What is the purpose of ground-fault protection for equipment in electrical services rated over 150V?

Ground-fault protection for equipment in electrical services rated over 150V is primarily designed to protect personnel from electric shock. When a ground fault occurs, it indicates that electricity is unintentionally flowing through an unintended path, which could potentially include a person's body. The ground-fault protection devices quickly detect these anomalies and interrupt the current flow, reducing the likelihood of serious injury or fatality due to electric shock.

While ground-fault protection may also have other benefits, such as reducing fire risks by minimizing the possibility of electrical faults igniting flammable materials, the main focus of these systems is personnel safety. Ensuring that electrical systems are safe for human interaction is a critical aspect of electrical work, particularly in environments with higher voltages where the risks are greater.