Why is the earthing pin in the socket of electrical appliances so long and thick?
S.P.S. JAIN New Delhi Power plugs and sockets are devices for removably connecting an electrically-operated device like, water heater, electric grinder, washing machine, electric iron, etc. to the commercial power supply so that electric power can flow to them. An electric plug is a male electrical connector with contact prongs to connect mechanically and electrically to slots in the matching female socket. Plugs usually have a live or hot contact (known as phase) and a neutral contact (known as neutral) which carry current during normal use. P and N are the symbols respectively used to designate the phase and neutral. When we use heavy equipment or accessories with metal bodies, we require protection against fault or mal-operation of the equipment so that we do not get electric shock or electrocuted. Hence, the third pin (known as earth) is connected to the earth. This earth pin will be effective only when the electric supply system has proper earthing. During normal operating conditi
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