Equipment will operate near an overhead power line energized at 50 kV or less. What MINIMUM clearance must be maintained between the line and any part of the equipment or load, absent other controls?

Explanation

Correct: for lines up to 50 kV, a minimum clearance of 10 feet must be kept between the energized line and equipment or load; the required distance increases for higher voltages. 6 ft and 3 ft are unsafe undershoots for power lines, and 15 ft, while more conservative, is not the baseline minimum for lines at or below 50 kV.