24
Table: Loop resistance
Cross section
Wire length
in m
0.6 mm
0.8 mm
Loop resistance
in
Ω
10
1.22
0.69
20
2.45
1.38
30
3.67
2.07
40
4.90
2.76
50
6.12
3.44
60
7.35
4.13
70
8.57
4.82
80
9.80
5.51
90
11.02
6.20
100
12.24
6.89
150
18.37
10.33
200
24.49
13.78
250
17.22
300
20.66
Principle of loop resistance
Measuring loop resistance
Rule:
No
door communication device
shall have a longer
distance from the
power supply & control unit
than
20 Ohm !
Rule:
Turn OFF 230 V / 50 Hz of the VS.
Connect a and b short circuit at the VS.
All other devices do not disturb the measuring proc-
ess and remain connected.
20 Ohm:
160 m wire length AS-VS (IS-VS) at a cross section
of 0.6 mm
300 m wire length AS-VS (IS-VS) at a cross section
of 0.8 mm
AS. Outdoor station
IS: Indoor station
VS: Power supply and control unit
Cleaning
!
Avoid the penetration of water into this device!
Do not use any aggressive or abrasive cleaning supplies!
Please clean the device with a dry or slightly moist rag.
Intense dirt can be removed with a mild cleaning supply.
connect a, b
