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Thanks a lot. I will keep you posted as far as the design goes. Thanks again:)

Yes the 2 systems are going to be interconnected, but to design the second system, i need to now if i can use the resistivity value i get from the 4 points method test...because we all now that having a another grounding electrode this close ( 10 meter maximum) will improve my soil resistivity...

Thanks Guys, I do not have any result from the construction of the plant as this is a 1920 built plant... I am thinking about doing a fall of potential test to determine the equivalent ground impedance of the entire plant grounding system. But my real concern is whether or not the resistivity...

Hello every one. I am working on a ground grid for a new substation. But the generation plant is right beside the new substation. My question is how can i measure the resistivity of the area as there is an existing plant right there. Can i use the values I ll get from the 4 point method or are...