Calculation of Resistance to Ground：Two Ground Rods：Spacing between rod is shorter than length of rod.
Resistance to Ground,Two Ground Rods,Spacing between rod is shorter than length of rod,Ground resistivity,Length of vertical ground rod,Radius of vertical ground rod.
：H.B.DWIGHT：『Calculation of Resistances to Ground』,American Institute of Electrical Engineers,1936,Volume: 55 Issue:12,pp.1319 - 1328.
・ρ：Ground resistivity(Ω･m).Cited from Reference.
・L：Length of vertical ground rod
・a：Radius of vertical ground rod
・s：Spacing between two rods
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