OSHA 10-Hour Construction ReviewFocus Four HazardsMedium
A construction crew is working near overhead power lines that are energized and rated at 35 kV. According to OSHA, what is the minimum safe clearance distance that must be maintained between the equipment and the power lines?
- A10 feet
- B20 feet
- C25 feet
- D15 feet
Show answer & explanationAnswer & explanation
Correct answer: A. 10 feet
For energized power lines rated from 0.1 kV to 50 kV, OSHA requires a minimum clearance of 10 feet. This distance helps prevent accidental contact and electrocution.
Why the other options are wrong
- B. This is an excessive distance for 35 kV lines under normal circumstances.
- C. This is an excessive distance for 35 kV lines, not the minimum required.
- D. This distance is required for higher voltage lines or when the voltage is unknown and above 50 kV.
Overhead Power Line Clearance (< 50 kV)
OSHA requires a minimum 10-foot clearance between equipment and energized overhead power lines rated up to 50 kilovolts (kV).
- Clearance increases with higher voltages.
- Applies to all types of equipment (cranes, excavators, ladders).
- Contact with power lines is a leading cause of electrocution.
Memory trick: Power line's buzz, a 10-foot 'no touch' is a must.