According to ASME B30.5, what is the prohibited zone for power lines that are 60kV?

The correct answer is based on safety regulations outlined in ASME B30.5, which governs the operation of mobile and tower cranes, particularly concerning their interactions with power lines. For power lines that carry up to 60kV, the standard requires that a minimum distance of 15 feet be maintained to ensure the safety of personnel and equipment. This distance is essential to prevent accidental contact with overhead power lines, which can pose significant hazards, including electric shock or electrocution.

The rationale for establishing this 15-foot prohibited zone is to provide a safe working distance that accounts for potential swing or movement of the crane, as well as any slack in the power line. This safety measure is critical in preserving the well-being of workers on site, and it reflects industry best practices for reducing electrical hazards during crane operations. Following these guidelines helps to mitigate risks when conducting lifting operations near power lines.