In a service with ground-fault protection that is a neutral-ground strap type, the GFPE monitors when ground-fault current passes over what?

The correct answer is that the ground-fault protective equipment (GFPE) monitors when ground-fault current passes over the main bonding jumper.

The main bonding jumper is crucial in grounding systems as it connects the grounded (neutral) conductor to the grounding electrode system. In services with a neutral-ground strap type of ground-fault protection, the GFPE is designed to sense the difference in current between the ungrounded conductors and the grounded conductor. When ground-fault current flows, it will pass through the main bonding jumper, which allows the GFPE to detect the fault condition effectively.

This detection is essential for quickly disconnecting the circuit to reduce the risk of electric shock and minimize damage caused by the ground fault. The main bonding jumper serves as the reference point for monitoring these ground-fault currents, making it integral to the operation of the GFPE. Options that include ground electrodes, equipment grounding conductors, or load side conductors do not perform the same role in sensing and monitoring ground faults within this specific context.