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Installation example
L
N
AC 230 V
AC 24 V
24V~
F1
...A
N1
Key
Siemens
Building Technologies
7.2
Wiring for AC 24 V
This section describes the wiring between the transformer and power point(s)
(Room automation station, power module, bus interface module).
The following diagram illustrates basic wiring for power lines for modular room
automation stations using AC 24 V operating voltage as per PELV:
Installation box 1
T1
K
F3
F4
U1
X1
F5
T, T2
Safety transformer AC 230 V / AC 24 V as per EN 61 558.
K
Terminal block for star distribution of AC 24 V and ⊥.
N1
DESIGO PXC3 room automation station.
N2
Room automation station PXC3, with separate power AC 24 V
(looped power from T1 admitted but not recommended).
U1
Power supply module TXS1.12F10
X1
Bus interface module TXS1.EF10
F1, F2
Low-voltage fuse, for max. power with AC 24 V.
F3
10 A fuse holder in the PXC3
F4
10 A fuse holder in power module.
F5
10 A fuse holder in the bus interface module.
Mounting and installation
Wiring for AC 24 V and island bus
Installation box 2
L
AC 230 V
AC 24 V
24V~
F2
...A
N2
X1
F4
N
T2
CM111043en_03
2013-02-23
AC 24 V
Island bus
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