What is Resistance to Ground Measurement? (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 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.
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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