What type of grounding electrode is required to accompany a metal underground water pipe for compliance with NEC®?

The requirement for grounding electrodes when using a metal underground water pipe is informed by the National Electrical Code (NEC). According to NEC guidelines, a metal underground water pipe must be supplemented with a grounding electrode to ensure effective grounding of the electrical system.

In this context, the inclusion of both a ground rod and a metallic conduit contributes to a more robust grounding system. The 8-foot by ½ inch copper-clad ground rod provides a direct, reliable path to ground due to its material and length, which is designed to meet NEC standards for grounding electrodes. Additionally, the trade size rigid metal conduit can serve as another grounding means alongside the water pipe, enhancing the grounding integrity by providing multiple paths to ground.

Therefore, having both the ground rod and the metal conduit satisfies compliance requirements, ensuring safety and reducing the risk of electrical faults. This dual approach to grounding embodies the NEC's aim to minimize shock hazards and ensure system reliability. Hence, both grounding methods together fulfill the code’s intention and are essential for effective grounding of the electrical system.