Tracing Wires In Conduit; Locating Circuit Breakers Or Fuses - Amprobe AT-4000 User Manual

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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 sensi-

tivity 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.

Caution: Always check to make sure the line voltage DOES NOT EXCEED the range of

the T-4000: 9-600V

1. Connect the T-4000 to the circuit as shown in Fig.17 using either the C2901 pigtail

Cord set for 110V receptacles or the C2902 Alligator Clip cord set.

2. Turn 'ON' the unit.

3. Select a signal level by pressing on "Signal Level" push button.

4. Turn ON the R-4000 receiver.

5. Select the 'Short Range' and 'Low' sensitivity.

6. Move the Receiver in front of the outside of each circuit breaker, as shown, to determine

which one has the strongest signal.

7. If two or more breakers produce the same signal strength indication. Move the

receiver away slowly from each of them and watch the indication level.

(Refer to Figure 17)

Fig.17 Identifying Circuit Breakers

R-4000

T-4000

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