GFCI protection is designed to protect against what?

• A. Overcurrent protection to prevent a fuse from blowing.
• B. Electrical shock due to ground faults.
• C. Voltage regulation under load.
• D. Surge protection.

Answer: (B)

GFCI protection is designed to prevent electrical shock from ground faults. It does this by continuously monitoring the current in the hot and neutral conductors and looking for even a small difference. If current leaks to ground—such as when a person accidentally contacts a live conductor and a path to ground is present—the currents in hot and neutral become imbalanced. The GFCI detects that imbalance and quickly interrupts the circuit, typically at leakage levels around 4 to 6 milliamps, which greatly reduces the risk of a dangerous shock.

This safety function is separate from overcurrent protection, which guards wires from overheating by disconnecting if current is too high; voltage regulation, which keeps output stable under changing load; and surge protection, which guards against brief spikes. GFCIs are especially important in wet or damp locations where the chance of shock is higher.