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Potential equalization and overvoltage protection Electrical connections
In order to avoid this, the potential equalization bars of
the buildings should be connected with a thick
potential equalization cable.
Observe national requirements for detailed spec-
ifications and minimum cross-sections of the
lines.
Standardized lightning and overvoltage protection
Overvoltage protection that complies with local
conditions, legal requirements and regulations is
recommended for connections between buildings in
addition to potential equalization.
The installation of overvoltage protection may
only be carried out by a specialist.
The overvoltage protection concept must include the
following levels:
• Coarse protection (e.g. lightning rods)
• Medium protection (e.g. integrated distribution
devices)
• Fine protection, if necessary (e.g. power strips with
overvoltage protection)
The protective effects build on each other and are
effective only as a complete overvoltage protection
concept.
WARNING!
Maximum length of CAN bus lines
If the maximum length of the CAN bus lines is not
complied with, the ETAtouch control panel's software
interface may not be displayed correctly.
Ensure that CAN bus-lines do not exceed the
maximum total length of 400 m.
The maximum total length of the CAN bus line is
reduced by 30 m for each overvoltage protection
module.
When using a 4-line control system, an additional
protectively insulated mains adapter is required.
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