Wiring Diagrams for GFCI Outlets - Do-it-yourself-help Wiring GFCI Receptacles with a Protected Outlet. This gfci wiring provides protection to a duplex receptacle outlet at the end of the series. By connecting the load terminals on the last gfci, the wall outlet at the end is protected and can be used just as if it were one of the gfci receptacles. Cooper Wiring Device GFCI Receptacles Cooper Wiring Device GFCI Receptacles Hospital Grade Modular GFCI Back & Side Wire. Safety UL Listed, fully compliant with all latest UL 943 (4th edition) Class A GFCI, UL 498 Hospital Grade requirements. ShockSentry lock-out function protects from miswired line-load connections and GFCI circuitry damage.