277v Wiring Colors. What are the wire colors of 277V single phase. This is required in NEC article 11015 However these high-leg delta systems are uncommon with newer installations.
To be designated specific colors the widely accepted coding for 277480 is brown orange yellow or purple. These high-voltage connections are quite common in many manufacturing and other industrial areas. Assortment of 277 volt ballast wiring diagram.
Any other colors expected the above mentioned can be used for Live Line or Hot wires.
Assortment of 277 volt ballast wiring diagram. But it doesnt mean connection between the wires. For example a four-wire multiwire branch circuit may be marked with all of the associated colors while a two-wire branch circuit may be marked as blue and white for 120V or yellow and gray for 277V. The code book states the colors for a 120208 and 277480 electrical systems are white and grey respectively.
