ARS31(Pro)-UMB
Operating Manual V9/03.2017
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
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5.2.1 Enlarging the cable (for example 100m):
Important: the original cable must be shortened and extended from the shortest possible
distance (5m roadside). The loop resistance of the overall cable must not exceed 5
Ω!
Figure 3: Cable Extension
For example, extension of 100 m with a 0.5 mm² cable of 73.2
Ω/km loop resistance and
parallel connection of 4 cores each:
Per core 100 m cable results in a loop resistance of 7.3
Ω.
By parallel connection of 4 cores results in a loop resistance of 7.3
Ω / 4 = 1.83 Ω
Figure 4: Example of an Extension Box
