electronicshubImage: electronicshubWhat Do Electrical Wire Color Codes Mean?Black. Black electrical wire is used for power in all circuits.Red. Red electrical wire indicates the secondary live wires in a 220-volt circuit,..Blue and yellow. Yellow and blue electrical wires are also used to carry power..White and gray. White and gray indicate a neutral wire. What Do Electrical Wire Color Codes Mean? | Angie's List Was this helpful?