Soil Resistivity Testing

Soil resistivity testing data is the basis of any predictable grounding system design. It represents the resistance of the earth to the flow of electrical current. Soil resistivity testing is determined by the type of soil and its moisture and electrolyte content and temperature.

Two methods of soil resistivity testing can be done at a particular location. The most common and accurate is the 4-Point Wenner method. The 4-Point method places 4 probes, equal distance from another, in the earth. A current flow is established through the outer probes and the resulting voltage drop is measured across the inner probes. If the probes are spaced 10 feet a part than the soil resistivity test should read 10 feet into the soil. This principle stays true if the probes are 55 feet a part. 

Several locations should be tested. Remember that the data is being used to design the ground system and predict the performance after installation. The more data available, the more confidence you can have in the prediction. This data is then processed with software to accurately determine the soil resistivity. 

Lyncole's Soil Resistivity Testing Method

At Lyncole, our tests are performed where several samples of soil are collected at different depths and different locations, so an adequate design can be accomplished. Our engineers than use this soil resistivity testing to create a three dimensional representation of the grounding system which the computer combines with the layered soil model to predetermine the achieved resistance to earth. The result is a design based upon science, not estimation.

Testing procedures are provided by request. Contact us for more information! 


Lyncole Soil Resistivity Contact Information, 310-214-4000

PHONE: 310-214-4000 

Sign Up For Our Newsletter

Be first to find out about new products, and services.