When must tag lines be used during personnel platform signaling under OSHA 1926.1431?

Tag lines are an important safety measure during personnel platform lifting operations because they allow for better control of the platform being lifted. According to OSHA standards, tag lines must be used when necessary to control the personnel platform; this is particularly relevant when the load is moving or when environmental conditions, such as wind, may impede safe operation.

Using tag lines enhances the stability and safety of the platform, allowing the signal person to communicate with the crane operator while ensuring that the platform remains steady and predictable during movement. Therefore, the correct answer underscores the importance of utilizing tag lines as needed to prevent accidents and ensure safe lifting practices, without requiring their use under all circumstances. This flexibility is crucial in adapting to the specific requirements of each lifting situation.