30
Table 1: Loop resistances
Length of the line
a-b/ M-P in m
Line diameter
0.6 mm
0.8 mm
Loop resistance
in Ω
10
1.28
0.71
20
2.55
1.43
30
3.83
2.14
40
5.10
2.86
50
6.38
3.57
60
7.65
4.29
70
5.00
80
5.71
90
6.43
100
7.14
Principle loop resistance
Measurement loop resistance
None of the devices (AS, IS or FE)
should be further than
8 Ohm
away
from the power supply and control unit
(VS).
Switch off the 230 V / 50 Hz of the
VS.
Install a-b short-circuit at the VS.
All other devices are not disturb-
ing the measurement and can
stay connected.
8 Ohm:
ca. 65 m distance AS-VS by 0.6 mm
diameter
ca. 115 m distance AS-VS by 0.8 mm
diameter
AS front-door station,
VS power supply and control unit,
IS indoor station,
FE extended function
short-circuit
a, b here
kurzschlie-
ßen
