What is the minimum distance any part of the crane or load may approach an energized power line under 50,000 volts during a proposed operation?

• A. 10 ft
• B. 20 ft
• C. 30 ft
• D. 40 ft

Answer: (B)

Maintaining a clearance between a crane or its load and an energized power line is about preventing electric shock and arcing. For lines up to 50,000 volts, the standard minimum distance is 20 feet. This gap provides a safe buffer to account for crane movement, load swing, wind, line sag, and any slight misalignment that could bring equipment closer than intended. Arcing can jump the air if the gap is too small, even without direct contact, so the 20-foot rule helps ensure that the crane, rigging, and load stay out of danger zones. Larger voltages require even greater clearances, but for this voltage level, 20 feet is the protective distance.