Eaton SEFELEC 5 Series, User Manual

Page: 68 / 209

User manual SEFELEC 5x Series 67 v1.06
SELECTION OF THE MEGOHM PER KILOMETRE MODE
The device proposes to indicate values of resistance of cables expressed in insulation per kilo-
metre, as this formulation is the one generally used in manufacturers’ specifications or stand-
ards. The cables can be comprised of several independent conductors connected in parallel for
the measurement; the device recalculates the value for 1 conductor.
The insulation value displayed is the result of the following calculation:
R.displayed = (R.measured x Length in metres x no. of conductors) / 1,000
Press the active area of the "Megohm.km" line to activate and setup this mode:
Enable or disable the Megohm x km mode by selecting ON or OFF.
Then enter the length of the cables in metres and the number of cables in parallel.
For example:
A cable 100 metres long with 5 conductors in parallel gives a value of insulation of 500 MΩ in
normal mode.
If we activate the Megohms per kilometre function, we obtain a displayed value of:
R.displayed = (500
MΩ x 100
m x 5) / 1,000 = 2,500
MΩ.
k
m = 2.5 GΩ.
km