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vishvnath
Member

Join Date: May 2008
Posts: 7

Earth Resistance

11/19/2008 11:39 AM

Dear all,

Please tell me what should be the value of Earth pit for 11kv/415 volts 1250 kva transformer substation, and distribution feeder as per standered rules.
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Anonymous Poster
#1

Re: Earth Resistance

11/19/2008 8:47 PM

please consult your electrical eng'r he has the better answer for you.
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ashuashi
Associate

Join Date: Aug 2007
Location: New Delhi, India
Posts: 33
#2

Re: Earth Resistance

11/19/2008 11:17 PM

Hi Vishvnath

Before posting any querry, do some homework to search in the forum. You will find the information here http://cr4.globalspec.com/thread/28810/Earth-Resistance-Limits

regards,

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 Ashish Gupta
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Anonymous Poster
#3
In reply to #2

Re: Earth Resistance

11/20/2008 1:06 AM

thanks for your reply, it should be better if you write in figure.
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ashuashi
Associate

Join Date: Aug 2007
Location: New Delhi, India
Posts: 33
#4
In reply to #3

Re: Earth Resistance

11/20/2008 3:52 AM

check the thread for which the link is provided. You will get the ER values

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 Ashish Gupta
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wangito
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Hobbies - HAM Radio - CE3AM....4X4SW....CE3NSW

Join Date: Aug 2006
Location: Santiago Chile.
Posts: 845
Good Answers: 7
#5

Re: Earth Resistance

11/20/2008 6:54 PM

It really puzzles me sometimes. Don't you guys have something like a National Electric Code?

Wangito.

__________________
 Never trade luck for skill.
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Anonymous Poster
#6

Re: Earth Resistance

11/27/2008 2:48 AM

Dear Sir,

First you need to work out regarding the short circuit current capacity along the time.

Also, soil resistivity in Ohm/metre needs ro be determined.

Based on design the earth grid. (Cross section of earth Conductor, spacing between the conductor, depth underwhich the conductor shall be buried).

For your system the earth reisitnce shall be atleast equal or less than 1 Ohm.

Best Regards,

N.Suresh
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