Following a standard color coding will help in classifying the function of each wire and also helps in maintaining the safety standards.
In the United States, household color coding is as follows,
3-phase line (L1)/ single phase Line - Black
3-phase line (L2) - Red
3-phase line (L3) - Blue
Neutral (N) - white
Earth/Ground (G) - Green/Green-Yellow, Bare wire.
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