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Anonymous Poster

Earthing Impedance Formula

03/08/2010 12:02 PM

hello everyone,i would like to ask you a question about earthing empedance calculation following formaulas are for a one ground rod but they are from different sources, R=(ro/2.pi.L).((ln4.L/r)-1) R=(ro/2.pi.L).((ln4.L/r)) now both these formulas calculates the empedance. First one is from BS7430 Second one is from Turkish Standarts. which one is the right one? Which one should we use
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lyn
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#1

Re: earthing empedance formula

03/08/2010 12:13 PM

1. Where are you?

2. It's impedance.
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Doorman
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#2

Re: earthing empedance formula

03/08/2010 1:29 PM

Along the line of lynlynch's question...

If under the control of British standards, use BS-7340; if under control of Turkish standards, use that. Another jurisdiction, then ???

I would guess if uncertain which of the two referenced here is applicable, use the larger rods. Is too much earth a bad thing?

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