A good grounding system (also known as an earth
electrode system) is important for the protection of an
overall system facility. There are many factors that
determine how well a grounding system performs. Two
major parameters are its resistance to remote earth and
the resistivity of the local soil. Each of these values can
be measured to help determine and design the best
solution for the grounding system.
For the more details
Grounding_Measurements
Arth-resistance-testing-book
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