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jhunair
Associate

Join Date: Feb 2011
Posts: 40

TN-S

12/18/2011 6:41 AM

Dear Gurus,

For TN-S system, I know for TN-S system it is 3phase, 5W scheme, the system grounded neutral (N) and the equipment grounding protective conductor (PE) are separate, the system has redundant sources. It is possible to use only 3P breaker at the incomer and bus coupler since we will not use the neutral as current carrying conductor?
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SolarEagle
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Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#1

Re: TN-S

12/18/2011 8:30 AM

Why don't you just fax us the test and be done with it?

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jhunair
Associate

Join Date: Feb 2011
Posts: 40
#2

Re: TN-S

12/18/2011 12:54 PM

Dear Solar Eagle

What do you mean just fax it and be done with it.
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TonyS
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United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#3
In reply to #2

Re: TN-S

12/18/2011 8:55 PM

Basically you're being told to do your own homework.

Three questions in succession, all pointing towards a test paper you have been set. If you do the test on your own you will learn so much more. When you come to your final exams will you be able to ask an internet forum the answers, no you won't! Learn to think for yourself.

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brich
Guru

Join Date: Oct 2009
Location: sometimes Wales,UK.. was Libya, now Oman!
Posts: 1715
Good Answers: 117
#6
In reply to #2

Re: TN-S

12/19/2011 3:42 AM

if you send your test paper to us we will do it for you and get you your pass mark!

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brich
Guru

Join Date: Oct 2009
Location: sometimes Wales,UK.. was Libya, now Oman!
Posts: 1715
Good Answers: 117
#4

Re: TN-S

12/19/2011 12:33 AM

WARNING: CR4 does not do homework!

Just how many times do we have to tell folk?

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PWSlack
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.
Posts: 32175
Good Answers: 839
#5

Re: TN-S

12/19/2011 3:38 AM

What's the pass mark?

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electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#7

Re: TN-S

12/29/2011 6:46 AM

Yes! you can! provided, you are not connecting any standby source also to the same bus (in which case, at least one of the breakers, either of the incomers or the bus coupler, MUST be four pole). And, it is wromg to say that the neutral would not carry any current. Whether thro a breaker or not neutral conductor would surely carry the unblance currents.
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Users who posted comments:

brich (2); electricalexpert65 (1); jhunair (1); PWSlack (1); SolarEagle (1); TonyS (1)

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