01/2013
15
TCS TürControlSysteme AG, TCS Hotline Germany: [email protected]
Subject to technical changes.
Fax: +49 (0) 41 94 / 9 88 129
www.tcsag.de
PI_AMI1xx00_uk
General information on the conduit in TCS systems
TCS audio systems
The conduit of the lines is determined by structural conditions and is only limited by its
length.
Observe when selecting the cable length:
the loop resistance must not exceed 20
Ω (table)
To keep the max. permitted loop resistance, the
wire cross section can be doubled, that means,
that for one wire two cables are used (illustra-
tion). The lines have to be twisted.
When using shielded cables:
Connect the shielding with each other and put it
on mass (b-wire) on one side at the power sup-
ply.
Optional strand or star shaped wiring.
Table: loop resistances
Line length
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
8.93
5.00
80
10.20
5.71
90
11.48
6.43
100
12.76
7.14
150
19.13
10.71
200
25.51
14.29
250
17.86
300
21.43
Principle loop resistance
Measurement loop resistance
None of the devices (front-door station, indoor
station or extended function) should be further
than 20 Ohm away from the power supply and
control unit!
Procedure for measurement:
Switch off the 230 V / 50 Hz power supply and
control unit.
Install a/b short circuit at the power supply and
control unit.
Other devices are not disturbing the measure-
ment and can stay connected.
Measure the resistance at the strand at a/b of the
last indoor or front-door station.
