AEMC 3640 User Manual
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Contents
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Digital Ground Resistance Tester Model 3640 and 4610 13CHAPTER 4OPERATION4.1 Grounding Electrode ResistanceFigure 3 illustrates a grounding rod. The resistance of the electrode hasthe following components:• the resistance of the metal and that of the connection to it• the contact resistance of the surrounding earth to the electrode• the resistance in the surrounding earthMore specifically:A) Grounding electrodes are usually made of a very conductive metal(copper) with adequate cross sections so that overall resistance isnegligible.B) The National Institute of Standard and Technology (N.I.S.T.) hasdemonstrated that the resistance between the electrode and thesurrounding earth is negligible if the electrode is free of paint,grease or other coating, and if the earth is firmly packed.Ground Rodand ClampContactResistanceBetween Rodand SoilConcentricShells ofEarthFigure 3 |
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