Which device provides ground-fault protection?

Which device provides ground-fault protection?

• A. GFCI/breakers
• B. Fuses
• C. Ground clamps
• D. Inductive Reactance

Answer: (A)

Ground-fault protection comes from devices that monitor the balance of current between the live and return paths. A GFCI, or ground-fault circuit interrupter, does this by continuously comparing the current in the hot conductor to the current returning on the neutral. If any leakage to ground occurs—such as through a person or damaged insulation—the currents no longer match. When the difference reaches a very small threshold (a few milliamps), the device trips and cuts power almost instantly, preventing electric shock. That immediate detection and interruption is why a GFCI/breaker is the protection you rely on for ground faults. Fuses protect by interrupting current when it exceeds their rating, but they don’t detect or respond to leakage to ground. Ground clamps are used to establish or measure grounding, not to provide active protection. Inductive reactance is a property of coils that resists changes in current and does not serve as a protective device.

Ground-fault protection comes from devices that monitor the balance of current between the live and return paths. A GFCI, or ground-fault circuit interrupter, does this by continuously comparing the current in the hot conductor to the current returning on the neutral. If any leakage to ground occurs—such as through a person or damaged insulation—the currents no longer match. When the difference reaches a very small threshold (a few milliamps), the device trips and cuts power almost instantly, preventing electric shock. That immediate detection and interruption is why a GFCI/breaker is the protection you rely on for ground faults.

Fuses protect by interrupting current when it exceeds their rating, but they don’t detect or respond to leakage to ground. Ground clamps are used to establish or measure grounding, not to provide active protection. Inductive reactance is a property of coils that resists changes in current and does not serve as a protective device.