Lightning Protection Zone Concept - Siemens SIMATIC ET 200iSP Operating Instructions Manual

The rules to be observed for the transitions between the individual lightning protection zones
are shown in the process.
Note
This section can only give you advice on protecting the ET 200iSP from overvoltage.
However, complete protection against overvoltages is only guaranteed if the entire plant is built
based on the lightning protection zone concept. Extensive considerations must be made in this
regard as early as the planning phase of the plant.
If you wish to obtain comprehensive information on protection against overvoltages, we
recommend that you contact your Siemens representative or a company that specializes in
lightning and overvoltage protection.
In the following, the normative term of surge protection device is divided into overvoltage
suppressor for pulse shape 8/20 μs and lightning arrester for pulse shape 10/350 μs depending
on the expected extent of the threat (pulse shape 8/20 μs or pulse shape 10/350 μs).
Additional literature
The following information is based on the lightning protection zone concept described in the
standard IEC 62305-4 "Protection against LEMP".
A.5.2

Lightning protection zone concept

Principle of the lightning protection zone concept according to IEC 62305-4, DIN EN 62305-4, VDE
0185-4
The principle of the lightning protection zone concept states that the volume to be protected
against overvoltages, e.g. a control room, is divided into lightning protection zones from an EMC
point of view (see the figure below).
The individual lightning protection zones (LPZ: Lightning Protection Zone) delineate spatially as
follows and are not necessarily physical boundaries such as walls, floors, etc.
Table A-32
Lightning protection zones (LPZ: Lightning Protection Zone)
Exterior areas of a plant with direct risk of lightning strike
Exterior areas of a plant that are not exposed to a direct risk of
lightning strike.
Interior areas of a plant that follow lightning protection zone 0
Interior areas of a plant that is usually separate EMC-reducing areas
and are located in lightning protection zone 1.
Electrical equipment (with shielding properties) in lightning protec‐
tion zone 2
ET 200iSP
Operating Instructions, 11/2022, A5E00247483-AK
Lightning protection zones
A.5 Lightning and overvoltage protection
Lightning protection zone (LPZ) 0
Lightning protection zone (LPZ) 0
. Lightning protection zone (LPZ) 1
B
Lightning protection zone (LPZ) 2
Lightning protection zone (LPZ) 3
Appendix
A
B
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