Each GFCI outlet has a test and reset button, often labeled black for the test button and red for reset. These buttons can test the power running through the GFCI circuit and reset the outlets.

How They Work If water contacts a device plugged into a GFCI while the device is turned on, the GFCI senses a short circuit and interrupts the connection.

GFCI units are electrical outlets equipped with a ground fault sensor and a circuit breaker which senses a ground fault and is programmed to turn off the electric power to the electrical ...

What a GFCI does is sense an infinitesimally small leak of current toward ground when the current shouldn’t be going that way and trips, or opens, the circuit stopping the current flow.