There are several techniques you can use to maximize
your chances of success with inductive locating.
1. The signal induced onto a line
will be strongest when the transmitter’s antenna
is in-line with the conductor (utility). Transmitter
cases have arrows to help you align the unit properly.
2. Aim the signal away from adjacent
non-target utilities and overhead lines (see illustrations).
3. When you have a non-target conductor
that’s located next to your target conductor,
you can lay the transmitter on its side so that the
signal NULL is directed at the non target conductor
but still energizes the target.
Sometimes transmitters can illuminate a vertical power
line which is closely fastened to a pole when a clamp
cannot be placed around it.
Things to Remember
• A direct connection is always your best bet.
Next best is using an inductive clamp to help isolate
the line and as a last option inducing onto a line
using the transmitter’s coils.
• Be aware and test for Air Coupling. You need
to detect the signal from the line underground and
not from the transmitter through the air.
• Watch out for overhead lines if inducing with
• Experiment and try different positions and
frquencies to help isolate the target conductor.
• A good “Best Practice” when locating
is to trace out to a known termination point and mark
the line on the way back to the transmitter. This
practice is especially important when using induction
to energize the underground line as it is more difficult
to tell what you are tracing. Following to a known
termination point helps verify you are tracing the