Identifying House Electric Wiring Colors | DoItYourself Black. The wire that carries the current from the power source to the outlet or receptacle is the hot wire. Whenever you see a black wire, you know it is hot. There are other wires that carry current in more complicated circuits, but black are always hot. Think about most wires and cables that you don't see as part of your home's wiring.Author: DIY Staff What Do Electrical Wire Color Codes Mean? | Angie's List Any circuit's black wire should be considered hot or live. Black wire is never used for a ground or neutral wire and should be used as the power feed for a switch or an outlet. A black wire is often used in a circuit as a switch leg, the connection that runs from the switch to the electrical load. Wiring Examples and Instructions Wiring examples and instructions with video and tutorials. My site is dedicated to helping you get connected. Whether it's trying to figure out that rat's nest behind your television set or just simply changing over an electrical wall switch or outlet, I'm here to help.