Siemens SIMATIC NET PROFIBUS - Manual (Page 259)

Lightning and Surge Voltage Protection for LAN Cables Between Buildings
B-5
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
B.2.1 Instructions for Installing Coarse Protection
The coarse protection must be installed at the point where the LAN cable enters
the building and connected to the building equipotential bonding system with low
impedance.
The following are required to create the coarse protection:
S
The base section type no. 919506,
S
The protection module type B, type no. 919510
and
S The shield contact terminals type no. 919508
To avoid EMC and environmental conditions affecting the coarse protection, it
should be installed in a
S
protective casing, 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