NCCCO Hazard Identification and Power Line Safety 2

Question 1

Under OSHA 29 CFR 1926 Subpart CC, what is the minimum required clearance distance between a crane and an energized power line of unknown voltage?

Accepted Answer

20 feet from any part of the crane or load

Answer

OSHA 1926.1408 requires a minimum clearance of 20 feet from energized power lines when the voltage is unknown, until a qualified electrical engineer determines the actual voltage and appropriate clearance.

Question 2

What procedure should a crane operator follow if the crane makes contact with an energized power line?

Accepted Answer

Stay in the cab, warn bystanders not to touch the crane, and attempt to move the crane away from the power line

Answer

If the crane contacts an energized power line, the operator should stay in the cab (the safest location), warn all ground personnel to stay away, and try to move the crane away from the line if possible without endangering others.

Question 3

What is an 'encroachment permit' in the context of crane operations near power lines?

Accepted Answer

A written authorization from the power line owner/operator to work within the established clearance distance

Answer

An encroachment permit is written authorization from the owner/operator of the power line allowing the crane to operate within the standard minimum clearance distance under specified control conditions.

Question 4

During a pre-lift site assessment, an operator identifies underground utilities in the crane's planned setup area. What should the operator do?

Accepted Answer

Contact the utility locating service (such as 811 in the US) to have utilities marked before positioning the crane

Answer

Before positioning a crane, all underground utilities must be identified and marked through the appropriate utility locating service (e.g., 811 in the US) to prevent damage during setup and assess the ground's ability to support crane loads.

Question 5

What is the purpose of an 'insulating link' (insulator) installed between the crane hook and the load during operations near power lines?

Accepted Answer

It breaks the electrical circuit path from the crane to the load, reducing the risk of shock to ground personnel if the crane contacts a power line

Answer

An insulating link installed between the hook and the load interrupts the electrical path from the crane to the load, so ground personnel handling the load are not electrocuted if the crane contacts a power line.

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO Hazard Identification and Power Line Safety 2