Color-Coding Electrical Wires and Terminal Screws Basic Wire Color-Coding. A black or red-hot wire usually connects to a brass-colored screw terminal or black wire lead on electrical devices. A white neutral wire usually connects to a silver-colored terminal or white wire lead. A green or bare ground wire almost always makes a ground connection—to a ground screw on a device, electrical box,.. GFCI Outlet Wiring Diagram | House Electrical Wiring Diagram Ground Fault Circuit Interrupter GFCI is a device which secure person from electric shocks from faulty currents in the electrical devices we use in our daily lives. It works by comparing the input current on the ungrounded side (red-wire) to the output current on the neutral side (black-wire). GFCI Outlet Wiring Diagram : Line or Load With GFCI Connection - The Spruce Ground Connection. This is where the bare or green-colored ground wire connects. If the GFCI's electrical box is metal (not plastic), you must join two pigtails (short lengths of wire) to the circuit ground wires and connect one pigtail to the outlet ground screw and one to the metal electrical box. Electrical Outlets at Lowes Shop electrical outlets in the electrical outlets & adapters section of Lowes. Find quality electrical outlets online or in store.