What is the minimum safe operating distance to a powerline energized with 600kV?

• A. 35 feet
• B. 20 feet
• C. 50 feet
• D. 15 feet

Answer: (A)

High-voltage clearance increases with voltage to prevent electrical arcing and shock. For a line energized at 600 kV, the established minimum safe operating distance is 35 feet. This allowance accounts for potential line sag, equipment movement, and environmental factors that could reduce effective clearance, giving a buffer to prevent flashover or contact if the crane or its components shift or extend toward the line. The smaller distances would not provide enough gap for a 600 kV line, while a distance like 50 feet is more than the standard minimum for this voltage. For lower voltages, smaller clearances are acceptable, which is why those options are too small for a 600 kV line.