NCCCO Hazard Identification and Power Line Safety 4

Question 1

When a crane is operating near energized power lines and the boom inadvertently contacts the line, what should the operator do FIRST?

Accepted Answer

Stay in the cab and sound the horn to warn others

Answer

The operator should remain in the cab (the safest place) and sound the horn to warn ground personnel to stay clear, then contact the utility company.

Question 2

Under OSHA 1926.1408, what is the minimum approach distance for a crane operating near power lines rated between 50 kV and 200 kV?

Accepted Answer

15 feet

Answer

For lines rated 50 kV to 200 kV, OSHA requires a minimum approach distance of 15 feet.

Question 3

A 'spotter' assigned to monitor power line clearance during crane operations should be positioned where?

Accepted Answer

At a location with a clear view of the power line and the crane's boom

Answer

The spotter must be positioned where they can clearly see both the power line and the crane components to accurately judge clearance distances.

Question 4

What does the term 'step potential' refer to in the context of crane-power line contact incidents?

Accepted Answer

The difference in ground voltage between two points a step apart near an energized object

Answer

Step potential is the voltage difference between two ground points a step apart, which can electrocute a person walking near an energized object touching the ground.

Question 5

When planning a lift near power lines and the utility company cannot de-energize the lines, what is the next required action per OSHA?

Accepted Answer

Establish and use a minimum approach distance based on voltage

Answer

If de-energizing is infeasible, OSHA requires determining the line voltage and establishing an appropriate minimum approach distance for the crane to maintain.

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 4