California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 13 - Cranes and Other Hoisting Equipment
Article 92 - Cranes (Except Boom-Type Mobile Cranes)
Section 4902 - Boom Hoist Mechanisms

(a) When using recommended boom hoist reeving and with rated loads suspended, the boom hoist shall be capable of raising the boom, holding it stationary without attention from the operator, and lowering it only when coupled to its prime mover.

(b) The boom hoisting mechanism shall be provided with a suitable clutching or power engaging device permitting immediate starting or stopping of the boom drum motion. The boom hoisting mechanism also shall be provided with a self-setting safety brake, capable of supporting all rated loads, with recommended reeving.

(c) Brakes and clutches shall be provided with adjustments where necessary to compensate for wear and to maintain required force in springs where used.

(d) The boom hoisting mechanism shall be provided with an auxiliary ratchet and pawl or other positive locking device.

(e) The boom hoist drum shall have sufficient rope capacity to operate the boom at all positions from horizontal to the highest angle recommended when using the manufacturer's recommended reeving and rope size.

(f) The drum diameter shall be sufficient to provide a first layer rope pitch diameter of not less than 15 times the nominal diameter of the rope used.

(g) Automatic means shall be provided to stop boom drum motion when the maximum permissible boom angle is reached.

(h) The wearing surface of all brake drums or discs shall be smooth.