Wiring - Typical wiring color codes

Power Wiring

120/240 Volt 277/480 Volt
Black Phase 1 Brown Phase 1
Red Phase 2 Orange Phase 2
Blue Phase 3 Yellow Phase 3
White Neutral Gray Neutral
Green Ground

Green w/
Yellow stripe


Note: Orange or yellow wires may be energized with the main disconnect off.


DC Wiring

DC + Blue
DC - Blue with white stripe


Next Steps

Go to the Control and Power Wiring Lesson series to select your next lesson.  There are also many other Lesson Series on PLC Programming and Industrial Automation.