Wiring Color Codes | Color Codes | Electronics Textbook wwwboutcircuits››Vol. V - Reference›Color CodesThe colors adopted as local practice are shown in Table below. Black, red, and blue are used for 208 VAC three-phase; brown, orange and yellow are used for 480 VAC. Conductors larger than #6 AWG are only available in black and are color taped at the ends. US AC power circuit wiring color codes. Identifying House Electric Wiring Colors | DoItYourself wwwyourself››Home AutomationIdentifying House Electric Wiring Colors The quickest way to identify house electrical wiring is by its color. Depending on where a wire ultimately gets installed, you cannot always rely on the markings printed on the insulation coating, nor will you always be able to read them legibly.