What is true regarding the requirement of a connection to earth when using equipotential grounding?

Equipotential grounding is a safety practice used in electrical installations to ensure that all conductive parts are kept at the same potential to eliminate the risk of electric shock. Regarding the requirement for a connection to earth, it is identified that it is sometimes required.

This is due to various factors, including the specific application of the equipment, the environment in which it operates, and relevant electrical codes or standards that may dictate requirements for grounding. For instance, certain systems and installations might not mandate an earth connection in scenarios where the design inherently minimizes the risk of electrical shock or where other safety measures are in place.

Additionally, the actual need for an earth connection can hinge upon the type of transient over-voltages expected, the classification of the electrical installation, and local regulations. These elements create a framework where the necessity of an earth connection is determined rather than being a blanket requirement, leading to the conclusion that it is sometimes required based on varying conditions.