Wiring Color Codes | Color Codes | Electronics Textbook Wiring for AC and DC power distribution branch circuits are color coded for identification of individual wires. In some jurisdictions all wire colors are specified in legal documents. In other jurisdictions, only a few conductor colors are so codified. In that case, local custom dictates the What Is the International Color Code for DC Wiring For the most part, DC wiring follows the color codes established for AC wiring. The United States uses its own color codes for AC and DC wiring. For DC wiring, the protective ground wire is green or greenish-yellow, negative wires are black, positive wires are red, and white wires are used as the mid-wires in a three-wire grounded circuit.