Ground Resistance Tester Models 3711 and 3731
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Note: A high reading or OL indicates one or more of the following:
A. Poor ground rod
B. Open ground conductor
C. High resistance bonds on the rod or splices on the conductor; watch
for buried split butts, clamps, and hammer-on connections.
Service Entrance or Meter
Follow the same procedure as for Pole Ground Rods. Notice that Fig. 24
shows multiple ground rods and in Fig. 23 the ground rods have been
replaced with a water
pipe ground. You may
also have both types
acting as a ground. In
these cases, it is
necessary to make the
measurements between
the service neutral and
both grounded points.
Water pipe
Service box
Service meter
Pole-mounted
transformer
Building wall
Figure 23
Figure 24
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