NCCCO Hazard Identification and Power Line Safety

Question 1

Under OSHA 1926.1408, what is the minimum required clearance when operating a crane near an energized power line rated at 50 kV or less?

Accepted Answer

10 feet

Answer

OSHA 1926.1408 Table A specifies a minimum 10-foot clearance for lines up to 50 kV unless the line is de-energized and grounded, or an insulating link is used.

Question 2

Before any crane operation near power lines, the employer must attempt to determine the voltage of the lines. If the voltage cannot be determined, what clearance applies?

Accepted Answer

10 feet minimum until the utility confirms the voltage

Answer

OSHA 1926.1408(b) states that if the voltage cannot be determined, the minimum 10-foot clearance in Table A applies until the utility owner confirms the actual voltage.

Question 3

Which hazard recognition step is required when a crane must work within the Table A distances of a power line?

Accepted Answer

Contact the utility owner and obtain written confirmation of voltage and whether de-energizing is feasible

Answer

OSHA 1926.1407 requires the employer to contact the utility before encroaching on Table A distances to discuss de-energizing, insulating, or relocating the line.

Question 4

If a crane boom accidentally contacts a power line and the crane becomes energized, what should bystanders on the ground do?

Accepted Answer

Stay away and not touch the crane or any grounded object near it

Answer

When a crane contacts a power line, ground current can radiate outward. Anyone touching the crane or standing close can complete a circuit and be electrocuted. Bystanders must stay clear until the utility cuts power.

Question 5

Under OSHA 1926 Subpart CC, which person is responsible for identifying power line hazards before crane setup begins?

Accepted Answer

The employer or competent person conducting the hazard assessment

Answer

OSHA 1926.1402 requires the employer to assess the site for power line hazards before equipment is assembled or used. A competent person typically conducts this assessment.

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