12. When additional grounding rods must be installed to get the minimum required ohm reading, what
is the minimum distance, in feet, that they must be apart?
A.
3
B.
6
C.
9
D.
12
13. What should soil be chemically treated with when trying to get a better ohm reading?
A.
Copper plate
B.
Lead sulfate
C.
Copper salt
D.
Rock salt
1-15
EN 5144
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