Amprobe AT-4000 Series Advanced-Wire-Tracer - Manual (Page 15)

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Attach one clip to the faulted wire and the other one to ground. 2.
Press the signal level push button and select the appropriate level. 3.
If possible, ground all adjacent conductors. 4.
The R-4000CON receiver can then be used to trace the wire. The 5.
signal should remain relatively constant until you pass the ground
fault. At the fault, the signal from the T-4000 will pass from the
wire and disperse into the ground. For this reason, the signal
strength will decrease gradually. Watch the LEDs carefully in order
to locate the fault within a few inches. (Refer to Figure16)
Tracing Wires in Conduit
When seeking a ground fault within metal conduit, the ‘ground’ is the
conduit. Connect one of the clips to the conduit to complete the circuit.
Steel conduit will tend to attenuate the signal strength so tracing
will require higher sensitivity levels and access to within a few feet
of the conduit. Aluminum conduit will severely attenuate the signal
and sometimes even blocking all the signal from the wire. It may be
necessary to periodically access the wire in the conduit to confirm
signal presence.
Locating Circuit Breakers or Fuses
Caution: Always check to make sure the line voltage DOES NOT EXCEED
the range of the T-4000: 9-600V
Connect the T-4000 to the circuit as shown in Fig.17 using either the 1.
C2901 pigtail Cord set for 110V receptacles or the C2902 Alligator
Clip cord set.
Turn ‘ON’ the unit.
2.
Select a signal level by pressing on “Signal Level” push button. 3.
Turn ON the R-4000CON receiver. 4.
Select the ‘Short Range’ and ‘Low’ sensitivity. 5.
Move the Receiver in front of the outside of each circuit breaker, as 6.
shown, to determine which one has the strongest signal.