Amprobe AT-4000 Advanced-Wire-Tracer - Manual (Page 16)

14
Finding Ground Faults
A ground fault is a direct connection of the conductor to ground. A typical ground fault
may cause a tripped circuit breaker or a blown fuse ( in contrast to an ‘open’, which
passes no current). In this situation, the B2024 battery can be used as the current
source. The high voltage from the B2024 will overcome a high resistance fault and will
produce a stronger signal. Also, you can use line voltage as the power source by
connecting the T-4000 across the breaker. (Note: When using the battery booster
(B2024 or B2025) the unit will work in ultra high “U-HI” mode only. Remove the bat-
tery booster to return to normal operation.)
1. Plug the alligator clip cord set into the T-4000.
2. Attach one clip to the faulted wire and the other one to ground.
3. Press the signal level push button and select the appropriate level.
4. If possible, ground all adjacent conductors.
5. The R-4000 receiver can then be used to trace the wire. The 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)
Fig.16 Finding Ground Faults
T-4000
B2024