Why Some Earth pin is made of Plastic ? Electrical interview Question @ElectricalTechnician

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Why Earth pin is made of Plastic ?

A 3-pin plug consists of three pins (hence the name). It is important to know how to wire a 3-pin plug correctly. The 3-pin plugs are designed so that electricity can be supplied to electrical appliances safely. Each wire has its own specified color, as shown above and each pin must be correctly connected to the three wires in the electrical cable.

Now, coming to the second question –

Question-2: Have you also have ever wondered why some appliances use a 2-pin plug and others have 3-pin plug? Appliances such as TVs and DVD players, mobile phones use a 2-pin plug, while other appliances such as refrigerators, microwave ovens, ACs use a 3-pin plug

Insertion of a longer earth pin first helps in opening the shutters, which thereafter facilitates the insertion of the other two pins. In many wall sockets, there are safety shutters on the live and neutral lines to prevent people especially the children from inserting any conducting materials which may result in an electric shock. These types of sockets are known as Earth-pin operated shutters.


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