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
Can insulating links or proximity warning devices replace the minimum approach distance requirement?
Answer: No — they provide additional protection but do not replace minimum distance requirements
Insulating devices and warning systems add safety layers but are NOT substitutes for maintaining minimum approach distances. OSHA treats them as supplemental, not replacement, measures.
What voltage should all power lines be assumed to carry if the actual voltage is unknown?
Answer: Over 350 kV until the utility company confirms the actual voltage
Unknown voltage lines must be treated as 350+ kV, requiring 50-foot minimum clearance. Only the utility company can confirm the actual voltage and allow reduced clearance distances.
Power lines appear to be de-energized (no visible signs of power). Is it safe to work closer?
Answer: No — power lines must always be treated as energized unless confirmed de-energized and grounded by the utility company
Power lines can be energized without visible signs. Only the utility company can confirm de-energization AND ensure proper grounding. Until then, treat all lines as energized and maintain full clearance.
What is the danger zone created when a crane's boom swings near power lines?
Answer: The entire arc of the boom's swing path, including the load and rigging at maximum radius
The danger zone includes every point the boom tip, load, rigging, and tag lines can reach as the crane swings. This entire arc must maintain minimum clearance from power lines.
During a crane-to-power line contact incident, a ground worker feels tingling in their feet. What should they do?
Answer: Shuffle with small steps or hop with feet together away from the crane — never take normal steps
Shuffling (keeping feet close together) or hopping (feet together) minimizes the step potential between your feet. Normal walking creates a large step, increasing the voltage differential through your body.
What pre-work planning is required when crane work will occur within the power line's minimum approach distance?
Answer: No work can occur within the minimum approach distance
When work must occur within minimum approach distances, the lines must be de-energized and visibly grounded by the utility company. This is the only way to safely work within the restricted zone.