Cathodic protection is said to be achieved when all the local action cathodes, on a metallic surface in contact with an electrolyte, are polarized negatively to at least the voltage of the most active local action anode.
Soil, being a conductor, has the electrical properties of resistivity and conductivity. Additionally, when AC current passes through soil, the soil can present a susceptance, or an imaginary portion of the admittance of a grounding element or a pipeline.
One method to estimate the remote earth impedance or resistance of an object such as a grounding system is to complete a Fall-of-Potential test.
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