It used in protection from ground faults in electrical equipment. When it comes to the construction and design it is relatively different from the previous cable. It has a compact unit with double outlets which enable both indoor and outdoor use. It also has a Hi-impact plastic case with a spring hinged cover which makes the appliance robust and less prone to damage. These appliances also have both reset and manual test buttons. The test button which is next to the reset button is used to show if the device is working properly. SJTW wire type is used for this appliance.