Appendix
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
11-19
11.3.2 Lightning protection zone conception
Principally of the Lightning protection zone conception to
IEC 61312-1/DIN VDE 0185 T103
The principle of the lightning protection zone conception states that the volume to
be protected against overvoltage, for example, a manufacturing hall, is subdivided
into lightning protection zones in accordance with EMC guidelines (see Figure).
The specific lightning protection zones are formed by the following measures:
Lightning protection of the building exterior (field side) Lightning protection
zone 0
Shielding
• Buildings
• Rooms and/or
• Devices
Lightning protection
zone 1
Lightning protection
zone 2
Lightning protection
zone 3
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
conception for a detached building.
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