Answer Posted / balaji

earth resistance is measured my earth megger instrument. it
has three terminals
1) earth
2) line
3) ground
in this ground is for meter protection and earth is meant for
point of starting of measurement , line is meant for point
until which the earth resistance to be measured
this works on principle that emf generated by the generator
is forms a close loop when the points between earth and line
conducts that is meter will indicate zero incase of the
failure of earth resistance

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