Red Blue Brown Green Yellow Electrical Wires. The green and yellow cable is known as the earth wire and it serves an important safety role. Blue and yellow electrical wires while wires in these colors carry power they are not used in typical outlet wiring. Before this change old wiring colours in the uk for 2 core wire were red live black neutral and earths are either bare or yellow and green whereas with 3 core cable live red blue neutral.
This has not changed and still denotes the earth wire. Instead blue and yellow wires are used as the live wires pulled through a conduit. Green with yellow stripe is the ground and will go to the building green. You can link two red wires together or you can link a red wire to a black wire.
Green yellow earth standard wire colours for fixed insulated cables an assembly of two or more electricalconductors usually held together with an overall sheath e g.
The brown electrical wire now denotes the live wire and changed from red to brown. Negative of a negative earthed circuit. 3 wire earthed dc power system. 2 wire earthed dc power system. The list below outlines what the different colour codes mean for both single and multi phased.