

(b) All mobile cranes including truck-mounted tower cranes having either a maximum rated boom length exceeding 200 feet or a maximum rated capacity exceeding 50 tons shall be equipped with a load indicating device or 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.

(1) All other mobile cranes manufactured after September 27, 2005, with a maximum rated capacity exceeding 3 tons shall be equipped with a load indicating device, load moment device, or a device that prevents an overload condition.

Exception: When installed load indicating devices are not functional, a qualified person shall determine load weights until the device is restored to operation.

(2) Load indicating devices shall be repaired in accordance with the manufacturer's recommendations.

(c) Mobile cranes shall be provided with a boom angle or radius indicator which clearly shows the boom angle or radius distance to the operator at all times.

Exception: When a boom angle or radius indicator is inoperative or malfunctioning, a qualified person shall determine the radius or boom angle by measurement until the indicator is restored to operation.

(1) Boom angle or radius indicators shall be repaired in accordance with the manufacturer's recommendations.

(d) Anti-two-block prevention and warning features.

(1) Telescopic boom cranes manufactured after February 28, 1992, shall be equipped with an anti-two-block device or two-block damage prevention feature for all points of two-blocking.

(2) Lattice boom cranes manufactured after February 28, 1992, shall be equipped with a device which automatically prevents damage and load failure from contact between the load block, overhaul ball, or similar component, and the boom tip (or fixed upper block or similar component). The device(s) shall prevent such damage/failure at all points where two-blocking could occur.

(3) Lattice boom derricks manufactured after November 8, 2011, shall be equipped with a device which automatically prevents damage and load failure from contact between the load block, overhaul ball, or similar component, and the boom tip (or fixed upper block or similar component). The device(s) shall prevent such damage/failure at all points where two-blocking could occur.

Exception: The requirements of subsections (d)(2) and (d)(3), do not apply to lattice boom cranes when used for dragline, clamshell (grapple), magnet, and drop ball work.

(4) Articulating boom cranes manufactured after August 30, 2001, equipped with a load hoisting device (winch) shall be equipped with a two-block damage prevention feature.

(e) Spirit levels, or equivalent, shall be provided to indicate the level of the crane fore and aft and across the width.

Credits

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

History

1. Amendment of subsection (a) filed 5-16-75; effective thirtieth day thereafter (Register 75, No. 20).

2. Amendment of subsection (c) filed 11-28-75; effective thirtieth day thereafter (Register 75, No. 48).

3. Amendment filed 2-6-76; effective thirtieth day thereafter (Register 76, No. 6).

4. Amendment of subsection (a) filed 7-6-79; effective thirtieth day thereafter (Register 79, No. 27).

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

6. Amendment of Exception to subsection (a) filed 4-16-93; operative 5-17-93 (Register 93, No. 16).

7. Editorial correction of History 2 (Register 97, No. 23).

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

9. Amendment filed 7-17-2008; operative 8-16-2008 (Register 2008, No. 29).

10. Amendment of subsections (c) and (d)-(d)(2), new subsection (d)(3), subsection renumbering and amendment of Exception filed 7-26-2022; operative 7-26-2022 pursuant to Government Code section 11343.4(b)(3) (Register 2022, No. 30). Filing deadline specified in Government Code section 11349.3(a) extended 60 calendar days pursuant to Executive Order N-40-20 and an additional 60 calendar days pursuant to Executive Order N-71-20.

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