CHST - Construction Health and Safety Technician Crane and Rigging Safety Questions and Answers Flashcards

What is the minimum safe distance a crane must maintain from energized power lines rated at 50 kV or below?

Answer: 10 feet

OSHA 29 CFR 1926.1408 requires a minimum 10-foot clearance from energized power lines up to 50 kV.

When a crane operator cannot see the load at all times, what must be done?

Answer: Use a signal person

OSHA requires a qualified signal person whenever the operator does not have a clear view of the load or path of travel.

A wire rope used for rigging shows more than __ broken wires in one lay length and must be removed from service.

Answer: 6

Six or more broken wires in one rope lay, or three or more in one strand, is a criterion for removal from service per ASME B30.9.

What document must be available in the cab or on the crane at all times during operations?

Answer: Manufacturer's load chart

OSHA 29 CFR 1926.1417 requires the load chart to be in the cab and legible so operators can verify capacity before any lift.

Which factor does NOT affect a crane's rated load capacity?

Answer: Operator's years of experience

Rated capacity is a mechanical/structural calculation based on boom angle, length, and configuration — operator experience is not a variable in the load chart.

During a critical lift, who must review and approve the lift plan?

Answer: A qualified person or licensed PE

Critical lifts require a pre-lift plan reviewed and approved by a qualified person, and in some jurisdictions a licensed professional engineer.

What is the purpose of a crane anti-two-block device?

Answer: It prevents the load block from contacting the boom tip

An anti-two-block (ATB) device stops the hoist when the load block gets too close to the sheave block, preventing catastrophic wire rope failure.