What type of service is specifically referenced for the voltage and grounding requirements of GFPE in the NEC context?

• A. Solidly grounded wye electric services
• B. Isolated delta services
• C. Floating systems
• D. Ungrounded systems

Answer: (A)

Ground-Fault Protection Equipment is designed to work when there is a defined path for fault current to return to ground, which is provided by a solidly grounded wye service where the neutral is bonded to the grounding system. This bonding creates a reliable fault current path that GFPE can detect and cause the protective device to trip quickly, enhancing safety.

In contrast, isolated delta, floating, or ungrounded systems either do not provide a reliable ground fault current path or limit fault current in ways that would prevent GFPE from operating as intended. Because of that, the NEC references the voltage and grounding requirements for GFPE specifically in the context of solidly grounded wye services.