High Voltage Wire Colors

277 480 volt wire color standards.

High voltage wire colors.

Each wire used for electrical wiring is marked with information like wire gauge ampacity maximum voltage and maximum temperature. 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. A high voltage cable hv cable is a cable used for electric power transmission at high voltage a cable includes a conductor and insulation cables are considered to be fully insulated. Due to the serious potential for deadly electrocution or other issues getting these color codes right is essential.

I have seen industry wide identification of fire alarm ac cable externally identified red but not branch circuits. 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. Some hybrid vehicles use two different colors for their high voltage electrical system on the same. It is now possible to have high voltage wiring color coded orange bright blue or even yellow.

Phase 1 phase 1 wiring should be brown. But a general color code is used to identify different types of conductors which are used in electrical wiring. These high voltage connections are quite common in many manufacturing and other industrial areas.