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admin Staff answered 2 years ago Third is connected to the earth pin. This is used when the appliance has a metal casing to take any current away, in case if the live wire comes in contact with the casing. A 3-pin plug consists of three pins (hence the name).
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admin Staff answered 2 years ago It is for the safty purpose. Earth pin on a three pin plug made longer is first to connect and last to leave. It is bigger to provide low contact resistance.
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