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manzoor14
Active Contributor

Join Date: Aug 2008
Posts: 19

Grounding of MV Switchgear Panels

05/30/2014 4:13 PM

Dear All,

Recently we have made a grounding pit with four (4) copper coated rods each of 1.5 meter length connected all in parallel. Then checked the ground resistance of copper rods independently with Kyoritsu Earth resistance tester using 3 wire method (Fall-of-potential), the resistance was 12.54Ω.

Later on we connected the grounding rods with the grounding cable coming from panels and again checked the resistance of the grounding rod from the same point as we checked earlier the result was 1.55Ω. Now I have the following questions.

1. Why is the difference in two readings?

2. Which one is the correct grounding resistance?

3. Is the 2nd method is correct or not?

Please guide me accordingly.
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Pathfinder Tags: GROUNDING OF ELECTRICAL PANELS
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SolarEagle
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Location: by the beach in Florida
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#1

Re: GROUNDING OF MV SWITCHGEAR PANELS

05/30/2014 4:21 PM

I found this guide for you....

http://www.weschler.com/_upload/sitepdfs/techref/gettingdowntoearth.pdf

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manzoor14
Active Contributor

Join Date: Aug 2008
Posts: 19
#2
In reply to #1

Re: GROUNDING OF MV SWITCHGEAR PANELS

05/30/2014 5:55 PM

Thanks a lot SolarEagle (Guru), I got my answers from this reference guide.
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lyn
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Join Date: Oct 2008
Posts: 42355
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#3
In reply to #2

Re: GROUNDING OF MV SWITCHGEAR PANELS

05/30/2014 7:03 PM

I think that it would be appropriate when someone performs research for you and supplies you with correct answers, the least you could do is vote SE a GA.
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Deefburger
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Join Date: Mar 2011
Location: Sebastopol, California
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#5
In reply to #3

Re: GROUNDING OF MV SWITCHGEAR PANELS

06/01/2014 9:58 AM

Then why not give him one yourself Lyn?

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lyn
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#7
In reply to #5

Re: GROUNDING OF MV SWITCHGEAR PANELS

06/03/2014 7:57 PM

OK.
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unclefastguy
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Fans of Old Computers - PDP 11 - New Member

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Location: In a mushroom field somewhere in Canada. Kept in the dark and fed sh--, well you know.
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#6
In reply to #3

Re: GROUNDING OF MV SWITCHGEAR PANELS

06/02/2014 7:41 AM

CR4 ADMIN: Deleted Post

Abuse/Attack: This post was deleted because it was an attack on another user. Please review the CR4 Site FAQ and the CR4 Rules of Conduct.

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navdeep_goyal
Associate

Join Date: Apr 2014
Posts: 51
#4

Re: Grounding of MV Switchgear Panels

06/01/2014 2:16 AM

You checked individual pit resistance 1st that comes 12.54 ohm

now you checked grid resistance of four parallel earthing pits so resistance should be 12.54/4 i.e. approx 3 ohm.

Both methods of measurement resistance are ok
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Deefburger (1); lyn (2); manzoor14 (1); navdeep_goyal (1); SolarEagle (1); unclefastguy (1)

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