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

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