Principle Loop Resistance; Measurement Loop Resistance - TCS Carus Origo CAI2010 Product Information

 Do not use more than 20 indoor stations per strand. For systems with
more video indoor stations plan to use video distributors (FVY1200,
FVY1400).
 Up to 64 front-door stations (16 of them video front-door stations) and
almost an unlimited number of indoor stations can be connected within
one system polarity-free (a/b; polarity-free only in 6-wire operation).
Thus, a suitable power supply and control unit is to be used.
Table 1: loop resistances
length of the
line a-b/ M-P
in m
10
20
30
40
50
60
70
80
90
100

Principle loop resistance

None of the devices (AS, IS or FE) should
ever be located more than
from the power supply and control unit (VS).
34
0.6 mm
loop resistance in Ω
1.28
2.55
3.83
5.10
6.38
7.65
8 Ohm
away
cable diameter

Measurement loop resistance

 Switch off the 230 V / 50 Hz of
the VS.
 Install the a-b short-circuit at
VS.
 Other devices do not disturb the
measurement and can stay
connected.
0.8 mm
0.71
1.43
2.14
2.86
3.57
4.29
5.00
5.71
6.43
7.14