Calculation of Resistance to Ground：Two Ground Rods：Spacing between rod is longer than length of rod.

Calculation of Resistance to Ground：Two Ground Rods：Spacing between rod is longer than length of rod.

1Ground resistivity：ρΩ･mSee below table.
2Length of vertical ground rod：Lm-
3Radius of vertical ground rod：amm-
4Spacing between two rods：sm. s＞L-
5GraphPlot Input Data： , Figure：
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Keyword･Reference･Remarks･History

LaTex

Keyword

Resistance to Ground,Two Ground Rods,Spacing between rod is longer than length of rod,Ground resistivity,Length of vertical ground rod,Radius of vertical ground rod.

Reference

[1]：H.B.DWIGHT：『Calculation of Resistances to Ground』,American Institute of Electrical Engineers,1936,Volume: 55 Issue:12,pp.1319 - 1328.
[2]：Copper Development Association：『Earthing Systems - Fundamentals of Calculation and Design』,pp.2

Remarks

・ρ：Ground resistivity(Ω･m).Cited from Reference[2].
Type of Ground Range of values Average value
Boggy ground 2 - 50 30
Adobe clay 2 - 200 40
Silt and sand-clay ground, humus 20 - 260 100
Sand and sandy ground 50 - 3,000 200 (moist)
Peat ＞1,200 200
Gravel (moist) 50 - 3,000 1,000 (moist)
Stony and rocky ground 100 - 8,000 2,000
Concrete: 1 part cement + 3 parts sand 50 - 300 150
1 part cement + 5 parts gravel 100 - 8,000 400
・R：Resistance to Ground
・L：Length of vertical ground rod
・a：Radius of vertical ground rod
・s：Spacing between two rods
・Making above Equation Image is powered by CODECOGS

History

・2010/08/13：Upload

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