13
PROBES AND ACCESSORIES continued
Shown here is a typical application
of the CFT-35 and associated equipment
for testing underground cable from
a pad-mount dead front transformer:
Before using the
CFT-35, read and
understand all of
the instructions and
precautions for live
testing with voltmeters/phasers
(pages 7 & 8). In addition, be
sure to consult your company’s work
practices and any information provided
by the manufacturers of the apparatus
that you are testing.
Testing using the CFT-35 should
be performed as follows:
1)Test the cable with the HDE voltmeter/phaser to ensure
that it is not energized and that it is discharged.
2)Ensure that the cable to be tested is completely
isolated; that both ends have no other connection
to voltage or to a transformer winding
and are properly terminated.
3)Assemble the CFT-35
with appropriate
probe on the
voltmeter/phaser
stick with the meter.
4)Assemble the appropriate probe on the voltmeter/phaser stick without the meter.
5)Connect the voltmeter/phaser stick without the meter to the cable to be tested.
5)Connect the voltmeter/phaser stick with the CFT-35 to the voltage source.
6)Read the display on the voltmeter/phaser. The reading will be initially high.
For a short cable, the reading should return quickly to near zero.
For a longer cable, it may take a few seconds for the reading to return to near zero.
8)If the reading does not return to near zero after several seconds, the cable is
leaking or shorted and the test should be discontinued. Remember that all HDE
voltmeters/phasers are intermittent duty devices and should be connected only as
long as necessary to obtain a reading.
9)Discharge the cable by removing the voltmeter/phaser from the line, removing
the CFT-35 from the voltmeter/phaser and connecting the voltmeter/phaser from
cable to ground.
Cable Fault Tester
and Bushing Probe
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