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rrahul
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Join Date: Jan 2012
Posts: 2

NGR

01/26/2012 5:42 AM

From DG star point to NGR one end we are using 1CX70 sqmm and from other end to earthpit we are using 1CX6 sqmm,though it is single line ckt why two different sqmm cable used?
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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
#1

Re: NGR

01/26/2012 5:46 AM

Is it because the prospective fault current is different each side of the NGR? What does the original design calculation say, and why has it not been posted for the forum to review?

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electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#2

Re: NGR

01/26/2012 9:20 AM

Grossly incorrect to use two grossly different sizes of conductors in a series circuit. What is the voltage rating, the kVA Rating of the DG Set and the NGR rating?
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rrahul
Participant

Join Date: Jan 2012
Posts: 2
#3
In reply to #2

Re: NGR

02/02/2012 7:26 AM

But it is given in design DG Rating is 300 kVA and NGR 470 Ohm. So please clarify why two different size conductors used in a series circuit (On each side of the NGR. From DG to NGR 1C x 70 sqmm and NGR to Neutral Earth Pit 1C x 6 sqmm). Is it because of voltage drop in ngr? Please clarify.
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muditmah
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Join Date: May 2011
Posts: 84
Good Answers: 1
#4

Re: NGR

02/07/2012 3:45 AM

i also could not figure out why the designer has proposed so..

if u get the answer. plz post it here..

best answer wud be given by the designer himself.
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electricalexpert65 (1); muditmah (1); PWSlack (1); rrahul (1)

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