Ground fault circuit interrupter measure the power, leaving an outlet versus the power coming back to an outlet if there’s a difference in smallest 5 mA the device strips and stops power from circulating. This protection is needed and required to keep you safe while using electrical appliances within 6 feet of a water source, or serving a countertop or a damp locations. These locations that we notice are the disposal, washer, garage outlets, front and back porch outlets, and the kitchen countertop feeding the microwave