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Anonymous Poster

Earthing

04/22/2009 9:48 AM

I have a Panel having 40A,25kA incomer, please give me the earth cable size calculation
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Simon Wan
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Join Date: Apr 2007
Posts: 577
Good Answers: 10
#1

Re: Earthing

04/22/2009 8:08 PM

From the cable data's you will require 4Cx16sq-mm size cable for your power and earthing or you can use 3Cx16sq-mm for your power and for earthing cable you can selects 10sq-mm or 16sq-mm

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kveeresh2
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Join Date: Apr 2009
Location: Bangalore, INDIA
Posts: 34
#2

Re: Earthing

04/25/2009 3:34 AM

Use 4core(for RYBN) ,6 Sq.mm, Copper multi strand Flexible Cable.

& Earthing 10 sq mm copper.

In some cases, 5core cable of the same size is allowable.

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Anonymous Poster
#3

Re: Earthing

04/28/2009 5:42 AM

just asking...ur panel incoming is 40A but why your bus bar rating is 25KA...seem too high...or am i wrong...if you follow incoming cable, you can size ur earting either 16mm2 or a little bit lower..but if you size according to the fault level 25kA your earthing probably around 70mm2...refer to ieee std 80-2000 for additional info.
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