Siemens RS-485 Wartungshandbuch Seite 255

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Lightning and overvoltage protection of bus cables between buildings
B.3 Instructions for installing coarse protection
PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
255
B.3 Instructions for installing coarse protection
Basic protection
The coarse protection must be installed at the point where the bus cable enters the building
and connected to the building equipotential bonding system with low impedance.
The following are required to create the coarse protection:
The base section type no. 919506,
The protection module type B, type no. 919510 and
The shield contact terminals type no. 919508 are required.
To keep EMC* and environmental influences away from the coarse protection, this should be
installed in a protective enclosure type no. 906055. At the same time, the transition from the
underground cable to the standard indoor cabling can be made here.
Figure B-2 Coarse protection installed at the entry or exit of the building
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