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Signal Wiring; Additional Notes For Room Devices - Siemens Desigo RXB Technical Manual

Technical manual.
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Cable designation
[mm 2 ]
VDE / DIN
AWG
10
YSLY
12
YSLY
14
LiYYP
16
LiYYP
18
LiYYP
20
LiYYP
22
LiYYP (G51 / G87)
LiYYP
24
26
LiYYP
Caution!
STOP
Siemens
Building Technologies
A
R
[mm]
[Ω/km]
8.5 VA
5.26
2.59
3.8
4.00
2.26
5.0
3.10
2.05
6.3
2.50
1.80
8.0
1.95
1.62
11
1.50
1.40
14
1.23
1.30
16
1.00
1.15
20
0.96
1.02
21
0.75
0.98
26
0.56
0.81
33
0.50
0.80
39
0.34
0.64
56
0,28
0.60
64
0.25
0.57
77
0.22
0.51
85
0.15
0.40
130
0.14
0.39
138
3.1.4

Signal wiring

The following applies in common for signal wiring of field devices such as
temperature sensors, room devices, window switches, presence detectors, dew
point sensors or electrical buttons:
– Use stranded, 2 or multiple core round cables, without screen (standard off-the-shelf
installation cable).
– Single wires or ribbon cables may not be used.
– Signal wiring may be laid together with power lines (AC 230 V).
They must be isolated from the power lines per regulations. Isolation must meet
PELV requirements.
– Signal wiring can not be led in the same cable as the power lines.
3.1.5

Additional notes for room devices

– Most room devices have a tool connection plug for easy connection of the tool
(room controllers are often hidden went mounted). The room devices must be
connect with 2 strands each for KNX bus and PPS2 (4-strand, paired cable).
– We recommend wiring the KNX bus to room devices only where bus access with
a tool is actually needed. We do not recommend a general wiring of the KNX
bus to all room devices, since the open wiring may catch faults and increase the
total length of the bus cable (See Section 4.5.3).
– Cable type: 2-strand or 4-strand, paired, without a screen
(See Section 4.1)
– The PPS2 wire are interchangeable since polarity is not relevant.
– The KNX bus wire must be connected with the proper polarity.
– The simple wiring length between controllers, or controller and room device must
be considered for the overall wiring length of the KNX bus.
Installation guide RXB, RXL
Periphery wiring (without bus)
Cable length L max [m]
9.5 VA 13 VA
20 VA
420
-
280
180
320
-
210
138
250
-
165
108
200
167
130
86
160
130
100
68
120
100
80
52
100
82
65
42
80
67
53
34
78
64
51
33
61
50
40
26
45
37
30
20
40
33
26
17
28
23
18
12
22
19
15
9.7
20
-
13
8.6
18
-
11.5
7.6
12
-
8.0
5.2
11
-
7.5
-
40 VA
60 VA
80 VA
100 VA 120 VA
90
60
45
36
69
46
34
28
52
36
26
21
43
29
22
17
34
22
17
13
26
17
13
10
21
14
10
8.5
17
11.5
8.6
6.9
16
11.0
8.3
6.6
13
8.6
6.5
5.2
10
6.4
4.8
3.8
8.5
5.8
4.3
-
5.8
3.9
-
-
4.8
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
CM110381en_01
30
23
18
14
11
8.5
7.0
5.5
5.5
4.3
-
-
-
-
-
-
-
-
7 / 22
28 Feb 2009

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