Ground Resistance Tester Models 3705
- 22 -
Phone Pedestal
Provide sufficient room for the Model 3705 jaws, which must be able to
close easily around the conductor (Fig. 18). The jaws can be placed
around the ground rod itself.
Note:
If not enough room is available for this task refer to Fig. 19 and
continue with this example. The clamp must be placed so that the jaws
are in an electrical path from the sheath bond(s) or ground bar to the
ground rod(s) as the circuit provides.
The reading you measure with the 3705 indicates the resistance of not
just the rod, but also the connection to the sheath ground and all bonding
connections between the sheath bond and the rod.
A high reading 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. Also
look for bad connections on the ground bar to the sheath(s).
Note:
This same test can be done using the TIP instead of the sheath
ground. However keep in mind that this is intended to be grounded only
back at the central office.
