Flamenco Technical Manual Revision 6.0 - Tunstall.de
Flamenco Technical Manual Revision 6.0 - Tunstall.de
Flamenco Technical Manual Revision 6.0 - Tunstall.de
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8. Laying the cables<br />
8.2 Electromagnetic compatibility (EMC)<br />
All electronic components of the nurse call system emission and sensibility values<br />
which are well within the prescribed parameters for electromagnetic compatibility<br />
(EMC). Nevertheless, interference with the nurse call system may occur<br />
in specific situations and due to insufficient interference suppression of<br />
fluorescent lamps - particularly in hospital installation units (medical supply<br />
units).<br />
Customers should make provisions which prevent such interference from external<br />
sources. In many cases, this type of external interference can be avoi<strong>de</strong>d<br />
by installing suppressor elements (varistor circuits). These varistor circuits are<br />
commercially available from the manufacturers. <strong>Tunstall</strong> offers a proven overvoltage<br />
filter 230 V (70 0890 97).<br />
The EMC properties of the various electro medical supply units may differ to a<br />
great extent. Even two supply units of the same type may act and react with<br />
consi<strong>de</strong>rable difference if they are wired in different ways.<br />
Normally, call systems are wi<strong>de</strong>ly distributed over the building, and their EMC<br />
behaviour is affected by the specific <strong>de</strong>sign and layout of the network.<br />
This situation should also be consi<strong>de</strong>red when effecting changes or amendments<br />
to existing medical supply units.<br />
8.2.1 Cables for high-voltage installations and cables for<br />
other systems with dangerous voltage<br />
Power cables for the nurse call system must not be laid along with the cables<br />
of high-voltage installations or with cables of other systems of high-risk voltage<br />
in common cables, conduits or cable trays.<br />
Cables for the nurse call system and high-voltage cables must be placed at a<br />
minimum spacing of 30 cm. For shorter distances of less than 10 m the spacing<br />
may be reduced to 10 cm.<br />
230 V / 400 V AC<br />
Cable for high-voltage system<br />
Spacing > 30 cm<br />
Cable for the nurse call system<br />
For laying nurse call system cables in medical supply units the regulations of<br />
ISO 11197:2004 have to be observed.<br />
52<br />
<strong>Flamenco</strong> - <strong>Technical</strong> <strong>Manual</strong>, 04/13 (Rev. <strong>6.0</strong>), 00 8812 60
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