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8.5 Group bus and ward bus (code: c)<br />
The group bus and the ward bus must be wired up in a line topology.<br />
CONCENTO PLUS - <strong>Technical</strong> <strong>Manual</strong>, 11/12 (Rev. 3.0), 00 8814 14<br />
8. Laying cables<br />
Warning! No stub lines may be installed for the group bus and for the ward bus.<br />
All devices must be directly connected to the bus.<br />
For laying the group bus, use what is available on location (distribution cabinet,<br />
cable shaft).<br />
The cables of the nurse call system and the power system must be laid with a<br />
minimum spacing of 30 cm. In the case of shorter sections of less than 10 m,<br />
a spacing of 10 cm is regarded as sufficient.<br />
230 V / 400 V AC<br />
Spacing > 30 cm<br />
Power system cable<br />
Nurse call system cable<br />
Nurse call system cables that leave the building must have overvoltage protec‐<br />
tion in accordance with DIN VDE 0845 at the exit point. There is no need for this<br />
overvoltage protection if a galvanic isolation point reliably prevents the crossing<br />
of hazardous voltages.<br />
8.5.1 Cable types<br />
8.5.1.1 System with speech<br />
In a system with speech transmission, install an installation cable of the type<br />
IY(ST)Y 4x2x0.8 mm for the group bus and for the ward bus.<br />
8.5.1.2 System without speech<br />
In systems without speech transmission, it is sufficient to install an installation<br />
cable of the type IY(ST)Y 2x2x0.8 mm for the group bus and for the ward bus.<br />
However, as with the speech transmission system, it is urgently recommended<br />
to install the type IY(ST)Y 4x2x0.8 so that there is a possibility for subsequent<br />
upgrading to speech transmission.<br />
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