Identifying House Electric Wiring Colors | DoItYourself Identifying House Electric Wiring Colors By: A white wire that has been marked with black means it's acting as a hot wire and is no longer neutral. protecting the individual from electrocution. Red. Red wires are commonly found in sheathed, multi-conductor cable. These are typically used for switch wiring. Since red wires still conductAuthor: DIY Staff What Do Electrical Wire Color Codes Mean? | Angie's List Your house is set up for a fan with a light on it.(black wire) The fan you purchased seems to have no light.(no black wire) Wire your fan red-red, white-white, green-ground, and cap the black wire. Try the switch after you wire it up.