Siemens SIMATIC S7-300 Hardware And Installation Manual page 221

12.3.1.1 Lightning protection zone concept
Principally of the Lightning protection zone concept to
IEC 61312-1/DIN VDE 0185 T103
The principle of the lightning protection zone concept states that the volume to be
protected against overvoltage, for example, a manufacturing hall, is subdivided into
lightning protection zones in accordance with EMC directives (see Figure ).
The specific lightning protection zones are formed by the following measures:
Lightning protection of the building exterior (field side)
Shielding
•
Buildings
•
Rooms and/or
•
Devices
Effects of the Lightning Strike
Direct lightning strikes occur in lightning protection zone 0. Lightning strike
generates high-energy electromagnetic fields which can be reduced or eliminated
from one lightning protection zone to the next by suitable lightning protection
elements/measures.
Overvoltage
In lightning protection zones 1 and higher, a lightning strike might additionally
cause overvoltage as a result of switching operations, coupling etc.
Block diagram of the lightning protection zones
The figure below shows a block diagram of the lightning protection zone concept
for a detached building.
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02
Appendix
Lightning
protection zone 0
Lightning protection
zone 1
Lightning protection
zone 2
Lightning protection
zone 3
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