electrical engineering

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RAMANVADIVELU Participant Join Date: Mar 2009 Posts: 2	electrical engineering 04/04/2009 11:40 AM
	WHERE SHOULD I USE FOUR POLE BREAKERS.IF I USE THREE POLE BREAKERS IN THAT CONDITION WHAT WILL HAPPEN?
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jangkly Associate Join Date: Apr 2008 Location: 66°N (almost) Posts: 46 Good Answers: 1	#1 Re: electrical engineering 04/04/2009 6:35 PM
	Hi Depending on your country´s regulations and situations. Normally you use 4pole CB´s for 3phases and neutral. Usually it is not nessesary to disconnect the nutral (blue wire), but in some systems it is required for security reasons. Keep in mind that if you make it possible to disconnect neutral via fx. breaker or switch then you have to disconnect all phases simultaniously with it, in that case you need 4pole CB It should not be possible to disconnect neutral without disconnecting the phases. Regards GJA __________________ It is no use saying, 'We are doing our best.' You have got to succeed in doing what is necessary. Winston Churchill
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