What is the 4-Point Soil Resistivity Test? (Part 2)
Ask the Grounding Experts · Hosted by David R. Stockin, P.E.
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About This Episode
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 soundings at a depth of up to three times the extent of the sphere of influence. It is very important to know how to safely handle the high-power equipment used to get the deeper soundings.
About the Host
David R. Stockin, P.E. is President and co-founder of E&S Grounding Solutions, Inc., a Service-Disabled Veteran-Owned Small Business (SDVOSB) specializing in electrical grounding and lightning protection engineering. David has performed grounding and lightning protection studies in over 160 countries across 6 continents and is an IEEE-accredited continuing education provider.
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