● Route signal cables and data cables separately from the power cables.
–
Separate cable ducts or cable bundles.
–
The distance should be 20 cm or greater.
● Lay signal and data cables close to earthed surfaces.
6.2.3 Cable shields
● Use only shielded data cables. The shield should be grounded at both ends.
A cable shield only grounded at one end can only protect from capacitively coupled interfer-
ence and low-frequency disturbances (50 Hz hum).
● Avoid parasitic currents flowing through the cable shields.
This can be done by installing current-carrying equipotential bondings.
● Use only cables with braided shields.
Foil shields are not robust enough, cannot be contacted well and have poor HF properties.
● Use only metallic or [metal]-plated plugs for shielded data cables.
● Use only shielded cables for analog signals.
For small signals ground the shield only at one end.
● Ground the cable shield directly with a clip when entering the control cabinet.
Do not cut the shield until the cable reaches the module connected.
The connection between the PE bar and the shield bar must have a low impe-
dance.
6.2.4 Control cabinet
Installation of configurations in shielded cabinet can be required in shipping
applications. Follow specific instructions in the applicable type approval certifi-
cate.
1.
Open landing page of the product e.g.
2.
In the middle of the page, click on
[Downloads]
.
ð
A two-column window opens on the page with all available documents.
3.
In the left column of the downloads page click on
[Certificate]
.
ð
All available certificates are listed in the right column.
In the list of certificates, the maritime certificates can be identified by the title. The title consists
of the abbreviation of the maritime classification society followed by the words: Type Approval
Certificate. E.g. "DNV Type Approval Certificate: ...".
The connections between the control cabinet, the mounting plates, the PE bar and the shield
bar must have a low impedance.
Ground the control cabinet doors with short and highly flexible conductors.
Only use lighting with interference suppression.
Available certifi-
cates can be
found in the
internet
Connections
Grounding
Control cabinet
lighting
Wiring
EMC-conforming assembly and construction > Control cabinet
2023/03/03
3ADR011074, 1, en_US
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