US AC power circuit wiring color codes.
Function label Color, common Color, alternative
Protective ground PG bare, green, or green-yellow green
Neutral N white grey
Line, single phase L black or red (2nd hot)
Line, 3-phase L1 black brown
Line, 3-phase L2 red orange
Line, 3-phase L3 blue yellow
(https://s3.postimg.cc/3nwkzkz3z/Electrical_AC.jpg) (https://postimg.cc/image/3nwkzkz3z/) (https://s23.postimg.cc/boqy0cuc7/Electrical_AC1.jpg) (https://postimg.cc/image/boqy0cuc7/)