Question

How many colour codes of wiring are used in domestic wiring ?

Answer 1

Answer:

NEC Color Code for US

In three phase power supply, the combination of Black, Red and Blue wires for power conductors are used for 120/240V AC whereas the combination of Brown, Orange and Yellow wires for power conductors are used for 277/480 V AC.

Answer 2

according to old convention the colour of live wire is red and according to the new convention the colour of live wire is brown according to the old convention the colour of neutral wire is black and according to the new convention colour of neutral wire is light blue according to the old convention the colour of earth wire is green according to the new convention the colour of earth wire is green or yellow