Soil – most think “hey, it’s just dirt”, but when it comes to electricity, soil becomes more complex. Electrical resistivity (resistance to current flow) is one characteristic of soil that requires specific knowledge regarding testing and application in grounding system design. Soil is made up of combinations of clay, sand, loam, and various types of rocks. These components have differing amounts of electrical resistivity, and the soil composition varies significantly throughout the United States. Soil…
