Electrical Hazards & Power Line Safety Flashcards
7 cards from real OSHA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical Hazards & Power Line Safety flashcards as text
What is the minimum safe approach distance required by OSHA for crane operations near power lines energized at 50 kV or less?
Answer: 10 feet
OSHA 29 CFR 1926.1408 requires a minimum clearance of 10 feet for power lines energized up to 50 kV.
Before beginning crane operations near overhead power lines, what must the crane operator or employer determine first?
Answer: The voltage of the power lines
The voltage must be determined first because minimum approach distances are calculated based on the power line's voltage level.
If a crane boom accidentally contacts an energized overhead power line, what should the crane operator do immediately?
Answer: Stay in the cab and call for emergency help
The crane cab acts as a Faraday cage; exiting creates a path for current through the operator's body to ground, so staying inside is safer until power is deenergized.
Which OSHA standard governs crane and derrick operations in construction, including power line safety requirements?
Answer: 29 CFR 1926.1400 (Subpart CC)
29 CFR 1926.1400 (Subpart CC), effective 2010, is the comprehensive OSHA standard governing cranes and derricks in construction including electrical hazard requirements.
What minimum clearance distance does OSHA require when crane operations are conducted near power lines energized between 350 kV and 1,000 kV?
Answer: 35 feet
OSHA 1926.1408 requires a minimum approach distance of 35 feet for power lines energized between 350 kV and 1,000 kV.
Which device can be installed on a crane to warn the operator when the equipment is approaching an energized power line?
Answer: Proximity alarm (warning device)
A proximity alarm (also called a proximity warning device) alerts the operator with an audible or visual signal when the crane is nearing the power line danger zone.
If the voltage of nearby overhead power lines cannot be determined, what minimum clearance distance must be maintained during crane operations?
Answer: 20 feet
OSHA 1926.1408(b) requires a minimum clearance of 20 feet when the voltage cannot be determined, to account for uncertainty.