Emc Compliant Installation Box / Panel - Siemens Desigo TRA Engineering, Mounting And Installation Manual

Introduction
General rules
Installation box
mechanical design
Device order
Screens
Exception
20 / 84
Siemens
Building Technologies
5.4

EMC compliant installation box / panel

Below only installation boxes are mentioned. Panels are included.
One purpose of the installation box is to reduces electromagnetic interference. The
influence depends on the internal and/or external EMC interference.
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 reduce interferences 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 (devices that generate strong EMC interference) must
be separated as far as possible from TRA devices when setting up the installation
box. Special attention must be paid to the connections between the two device
groups as follows:
Use separate installation boxes for strong strongly disruptive devices and TRA
devices.
Place strongly disruptive devices 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/shield connection terminals must be used and suitable installation space
be provided to this end
(see drawing on Page 22).
Using screens/shields to power the TX-I/O modules: See TX-I/O engineering and
installation, CM110562.
Desigo TRA Engineering, mounting and installation
Installation box / panel for TRA
CM111043en_09
2016-02-22