This high resistance Cable Fault Locator has been designed to meet the requirements of engineers in locating cable
faults in the resistance range from zero to 200 mohms.
Faults can be between 2 conductors, a conductor and its metallic sheath, concentric neutral or earth.
10 turn Vernier balancing control is provided which indicates the fault position as a percentage of the total
loop length.
If both ends of the faulty conductor are not accessible at the test end then a good conductor of the same
cross-sectional area is required. If the good conductor is of a different size then a conversion factor may be
used to calculate an equivalent loop length.
Alternatively, a pair of conductors from an auxiliary cable may be used or, if the cable length is not too
great, an overland lead can be run out to enable the bridge test to be carried out. With this bridge
arrangement faults having resistances up to 200 mohms in dielectrics such as rubber and polyethylene
can be located with an accuracy well within 0.5% of the loop length and typically 0.1%, although this may be
limited by the non-uniformity of the conductor.