Ask the Grounding Experts

In this episode, E&S Grounding Solutions President David Stockin continues a discussion on the Wenner four-point method for testing soil resistivity. Sounding should occur at least to the extent of the sphere of influence, which can be determined from the diagonal length of the grounding system. Selecting the proper intervals of test probe spacing is important to avoid a mathematical headache and obtain more accurate models of the soil resistivity. IEEE Standard 80 suggests taking soundings at a depth of up to three times the extent of the sphere of influence. It is very important to know how to safely handle the high-power equipment used to get the deeper soundings. 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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In this episode, E&S Grounding Solutions President David Stockin chats about the difference between ground (earthing) and bonding.  OSHA defines grounding as the intentional connection of an object likely to become energized to earth. Bonding is to intentionally connect to objects likely to become energized, to ensure that there are no differences in potential. OSHA wants all fueling operations to have both "grounding" and "bonding" to ensure that no hazardous sparks could cause a fire.  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 GFCIs and circuit breakers.  Ground Fault Circuit Interruptor's (GFCI) or Residual Current Devices (RCD) are automatic circuit disconnection devices that measure the difference in amperage between the hot and the neutral conductors in a circuit. If a minimal current is detected it automatically disconnects power to the circuit. Where as traditional circuit breakers operate by sensing a temporary and very short duration maximum current, causing the device to automatically disconnect power to the circuit.  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 Stocking explains what a fault current path is.  The Equipment Grounding Conductor (EGC) or Protective Earth Conductor (PE) are mandatory conductors in both the NEC and IEC codes to ensure that circuit breakers and fuses will trip and protect the circuit. These conductors form an important part of the mandatory low impedance fault current path necessary for the proper functioning of automatic circuit disconnection devices.  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 Ground Solutions President David Stockin talks about lightning protection systems and whether or not they actually work. Lightning Protections Systems have been proven to be an effective method for protecting structures from lightning damage since the days of Benjamin Franklin. Providing an alternate and more conductive path to the earth for hazardous electrical lightning energy to travel on, typically in the form of a series of copper conductors, has been proven time and time again to protect our flammable buildings from fire and other objectionable effects of lightning strikes.  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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Interested in learning about electrical grounding and earthing electrodes?  In this episode, E&S Solutions President David Stockin discusses the various types of grounding rods, plates, conductors, footings, and rings found in the codes from around the world.  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 Ground Solutions President David Stockin  talks about the sphere of influence, which is a scientific theory that estimates the volume of soil utilized by a given earthing / grounding electrode system. The diagonal (maximum) below-grade length of the electrode system is equal to the radius of its sphere-of-influence.  Knowing the sphere of influence of a grounding / earthing system is useful for engineers and electricians when trying to improve the resistance-to-ground of an electrode 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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