Heath Consultants Sure-Lock Utility Pro - Manual (Page 27)

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The coupler clamp is a unique tool that generally enhances the separation of the
signal as compared to conventional methods of energizing the trace conductor.
The coupler clamp is also an effective method of isolating a conductor from
interfering conductors in the area of search. It CANNOT be used on all tracing
applications. Since there is no grounding device in use with the coupler clamp,
the signal must be able to travel in both directions on the conductor. If the trace
point of attachment, the coupler clamp may not function. This “break” in the
continuity of the conductor creates an opening in the conductor loop that will not
allow the signal to propagate.
In such situations, this conductor loop must be closed. The coupler clamp comes
equipped with a bridging cable which can be used for this purpose. This cable is
used to “bridge” the break in continuity. The cable can be attached to bridge an
-
tected gas line with the insulator at the meter set (Figure 2-7). Caution must be
taken when using the bridging cable in such situations and it may be used only
after obtaining permission. It MUST be removed after the locate is completed.
In the event that the point of attachment is at the termination or dead end of a
conductor, the termination point must be grounded away from the directional run
of the conductor. Once this is accomplished, the signal is allowed to travel and
the coupler clamp will now function (Figure 2-8). Both ends of the conductor
may need to be connected to earth ground.
The coupler clamp is an ideal device for tracing cables as a direct connect hook-
up is often not possible without having to enter pedestals or junction boxes and
without making a metal-to-metal contact. The jaws on the coupler clamp must
be closed and completely encircle the conductor in order to function properly
(Figure 2-9).