Karthik R
Administrator

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.