According to OSHA 29 CFR 1926.417, what is the minimum safe working distance from a 50kV overhead power line?
Correct Answer
B) 10 feet
OSHA requires a minimum 10-foot clearance from overhead power lines rated 50kV or below. Higher voltages require greater clearance distances to prevent electrical shock or arc flash incidents.
Why This Is the Correct Answer
OSHA 29 CFR 1926.417 specifically mandates a minimum 10-foot clearance from overhead power lines rated 50kV or below. This regulation is designed to protect workers from electrical hazards including shock, electrocution, and arc flash incidents. The 10-foot distance provides adequate safety margin for equipment operation and worker movement around energized lines. This is a fundamental safety requirement that general contractors must enforce on all job sites.
Why the Other Options Are Wrong
Option A: 5 feet
15 feet exceeds the minimum requirement for 50kV lines, though it would be safer - OSHA requires this distance for higher voltage lines (over 50kV).
Option D: 20 feet
5 feet is insufficient clearance and violates OSHA standards, creating serious risk of electrical contact and worker injury.
Memory Technique
Use '50-10 Rule': 50kV and below = 10 feet minimum. Think 'Fifty-Ten' as a paired concept for quick recall.
Reference Hint
OSHA Construction Standards 29 CFR 1926 Subpart K - Electrical, specifically section 1926.417 for overhead power line clearances
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