we have earthmat at 110KV substation.we would like to take earth resistance.b

we have earthmat at 110KV substation.we would like to take
earth resistance.b some says that by connecting earth megger
terminals (C1,P1) at middile point of earthmat (at riser)
will cause voltage gradient at other earthmat nods and dont
get exat earth resistance.when connecting at end nods will
get exat value . is it correct .please explain

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