Question

The supply line has three wires: live, neutral and earth.

Answer 1

In our homes, we receive supply of an electric power through the main supply (also called mains), either supported by overhead electric poles or by underground cables. One of the wires in the supply, usually with red insulation, is called a live wire. Another wire, with black insulation, is called neutral wire. In our country, the potential difference between the two is 220 V. Another wire in green insulation is called earth wire.