What is the necessity of earthing an electric appliance ?

Explanation

In order to work an electric apparatus, we require two wires, one live wire and the other neutral. Due to wear and tear or due to excessive heating, sometimes live wire touches the body of the apparatus. Due to this we may get shock when we incidently touch the apparatus. To avoid the risk of electric shock, the metal body of the electric appliance is earthed i.e., a wire is connected to the cover of vessel on pne side and to the earth point three pin lug. The one end of the earth point is buried deep in the earth. Earth wire is usually given green or green yellow colour, the live wire is usually red or brown while black or light blue wire acts as a neutral wire.