When is it essential to use a signalman while cranes work near overhead power lines?

Using a signalman while cranes work near overhead power lines is particularly critical when a boom swings within the limit of approach to those lines. The limit of approach refers to the minimum distance that must be maintained between the crane's boom or load and the power lines to ensure safety.

When the boom is within this limit, it poses a significant risk of making contact with the power lines, which can lead to dangerous electrical hazards, including electrocution. Having a signalman on site serves as an important safety measure; they can provide clear and constant communication to the crane operator regarding the crane's position in relation to the overhead lines. This reduces the risk of accidents and enhances overall workplace safety.

In situations where the crane is operating further from the power lines or in contexts where the lines are not a concern, the need for a signalman may be less critical. However, when working close to these lines, especially with a potential for swinging movements, the presence of a trained signalman becomes essential to maintain safe operations.