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mohsinhamid
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Join Date: May 2011
Posts: 91

Usage of 3P+N VS 4 Pole

03/02/2013 9:18 AM

where in electrical installations 3P+N is used...? and 4 Pole is used....????
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brich
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Join Date: Oct 2009
Location: sometimes Wales,UK.. was Libya, now Oman!
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#1

Re: Usage of 3P+N VS 4 Pole

03/02/2013 10:51 AM

you need to look at your question and re-write it.. it makes no sense!

Sorry my friend, but that's the reason you've had no answers

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PWSlack
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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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#2

Re: Usage of 3P+N VS 4 Pole

03/04/2013 3:22 AM

Elsewhere than in the UK is the simple answer. Switching a neutral is contrary to all the good sense contained in British Standard 7671.

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msamad
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Join Date: Feb 2009
Location: Houston, USA
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#3

Re: Usage of 3P+N VS 4 Pole

03/06/2013 6:42 PM

This comment may help you:

http://cr4.globalspec.com/comment/560522

- MS

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cuba_pete
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Join Date: Dec 2010
Posts: 1895
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#4

Re: Usage of 3P+N VS 4 Pole

03/07/2013 3:17 PM

Yikes...

3P+N is used at the input of a distribution transformer...

If you saw a 4-pole breaker you may be confusing that with a 4 phase system, which would be quite esoteric to begin with.

4-pole breakers were at one time used for building up the service by using lower ampacity breakers in parallel for, say, a split-phase service to a residence (US). For example, a 100 Amp service could use four 50 Amp breakers with each phase utilizing two 50's in parallel.
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