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what is three pin?
A three-pin plug is a device to connect any electrical gadget especially the portable one like television, vacuum cleaner, microwave oven, refrigerator to the electric supply from the house wiring. This is inserted into the socket. It has three round pins.The top pin for earth connection is longer and of greater diameter than the other two pins. This helps to inset the plug in a right way into a particular socket. The longer earth pin ensures that the earthing contact is made first before the live wire is connected to an appliance providing safety. In case of any leakage the thick earth pin conducts the charge to the earth easily and provides good earthing and due to its thickness even by mistake it cannot be inserted into the live hole of the socket.


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