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Figure 9.4.5 DEHNventil installed in a switchgear cabinet for pro- Figure 9.4.6 DEHNconnect terminal blocks with integrated surge
tecting the power supply systems protection for protecting the complete measuring and
control equipment

applications (for more detailed information, please also see
brochure DS 649 E “Red/Line Selection Guide”).

Surge protection for information technology systems
The entrance point into the building serves as a transfer point
between all information technology lines and the sewage
plant. At this point, lightning current carrying SPDs (category
D1), e.g. of type DRL 10 B 180 FSD, are installed. The lines
are directly routed from this transfer point to the switch-
gear cabinets and are connected there. According to the risk
analysis, the incoming lines for the 20 mA signals and the
telecontrol system must be protected by adequate arresters
from the DEHNconnect or BLITZDUCTOR series. These SPDs can
be installed in conformity with the lightning protection zone
concept (category C2) and are compatible with the system
(Figures 9.4.6 and 9.4.7).
This ensures a consistent surge protection concept for the in-
formation technology lines.
Additional applications for protecting sewage plants can be Figure 9.4.7 DEHNconnect surge protection devices; lines entering
found in brochure DS 107 E which can be downloaded at from the double floor
www.dehn-international.com.

www.dehn-international.com LIGHTNING PROTECTION GUIDE 289