Siemens SIMATIC ET 200iS Manual page 91

Note
This section can only provide you with the general guide on protecting the ET
200iS from overvoltage.
Complete protection from overvoltage is only guaranteed when the entire system is
designed to protect from overvoltage. This relates particularly to building structures
included in the planning of the building.
We therefore recommend that you contact your Siemens representative or a
company specialized in lightning protection if you require more detailed information
about overvoltage.
Further Sources
The solutions explained in these manuals are based on the lightning protection
zone concept described in the standard IEC IEC 61312-1 - "Protection against
LEMP".
6.4.2 The Lightning Protection Zone Concept
Principal of the Lightning Protection Zone Concept complying with IEC 61312-
1/DIN VDE 0185 T103
The principle of a lightning protection zone requires that facilities to be protected
from overvoltages, for example a control room, should be divided into lightning
protection zones based on EMC considerations (see figure below).
The individual lightning protection zones are formed as follows:
Table 6-6
the external lightning protection of the
building
peripheral parts of the system in which no
galvanic coupling of lightning stroke current
can occur (field side)
the shielding of
•
buildings
•
rooms and/or
•
Devices
ET 200iS Distributed I/O Station
A5E00087831-02
Lightning Protection Zones
Lightning Protection Zones
Lightning protection zone 0
Lightning protection zone 0
Lightning protection zones 1
Lightning protection zones 2
Lightning protection zones 3
Wiring
A
B
6-7