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Introduction
General rules
Installation box
mechanical design
Device order
Screens
Exception
Siemens
Building Technologies
5.4
EMC compliant installation box
One duty of the installation box is to reduces electromagnetic interference. The
influence depends on the internal and/or external EMC disturbances of the
installation box.
The internal EMC disturbance can be, for example, an inverter in the same
installation box; an external disturbance a nearby RF transmitter.
The installation boxes are the reference point for shielding cables and housings.
They must decouple faults and short-circuit surges.
The following generally applicable rules apply to an EMC compliant installation box:
• Interior walls cannot be painted if difficult EMC conditions prevail.
• Grates and rails must be conductive and may not be painted.
• Screws are attached directly on blank areas in the installation box.
• Grounding connections with doors through flat copper banks (eventually
including a connection to normal protective grounds).
Strongly disruptive devices must be separated as far as possible from victim when
setting up the installation box. Special attention must be placed on the connections
between the two device groups:
• Use separate installation boxes for strong disturbances and victims.
• Place stronger source of disturbances outside the installation box. Do not violate
safety requirements.
• Separate the device groups within the installation box with a separating plate.
• Cable screens must be installed as close as possible to the installation box
insert on its metal structure and connected to the building's potential
equalization.
• Screen connection terminals must be used and suitable installation space be
provided to this end
(see drawing on Page 19).
Using screens to power the TX-I/O modules: See TX-I/O engineering and
installation, CM110562.
Mounting and installation
Installation box TRA
17 / 56
CM111043en_03
2013-02-23
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