What is a requirement for using equipotential zones?

Using equipotential zones is a safety practice designed to reduce the risk of electric shock when working around electrical installations. The correct choice indicates that these zones can only be used on deenergized lines. This is essential because equipotential zones work by controlling the voltage potential differences in a given area; the entire zone is grounded to minimize electrical hazards.

When lines are energized, there is a risk of voltage present that can lead to dangerous situations for personnel. Therefore, equipotential zones must only be utilized in circumstances where equipment has been deenergized and properly locked/tagged out, ensuring that workers can operate safely without the risk of electrical hazards. Knowing that these zones are only applicable in deenergized scenarios helps ensure the safety of personnel in electrical environments.