What is the 4-Point Soil Resistivity Test? (Part 2)

In this episode, E&S Grounding Solutions President David Stockin continues a discussion on the Wenner four-point method for testing soil resistivity. Sounding should occur at least to the extent of the sphere of influence, which can be determined from the diagonal length of the grounding system. Selecting the proper intervals of test probe spacing is important to avoid a mathematical headache and obtain more accurate models of the soil resistivity. IEEE Standard 80 suggests taking soundin...