others to replace auxiliary earthing rods C(H),P(S), and pay attention to
remove oxide layer on the connection point of the selected metal auxiliary
earthing object when making measurement.
Wire connection is as following figure, and refer to 4-wires
measurement for other operations.
2-wires 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, that is:
R=RX＋re
In which:
R 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
Black
Red
Transformer
Measured
Grounding
Commercial
Grounding
Secondary
side
Primary
side
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