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3-pin plugs are used in different forms throughout the world and most of them have one live pin, one neutral pin and one earth pin. The current flows through the live and neutral pins via the load (e.g. tv, kettle etc.), while the earth pin is there for safety connected to an electrical 'earth' but not directly to the supply.
Then if the tv, kettle etc. develops a fault inside, with the live wire accidentally touching the case, enough current will flow to blow the fuse and prevent any injury if anyone should happen to touch the case.
All appliances must have a 3-pin plug except certain low-power items with double insulation inside.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoA three pin socket is superior to a two pin socket because it protects the user from receiving electric shocks.The bigger pin is the earth connector which does the job of protecting the user.
Wiki User
∙ 7y agoThe design of a three pin plug is two current caring pins and one ground pin.
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