High Voltage Wire Colors

277 480 volt ac.

High voltage wire colors.

It is now possible to have high voltage wiring color coded orange bright blue or even yellow. Some local jurisdictions in our area have required type ac mc cable to be marked externally with a color code to identify as high voltage 480 277 volt v or low voltage 240 120v. But a general color code is used to identify different types of conductors which are used in electrical wiring. Graphic products s guide to electrical wiring colors walks you through what each of the various colors means and what the different wire color coding standards are.

Some hybrid vehicles use two different colors for their high voltage electrical system on the same. I have seen industry wide identification of fire alarm ac cable externally identified red but not branch circuits. This means that they have a full rated insulation system which will consist of insulation semi con layers and a metallic shield. Due to the serious potential for deadly electrocution or other issues getting these color codes right is essential.

If the wiring system has one phase at a higher voltage than the others using a high leg connection that phase s wires should be marked with orange. 277 480 volt wire color standards. Phase 1 phase 1 wiring should be brown.