14
loop resistance (the two conductors in series).
e.
The resistance to the fault is the loop resistance divided by 2. To calculate the
distance to the fault in feet, refer to the table below for feet per ohm of resis-
tance.
Table 5. Feet Per Ohm of Resistance
f.
Select the “Feet Per Ohm” value for the line conductor gauge and multiply it
by the resistance to the fault.
Distance to Fault =
Loop Resistance
x Feet Per Ohm
2
g.
The actual distance may be shorter than calculated due to the unknown
resistance of the fault itself, if any, which will be included in the loop resis-
tance.
h.
When calculating distance to a ground fault (refer to table 5), only one con-
ductor is being measured. Do not divide the measured value by 2. Consider
the possible additional error that may be due to the unknown resistance of
the ground path as well as that of the fault.
18.
OPERATOR MAINTENANCE
This section describes how to maintain the Instrument in good operating condi-
tion. This Instrument is carefully designed and constructed with high quality com-
ponents. By providing reasonable care and following instructions in this manual,
the user can expect a long service life of the Instrument.
Servicing, other than described in this Section, should be performed only by one
of the Authorized Service Centers, or by the factory.
18.1
Inspection For Damage Or Deterioration
Examine the Instrument and its test leads frequently for damaged or deteriorated
insulation that may expose internal metal parts that may be a shock hazard.
Replace any damaged components before using the Instrument or allowing oth-
ers to use it.
If the Instrument panel and/or test leads become soiled, clean them with a clean
rag dampened with a mild, detergent-water solution. Rinse with a clean water
dampened cloth, and dry thoroughly. Do not allow liquid to enter the Instrument
case.
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