GFCI Circuits:

Ground Fault Circuit Interrupter (GFCI) is a device designed to protect ground faults of 4-6 mA or more, over loads, and short-circuits. When a Class A GFCI device senses a ground fault within a predetermined time and rating of 4-6 mA the power will disconnect. This is not a fail safe from electrical shocks. Caution should always be used when using any electrical device.

Ground Fault Interrupter (GFI) is a device designed to protect equipment from damage when line-to-ground faults occur. It is not intended to protect personnel. The device will sense 30 mA to ground or above and disconnect power to its corresponding device that it is protecting.

GFCI & GFI both protect against ground to neutral loads. A GFCI (personnel protection) has a small transformer that inserts a voltage to the neutral. When a load is present on the neutral and a ground to neutral load occurs a ground fault current is generated and the GFCI trips. A GFI (non-personnel) requires a load current to create a ground current to exist.

GFCI protection is found in dwelling unit receptacles that are within bathrooms and powder rooms, kitchen counters, garages, wet bars, unfinished basements and exterior outlets. Not all exterior outlets have GFCI protection. Consult a qualified electrician for more information.