Ground-fault protection of equipment is required from solidly grounded electrical services exceeding what voltage?

Ground-fault protection of equipment is a safety measure designed to protect against the risk of electrical shocks and fires caused by ground faults. In the context of solidly grounded electrical services, ground-fault protection becomes necessary for systems beyond 150 volts to ground, which corresponds to certain higher voltage systems.

When the voltage exceeds 150V, there is an increased risk of serious electrical hazards, making it important to include ground-fault protection to enhance safety. This requirement is outlined in various electrical codes, as it signifies the point at which the potential for danger increases enough to necessitate additional safety precautions.

The specific requirement for ground-fault protection starting at this voltage helps ensure that appropriate measures are in place for systems handling higher voltages, thus protecting both equipment and personnel from electrical faults.