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Why some appliances have three pin plugs?

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passer_by

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why is it that some appliances have three pin plugs while some have two pin plugs??
 

Re: plugs

It has to do with the safety laws. The third wire in the wall socket is connected to the earth at the building wall where the mains power comes in.

If the plug has two pins, the device is required to have two independent layers of insulation around the outer surface. If the outer surface is metal, it is connected to the third pin.
 

Re: plugs

ahan,
can ne one tell me wats the difference between earthing and grounding,

i personally think that the third pin is for grounding,
but now this question has intrigued me a bit to ask u for a diff between earthing and grounding
 

Re: plugs

bizoo said:
ahan,
can ne one tell me wats the difference between earthing and grounding,

i personally think that the third pin is for grounding,
but now this question has intrigued me a bit to ask u for a diff between earthing and grounding

It is only a word difference and depends on what country you are in. British=earth US=ground
 

Re: plugs

The third pin is generally connected to the earth just for the sake of safe operation of devices
 

Re: plugs

Brief explanation of this question gets in below Link – really good
**broken link removed**
 

plugs

the pin is termed prong... two prong, three prong plug
 

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