Faults Less Than 100 Metres From Testing End - BT 301B Handbook

6. FAULTS L ESS THAN 100 METRES FROM TESTING END
6.1
The procedure to be followed is the same as in section 5, but because of the short distance to the
fault, the fault pulse may not be distinguishable from the transmit pulse, as shown in Fig. 10. To
overcome this difficulty either install a length of jumper wire measuring 100 metres or the artificial
line between the line terminals and the pair under test.
6.2
If a length of jumper wire is installed, then this length of wire must be subtracted from the displayed
reading to give the true fault location, i.e.:-
DISTANCE TO FAULT = DISPLAYED READING- LENGTH OF JUMPER WIRE
If the artificial line is used, then the distance, shown on the artificial line (see Fig. 12) must be
subtracted from the displayed reading to give the true fault location, i.e.:-
DISTANCE TO FAULT= DISPLAYED READING - 0.184 km - see Fig. 12.
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