Wiring Color Codes | Color Codes | Electronics Textbook The protective ground is green or green with yellow stripe. The neutral is white, the hot (live or active) single phase wires are black , and red in the case of a second active. Three-phase lines are red, black, and blue. Canada AC power circuit wiring color codes. Electrical Wiring Color Codes - Electronics Hub Sep 05, 2015In case of single phase power supply, Black wire is used as the line wire and in case of 220V supply, Red wire is used as the secondary line conductor. IEC Color Code for most of the European Union (Including UK from 2004) Most of the European Countries follow the International Electro-technical Commission’s electrical wiring color code.