What is the function of an equipment grounding conductor (EGC)?

• A. To carry normal load current.
• B. To provide a low-impedance path to ground for fault currents to enable rapid de-energization.
• C. To connect neutrals to live.
• D. To increase system impedance.

Answer: (B)

Providing a low-impedance path to ground for fault currents so that protective devices trip quickly is the function of the equipment grounding conductor. This conductor bonds equipment enclosures and exposed metal parts to the grounding system, keeping them at ground potential and giving any fault current a short, low-resistance route back to the source. With a path of low impedance, a fault current can reach the overcurrent device fast enough to trip and disconnect power, reducing shock hazard and equipment damage. Under normal operation, the equipment grounding conductor carries little to no current. It is not intended to carry normal load current, nor does it connect neutrals to live; neutrals are bonded to ground only at the service disconnect in specific arrangements, and the grounding conductor remains a separate safety path. It does not increase system impedance; instead, it provides a controlled, low-impedance path for faults.