NCCCO Power Line Hazard Identification and Safety Procedures 2

Question 1

What is the minimum approach distance required for power lines with unknown voltage under OSHA 29 CFR 1926.1408?

Accepted Answer

10 feet (3.0 m)

Answer

OSHA 29 CFR 1926.1408 requires a minimum 10-foot approach distance for all power lines with unknown or unverified voltage up to 50 kV.

Question 2

Before beginning crane operations near power lines, what is the operator's first required action under OSHA standards?

Accepted Answer

Determine if any part of the equipment could come within the minimum approach distance

Answer

OSHA requires operators to first determine whether any part of the crane or load could come within the minimum approach distance before operations begin.

Question 3

What is the role of a spotter during crane operations near power lines?

Accepted Answer

To observe crane and load position relative to power lines and warn the operator of approaching hazards

Answer

A spotter's role is to observe the crane's position relative to power lines and provide continuous warnings to the operator to prevent encroachment into minimum approach distances.

Question 4

What electrical phenomenon can injure ground workers even without direct contact with an energized crane?

Accepted Answer

Step potential and touch potential from current flowing through the ground

Answer

When a crane contacts a power line and current flows to ground, step potential creates voltage differences in the soil that can electrocute workers standing on the ground near the crane.

Question 5

What action must be taken if a crane boom makes contact with a power line?

Accepted Answer

The operator stays in the cab; all ground workers evacuate to a safe distance until the line is de-energized

Answer

When a crane contacts an energized power line, the operator must stay inside the cab (the safest location) while all ground personnel immediately evacuate to a minimum 100-foot safe distance.

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

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

NCCCO Power Line Hazard Identification and Safety Procedures 2