Ground Resistance Tester Models 3705
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Field Applications
Pole Ground Rods
Remove any molding covering the ground conductor, and provide
sufficient room for the jaws of the clamp-on. The jaws must be able to
close easily around the conductor. The jaws can be placed around the
ground rod itself.
Note:
The instrument must be placed so that the jaws close around an
electrical path from the system neutral or ground wire to the ground rod
or rods as the circuit provides.
The reading you measure with the clamp-on tester indicates not just the
resistance of the rod, but of the connection to the system neutral and all
bonding connections between the neutral and the rod.
Note that in Fig. 11 there is both a butt plate and a ground rod. In this
type of circuit, it is necessary to place the instrument above the bond so
that both grounds are included in the test. For future reference, note the
date, ohms reading, and pole number. Replace any molding you may
have removed from the conductor.
Figure 11
