Where are GFCIs requried?
GFCI (Ground Fault Circuit Interrupter) receptacles are required by the National Electrical Code (NEC) in kitchens, bathrooms, garages and outdoors. They are also required and in many receptacle locations both inside and outside the home where water is present. A GFCI will detect even a relatively tiny amount of ground fault current and shut off power to its face and any downstream receptacles that are connected to it.
