OVATION 5X00321G01 Input module

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(a) When testing earth resistance, remember that during fault conditions, dangerous voltages may exist between a system ground and a remote point being tested. Care should be taken when connecting leads and test equipment. Avoid as much contact with the leads and probes as possible. (b) Most of the earth resistance is located close to the grounding system due to the “hemisphere effect.” Around a grounding hemispherical electrode, the resistance of the soil is the sum of the series resistances of virtual shells of earth, located progressively outward from the electrode. The shell nearest the electrode has the smallest circumferential area or cross section, so it has the highest resistance. Successive shells outside this one have progressively larger areas, and thus progressively lower resistances.

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