Which conductor is used to connect the equipment grounding conductor at the service facility?

The main bonding jumper is the conductor used to connect the equipment grounding conductor at the service facility. This connection is critical because it establishes a low-resistance path for fault currents to ensure safety in the electrical system. By bonding the grounding system to the neutral at the service point, it helps to stabilize the voltage during normal operation and provides a safe pathway for fault currents, facilitating the operation of circuit protective devices in case of a fault.

The main bonding jumper essentially ties together the grounding and neutral systems to create a single reference point for voltage, helping to ensure that the electrical supply remains safe and effective. This bonding reduces the risk of shock hazards and provides a path for electrical surges or faults to be safely carried away from equipment and personnel. The correct implementation of the main bonding jumper is a key aspect of proper grounding practices that adhere to electrical codes and standards.