What is the purpose of a grounding electrode system?

• A. To provide a low-impedance path to earth for fault currents and to stabilize system voltage
• B. To increase voltage
• C. To protect against surges
• D. To connect neutrals to ground

Answer: (A)

Grounding electrode systems establish a solid reference to earth so fault currents have a low-impedance path back to the source. This lets any current caused by a fault flow quickly, which makes protective devices like fuses or breakers trip promptly and reduces the risk of shock and fire. At the same time, the earth reference helps keep voltages close to earth potential during normal operation and during transient events, minimizing dangerous voltage differences on exposed conductors and metal surfaces.

The other ideas don’t fit as the main purpose. A grounding system doesn’t purposefully increase voltage. It isn’t intended as the primary means of surge protection (that role is filled by surge devices, with grounding providing a path for fault or surge energy). And while neutrals are bonded to ground at a single point in the service equipment, the overall grounding electrode system is about creating that earth reference and fault-path, not constantly tying neutral to ground throughout the system.