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This is the earthing resistance of grounding electrode RA. To understanding the formulas above, we can regard these three grounding electrodes as a triangle, then the measured resistance is: Measured resistance = (Resistance of adjacent side 1 + Resistance of ad」acent side 2 - Resistance of opposite side)+ 2 The resistances of the two reference grounding electrodes are: RB=Rl-RA,...
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