What is a grounding electrode system and name common components?

• A. A system that connects the building to the earth; components include ground rods, metal water piping, and building steel.
• B. A system that isolates the building from the earth.
• C. A measurement device used to assess soil resistivity.
• D. A device that connects the neutral to the grounding electrode only at service entrance.

Answer: (A)

A grounding electrode system is the network that bonds the electrical system to the earth to establish a stable reference and provide a low-impedance path for fault currents so protective devices can operate. Common components are grounding electrodes such as ground rods driven into the soil, metal water piping that’s bonded to the system, and building steel that is connected as part of the grounding path. There can also be other electrode forms like concrete-encased electrodes; all are tied together with a grounding electrode conductor to the service equipment. This setup ensures fault current can flow to earth and helps keep voltages from rising to dangerous levels. The alternative ideas aren’t correct because isolating the building from the earth does not provide a fault path, a measurement device is not the grounding system, and bonding neutral to the grounding path at the service entrance describes a specific bonding action rather than the entire grounding electrode system.