When a crane is operating around energized lines, what is required for employees on the ground regarding contact?

When a crane is operating around energized lines, it is mandated that employees on the ground may only make contact if they are protected by an equipotential zone. This requirement is critical for ensuring the safety of workers in the vicinity of high-voltage lines, as energized lines pose a significant risk of electrical shock or injury.

An equipotential zone is established to minimize the potential difference between various parts of the ground, which helps to prevent electrical currents from taking an unintended path through a person. This protective measure is essential for maintaining safety while working near energized components. By ensuring that all individuals within this zone have a uniform electrical potential, the risk associated with accidental contact with energized lines is significantly reduced.

The other options fail to provide adequate protection for employees. Allowing contact at all times or without grounding would expose workers to immediate danger. Similarly, stating that contact is not recommended but still allowed does not provide the necessary precautions to protect against electrical hazards. Hence, the most appropriate and safe practice is to ensure that contact occurs only within an equipotential zone.