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Thursday, November 10, 2011

What is the difference between earth resistance and earth electrode resistance?


What is the difference between earth resistance and earth electrode resistance?
Answer:Only one of the terminals is evident in the earth resistance. In order to find the second terminal we should recourse to its definition: Earth Resistance is the resistance existing between the electrically accessible part of a buried electrode and another point of the earth, which is far away.
The resistance of the electrode has the following components:
(A) the resistance of the metal and that of the connection to it.
(B) the contact resistance of the surrounding earth to the electrode.

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