When is a signal person required according to ASME B30.3 when working near power lines?

A signal person is required according to ASME B30.3 when the crane moves within a boom's length of power lines to ensure safety and prevent accidents. This requirement acknowledges the inherent risks associated with working near electrical hazards. When a crane is operating in close proximity to power lines, there is a significant chance that the boom or any attached loads could inadvertently come into contact with these lines, which can lead to serious injuries or fatalities due to electrical shock or arcs.

The presence of a signal person in such scenarios is crucial as they can provide clear, real-time communication between the crane operator and the worksite, helping to maintain a safe distance from the power lines. Their role is to watch for hazards that the operator may not see, ensuring that all movements are conducted safely and in accordance with safety protocols.