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The earth pin is longer in a three pin plug so that when being plugged it it makes contact to ground the equipmemt before the other pins make the equipment live. If the equipment has a fault, the earth circuit is already in place to deal with it.
Wiki User
∙ 15y ago
Wiki User
∙ 9y agoOn a three pin mains power plug (UK), the Earth pin is longer so that it pushes against a lever in the wall socket to move away the safety flaps that normally cover the Line and Neutral holes. This flap stops young children poking anything metal into the Live hole when the plug is not in place.
Wiki User
∙ 10y agoThe earth pin is larger for safety, and it has to be longer to go into th socket first to open the two safety shutters.
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