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Why do sockets have three holes and some plugs two pins?

Question #58623. Asked by someothername.

Answer has 4 votes
Currently Best Answer
22 year member
419 replies

Answer has 4 votes.

Currently voted the best answer.
On plugs with three pins, the third pin is a ground. Smaller appliances and things that don't require as much electricity don't have the ground plug. Larger appliances and things requiring a lot of electricity have the ground. Older sockets often only have two holes... and a ground socket can be added to these by screwing it into the screw holding the plate over the socket.

Aug 01 2005, 9:25 PM
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