What is the proper approach to verify GFCI function during an inspection?

• A. Only inspect visually; electrical testing is not required.
• B. Test the GFCI at the outlet with the test button and confirm it trips and resets properly; verify downstream protection as required.
• C. Test the GFCI at the panel main breaker.
• D. Use a multimeter on the neutral conductor.

Answer: (B)

GFCI function is verified by performing a functional test, not just a visual check. Use the receptacle’s built-in test button to simulate a ground fault. When pressed, the GFCI should trip quickly, cutting power to that outlet and any downstream outlets protected by the same device. Then reset to restore power. This test confirms both the sensing mechanism (detecting the imbalance between hot and neutral) and the disconnection action.

Why this approach is best: simply inspecting the device visually doesn’t prove it will respond to an actual fault. Testing at the panel main breaker isn’t the standard method for verifying receptacle protection, and using a multimeter on the neutral won’t demonstrate the trip function or protection of downstream outlets. If downstream outlets exist on the same protected circuit, ensure they lose power when the test button is pressed and that they return power after reset.