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Siemens
Installation guide RXB, RXL
CM110381en_01
Building Technologies
Periphery wiring (without bus)
28 Feb 2009
Cable designation
A
∅
R
Cable length Lmax [m]
VDE / DIN
AWG [mm2]
[mm]
[
Ω
/km]
8.5 VA 9.5 VA 13 VA
20 VA
40 VA 60 VA
80 VA 100 VA 120 VA
10 5.26 2.59
3.8 420 - 280 180 90 60 45 36 30
YSLY
4.00 2.26
5.0 320 - 210 138 69 46 34 28 23
12 3.10 2.05
6.3 250 - 165 108 52 36 26 21 18
YSLY
2.50 1.80
8.0 200 167 130 86 43 29 22 17 14
14 1.95 1.62
11 160 130 100 68 34 22 17 13 11
LiYYP
1.50 1.40
14 120 100 80 52 26 17 13 10 8.5
16 1.23 1.30
16 100 82 65 42 21 14 10 8.5 7.0
LiYYP
1.00 1.15
20 80 67 53 34 17 11.5
8.6 6.9 5.5
18 0.96 1.02
21 78 64 51 33 16 11.0
8.3 6.6 5.5
LiYYP
0.75 0.98
26 61 50 40 26 13 8.6 6.5 5.2 4.3
20 0.56 0.81
33 45 37 30 20 10 6.4 4.8 3.8 -
LiYYP
0.50 0.80
39 40 33 26 17 8.5 5.8 4.3 - -
22 0.34 0.64
56 28 23 18 12 5.8 3.9 - - -
LiYYP (G51 / G87)
0,28
0.60
64
22
19
15
9.7
4.8
-
-
-
-
LiYYP 0.25
0.57
77 20
- 13
8.6
- - - - -
24
0.22
0.51
85 18
- 11.5
7.6
- - - - -
26
0.15
0.40
130
12
- 8.0
5.2
- - - - -
LiYYP 0.14
0.39
138
11
- 7.5
- - - - - -
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.
STOP
Caution!