The  mains supply is delivered to houses using a three core wiring called the live neutral and the earth . The live wire is brown in colour and brings in the current. the neutral coloured  Blue  is the return  wire . The earth is coloured green or yellow. These wire supply electricity to separate circuits within the house . Two separate circuit are used. One of 15A for Appliance with higher power ratings and the other of 5A ratings for others . The earth wire is usually  connected to a metal plate deep in the earth near the house. It is  safety measure  and does not in any way affect the supply .

Electric Appliances mainly used at home