What is the minimum clearance required between overhead power lines rated 50kV and construction equipment?
Correct Answer
C) 15 feet
OSHA requires 15 feet minimum clearance for power lines rated 50kV or below. This clearance protects against electrical arcing and ensures safe operation of construction equipment.
Why This Is the Correct Answer
OSHA 29 CFR 1926.1408 specifically mandates a minimum 15-foot clearance between construction equipment and overhead power lines rated 50kV or below. This clearance distance is critical for preventing electrical arcing, which can occur across air gaps when high voltage is present. The 15-foot requirement provides an adequate safety buffer to protect workers and equipment from electrocution hazards. This standard applies to all construction equipment including cranes, excavators, and other machinery that could potentially contact or come dangerously close to power lines.
Why the Other Options Are Wrong
Option A: 6 feet
10 feet is the minimum clearance required for power lines rated below 50kV (typically for lines up to 50kV), but the question specifically asks about 50kV lines which require the higher 15-foot clearance.
Option B: 10 feet
20 feet exceeds the OSHA requirement for 50kV lines, though it would be safer, it's not the minimum required clearance and represents unnecessary operational restrictions.
Option D: 20 feet
6 feet is insufficient clearance for 50kV power lines and would create an extremely dangerous situation where electrical arcing could easily occur, potentially causing electrocution or equipment damage.
Memory Technique
Remember 'Fifty-Fifteen' - 50kV and below needs 15 feet clearance. Think of it as 'half of fifty is twenty-five, minus ten equals fifteen.'
Reference Hint
OSHA 29 CFR 1926.1408 - Cranes and Derricks in Construction, Table A - Minimum Clearance Distances
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