2-point

In this episode, E&S Grounding Solutions President David Stockin builds upon the previous episode’s discussion on testing the continuity of a grounding system, this time focusing on the clamp-on method. In this method, the clamp-on meter will induce a current on the system in two directions. The clamp-on meter can then determine the resistance. Normally, a low resistance reading will indicate that there is a good continuous loop between the grounded object under test and the larger grounding system. However, in the case of isolated grounds, the desired resistance measurement on the clamp-on meter would be extremely high (open) to indicate that current only traveled successfully in one direction. Then, a two-point test can be used to validate that there is a continuous path for the isolated ground.  A clamp-on meter can provide key insights into possible issues such as leakage current and corrosion.
 For a video of this podcast, please visit our YouTube Channel at E&S Grounding Solutions. For more information or to sign up for some of our world-renowned educational classes, please visit our website at www.ESgrounding.com

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In this episode, E&S Grounding Solutions President David Stockin concludes a two-part series on resistance to ground measurements by discussing the induced frequency test, often called the “Clamp-On Method."  In this method, a comparison is made between an induced current and a return current, while the test voltage is held constant. When the meter is clamped on to an electrode that is in series with a massive resistance loop with many parallel resistances, the meter can display a resistance that is approximately near the resistance to ground of the electrode under test. If electrodes of interest are accessible via test wells, the clamp-on method can be helpful for maintaining the grounding system by examining the change in resistance over an extended period of time, or by measuring the amount of current in the grounding system. For a video of this podcast, please visit our YouTube Channel at E&S Grounding Solutions. For more information or to sign up for some of our world-renowned educational classes, please visit our website at www.ESgrounding.com

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In this episode, E&S Grounding Solutions President David Stockin discusses the Wenner four-point method for testing soil resistivity. Selecting proper spacing of the four test probes must be considered when measuring the resistivity at various depths into the earth. It is important to investigate how the measurements may differ between seasons and weather conditions. The results of a soil resistivity test employing the Wenner method are an essential part of the soil model used when studying how fault current dissipates in the earth through the grounding system, and how personnel can be protected from dangerous step and touch potentials. For a video of this podcast, please visit our YouTube Channel at E&S Grounding Solutions. For more information or to sign up for some of our world-renowned educational classes, please visit our website at www.ESgrounding.com

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In this episode, E&S Grounding Solutions President David Stockin chats about three tests commonly used to test a grounding system. A four-point test reveals properties about the soil surrounding the grounding system. A three-point test can be used to measure the resistance from one or more metal electrodes to the earth. A two-point test helps to confirm that an electrically continuous (very low impedance) path exists throughout the grounding system. The results of each test offer key insights into assessing the performance and safety of a grounding system. For a video of this podcast, please visit our YouTube Channel at E&S Grounding Solutions. For more information or to sign up for some of our world-renowned educational classes, please visit our website at www.ESgrounding.com

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