EMC Suitable Wiring
67
05/01 AWB2700-1384GB
5
Wiring:
Conductors should always be laid on both sides to assure good
attenuation of disturbances in the high frequency range.
The conductors should be laid on one side if only attenuation of the
low frequency range is necessary. One-sided installation is
advantageous if
• a bonding conductor cannot be installed
• Film shieldings are used
Potential Compensation
Potential differences can occur in installation components that are
in separate areas and which
X
are fed by different supplies,
X
are fed by different networks,
X
have double-sided conductor shields which are grounded on
different installation components.
The potential difference between data reference potentials DGND
of all connections (minimal wiring with shielding of two bus
subscribers) must not exceed ± 7 V. If this cannot be guaranteed
then a potential compensation must be created.
In the case of stationary bus operation, the shielded cable should
be insulated and laid on the shielding rail.
Fixing of the cable to the shielding rail should be carried out
using metal cable clips. These clips must cover the rail over a
large surface area. The cable must be routed directly after it
enters the switching cabinet to the shielding rail. Then, it has to
be routed to the connection point - without being laid again!
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