Wiring Color Codes | Color Codes | Electronics Textbook The 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. 3 Pin XLR Wiring Diagram – TOFFER Dec 10, 2015 Balanced audio cable designed for installs usually has a black, white, and ground wire. The uninsulated ground wire should go to pin 1, the red wire to pin 2, and the black wire to pin 3. I hope this helps. Contact me if you have questions or comments.