What is a key reason to bond neutral and ground at the service equipment?

• A. To prevent corrosion of metal parts.
• B. To reduce voltage drop over long runs.
• C. To prevent shock hazards and ensure proper operation of protective devices.
• D. To eliminate the need for grounding electrodes.

Answer: (C)

Bonding neutral and ground at the service equipment creates a single reference point where the return path for fault current and the equipment grounding path meet. This ensures that if a live conductor accidentally contacts a metal enclosure, there is a low-impedance path back to the source so the overcurrent protective device can trip quickly, which minimizes shock risk and keeps metal parts at or near earth potential. It also guarantees that the protective devices operate correctly because the fault current has a reliable route to trip them.

The other ideas aren’t the primary purpose: bonding isn’t about preventing corrosion, it doesn’t meaningfully reduce voltage drop on normal runs, and it doesn’t eliminate the need for a grounding electrode system.