Calculation of Soil Resistivity When Resistance of One Rod is Known

Author: R.J.Edwards G4FGQ © 15th February 1998

To obtain a measurement representative of the soil in the vicinity of the rod and down to a useful depth, the rod should be driven to a depth of at least 0.5 metres, preferably 1 metre. It should be spaced away from any other buried conductors by at least five times its own depth in the soil.

Its resistance to earth may have been obtained from the Three-Rods-Test, as described elsewhere in this program, or it may have been obtained directly by measuring it against another earth electrode of known resistance or which has been assumed to have zero resistance to the body of the earth.

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