The resulting soil resistivity is expressed in ohm-meters or ohm-centimeters. Great soil types are the basis of all grounding models and they're designed from correct soil resistivity testing. As you may see, 4 earth ground stakes are positioned from the soil within a straight line, equidistant from one another. https://soil-resistivity-survey-b10987.blogthisbiz.com/35575354/soil-resistivity-analysis-bd-can-be-fun-for-anyone