Triplett Fox & Hound Jr. – PN: 3375 - Manual (Page 29)

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ability to locate the target wire. Terminating a
wire or line in a low impedance also reduces
signal amplitude and the HOUND Jr’s locating
ability. It is also possible for wire dress to cause
nullification of the field. This may happen with
tightly twisted pairs of wires.
If the target wire is connected to other wires
and circuits, for example, to switches, lights,
relays, transformers, etc., the FOX Jr warble
TONE will pass through these devices and out
onto other wires connected to these devices ...
making tracing of the target wire very difficult,
if not impossible.
The FOX Jr and HOUND Jr cannot be used to
trace wires buried underground or in concrete.
This is because the moisture content of the earth
or of concrete allows the surface to be electri-
cally conductive, causing it to act as a shield
around the buried wire.