
EMC Measures for the Communications Adapter
20
24
A.1 Overvoltage Protection for Remote Bus Lines
(lightning protection)
To protect transmission systems from flashover voltage surges (e.g. lightning),
the remote bus line should be equipped with overvoltage protectors (lightning
arrestors) whenever it is installed outside a building. The nominal discharge
current should be at least 5 kA, for instance by using a type ARE, Cat. Nr. 919 232
made by
Dehn und Söhne
Postfach 1640
92 306 Neumarkt, Germany
or Dehn und Söhne
Hans- Dehn- Str. 1
92 318 Neumarkt, Germany
Protecting a remote bus cable requires three ARE lightning arrestors per building.
Figure 5 Circuit layout and dimensions of the ARE lightning arrestor
88
35517.5
45
90
IN
OUT
3
4
OUT
1
2
IN
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