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Load side
Since normally a 230 V consumer is on the load side,
using VDE-conforming installation wires, such as e.g.
NYM wiring, etc. is required.
The wire cross-sections conform with the standard
VDE regulations and is 1.5 mm
2
for installations in the
nominal load range of actuators.
Control side
On the control side however, only non-hazardous safe-
ty extra-low voltages are used.
Since there is electrical isolation between the load and
control sides in the module, no mains power capable
wires have to be used.
Using interior telecommunications wiring or compara-
ble control wiring is recommended.
Make sure however, that the wires of the load and the
control side are separated conforming with VDE regu-
lations within the sub-distribution.
Keep a minimum spacing of 8 mm between the two ty-
pes of wiring.
When connecting the RS485 bus, the A terminals
(1.3), the B terminals (1.7), the 24 V power supply
and the ground terminal (1.8) of the modules of a sub-
distribution (max. 127 segments) are to be connected
with one another.
When using several modules, a bus termination is re-
quired. Information on the connections is provided in
the respective operating instructions.
5.2 Topology of the bus system
The HomeMatic Wired components should always be
mounted in groups of sub-divisions to provide a better
overview.
The number of sub-divisions that is appropriate de-
pends on the type and size of the project and is to be
defined accordingly.
Installing at least one sub-division on each level is re-
commended.
Larger buildings may require planning several sub-divi-
sions per level (e.g. separate for every floor).
All load and control wiring should also be run in a star
format to the respective sub-divisions. The power sup-
ply is done through a DIN rail power supply HMW-Sys-
PS7-DR or another 24 V power supply dimensioned
according to the number and total current consumption
of all existing modules in the respective sub-division.
If central programming and control is to be done
through the HomeMatic Central Control Unit, the