The color codes vary wildly. For DC circuits, red and black mean positive and negative, most usually the power wires. For AC circuits, the mains wiring have certain preferred colors - Blue and brown and green with yellow stripe are Neutral and hot and ground colors mandated by current EU regulations. What do the electrical wire color codes mean? - Quora Is this answer helpful?Thanks!Give more feedbackThanks!How can it be improved?How can the answer be improved?Tell us how Wiring Color Codes | Color Codes | Electronics Textbook wwwboutcircuits››Vol. V - Reference›Color CodesChapter 2 - Color Codes. See Table below. 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. AC Power Cord Color Codes - Regis Coyne's Web Page BLUE = NEUTRAL. GREEN/YELLOW STRIPE = GROUND. When an appliance or tool requires a three-prong grounded plug, connect the grounding wire (green) under the green terminal screw on the grounding prong; attach the black wire (hot) under the brass terminal screw and the white wire (neutral) under the silver terminal screw.