What Do Electrical Wire Color Codes Mean? | Angie's List wwweslist›Solution Center›ElectricalWhat Do Electrical Wire Color Codes Mean? Don't be confused by the jumble of electrical wire colors. the porch and garage lights. The wires coming out of the house are red, white and yellow. The wires on the fixture are white, black and bare copper. I know the copper is the ground. "I know everything I need to know about electrical How to Wire a Switch With White, Black and Ground Wires Dec 20, 2018You connect the black wires in the electrical box to the switch terminals, and the white wires to each other. The switch also has a green terminal for the ground wires, which usually are bare.