Power Line Hazard Identification and Safety Procedures Flashcards
6 cards from real NCCCO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Power Line Hazard Identification and Safety Procedures flashcards as text
What is the minimum approach distance required for power lines with unknown voltage under OSHA 29 CFR 1926.1408?
Answer: 10 feet (3.0 m)
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.
Before beginning crane operations near power lines, what is the operator's first required action under OSHA standards?
Answer: Determine if any part of the equipment could come within the minimum approach distance
OSHA requires operators to first determine whether any part of the crane or load could come within the minimum approach distance before operations begin.
What is the role of a spotter during crane operations near power lines?
Answer: To observe crane and load position relative to power lines and warn the operator of approaching hazards
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.
What electrical phenomenon can injure ground workers even without direct contact with an energized crane?
Answer: Step potential and touch potential from current flowing through the ground
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.
What action must be taken if a crane boom makes contact with a power line?
Answer: The operator stays in the cab; all ground workers evacuate to a safe distance until the line is de-energized
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.
Under what conditions may crane operations continue within the normal minimum approach distance to a power line?
Answer: When the utility owner has de-energized and visibly grounded the line or when all required engineering controls are in place
Crane operations within minimum approach distances are only permitted when the utility owner has de-energized and visibly grounded the power line, or when all required OSHA engineering controls are implemented.