-12-
Simple method for measurement of earth ground resistance, its reading
on Tester is the total value of earth ground resistance value of measured
earthing object and that of commercial earthing object, namely:
RE=RX＋re
In which: RE is the Tester reading value;
RX is the earth ground resistance value of measured earthing
object;
re is the earth ground resistance value of common earthing
object like commercial use power system.
Then, the earth ground resistance value of measured earthing object is:
RX=RE－re
Adopting simple method for measurement of earth ground resistance
shall try to select the earthing object with low value as the auxiliary earth
ground electrode and thus the tester reading value can be more
approaching to true value. Please take precedence in selecting metal
water pipes, fire hydrants as auxiliary earth electrode when measuring,
and refer to the following figure for application.
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