National Commission for the Certification of Crane Operators (NCCCO) Mobile Crane Practice Exam

What is the minimum clearance required when in transit under power lines of 350 KV?

1. 10 FT

2. 12 FT

3. 14 FT

4. 16 FT

The correct answer is: 16 FT

When operating a mobile crane or any equipment under high voltage power lines, maintaining a minimum clearance is crucial for safety to prevent electrical hazards. The National Electrical Safety Code (NESC) and various safety guidelines recommend specific clearance distances based on the voltage of the power lines. For 350 KV power lines, the minimum clearance required is typically 16 feet. This distance helps ensure that there is a safe margin to prevent electrical arc incidents, particularly in adverse weather conditions where the distance between the equipment and the power lines could become a safety risk. This particular distance takes into account not only the voltage level but also factors like weather, equipment sway during operation, and the potential for the crane to move unexpectedly. Ensuring a 16-foot clearance helps protect workers operating near high-voltage areas, reducing the risk of serious electrical injuries or fatalities. By adhering to this safety standard, operators and companies can fulfill their responsibility to maintain safe work practices.