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Precise Measurement for Earth Resistance
(Precise Measurement Method, Three-pole Method)
Measurement of large-scale earthing electrodes
When measuring a large-scale earthing electrode such as a mesh earthing
electrode, ring earthing electrode, or earthing electrode provided by a
large building structure, it cannot be accurately measured since the H(C)
electrode and S(P) electrode come inside the earth resistance area of E
electrode.
If long cables are used to avoid the H(C) electrode and S(P) electrode
getting inside the earth resistance area, accurate measurement cannot be
carried out as it is signicantly affected by noise.
Generally, measurement of large-scale earthing electrode requires a large
measurement current of approx. 20 A. Use measuring instrument designed
for measuring large-scale earthing electrodes for this measurement. (No
measuring instrument available for this purpose from Hioki)
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