What minimum distance should be maintained from overhead power lines when operating a crane, and what steps should be taken near lines?

• A. 1 foot; keep working near lines anyway
• B. Ensure maximum clearance of 20 feet; ignore de-energizing
• C. Maintain the minimum safe clearance (commonly 10 feet or 3 meters for lines up to 50 kV); de-energize and ground lines if feasible and use a dedicated spotter to enforce clearance
• D. No specific distance; operate as needed

Answer: (C)

The key idea is to treat overhead power lines as a serious electrical hazard and keep a safe, defined distance from them during crane work. For lines up to about 50 kV, the commonly accepted minimum safe clearance is 10 feet (roughly 3 meters). This buffer reduces the chance of the crane boom or the load contacting the line or arcing if the equipment shifts or swings.

If possible, the safest approach is to de-energize and ground the lines before lifting. If de-energizing isn’t feasible, a dedicated spotter must be used to continuously monitor clearance and clearly communicate with the crane operator to ensure the limit isn’t crossed. The spotter’s presence helps catch movements that could reduce clearance due to wind, swaying, or load movement, which the operator alone might miss. Always plan the lift to keep the load and equipment well away from lines, and coordinate with the utility company for any necessary protections or temporary line relocation.

In short, maintain the minimum safe clearance (10 feet for lines up to 50 kV), de-energize and ground lines if feasible, and use a dedicated spotter to enforce the clearance when working near lines.