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Participant

Join Date: Apr 2009
Posts: 1

electrical

04/18/2009 11:58 PM

why is the earth pin in plug or socket bigger than the other two phase and neutral?

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Power-User

Join Date: Jan 2008
Location: since 20 Jan 09, the USSA
Posts: 375
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#1

Re: electrical

04/19/2009 12:27 AM

The ground pin should be both bigger in girth and slightly longer.

You want the safety ground to have higher ampacity than the feeder, so that in the event of a fault and a malfunctioning breaker, the feeder opens (fuses) before the safety ground.

And you want the ground pin longer, so that the ground is the first connection made when connecting, and the last connection broken, when disconnecting.

These are all shock hazard-related issues.

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Guru

Join Date: Oct 2008
Posts: 42290
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#2

Re: electrical

04/19/2009 12:29 AM

It isn't bigger, it's different.

You figure it out.

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#3

Re: electrical

04/20/2009 3:34 AM

So that the earth pin of the appliance cannot be inserted into the live receptacle in the socket inadvertently. The consequences would be quite shocking.

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