Assembling and Installing Systems
A-15
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
A.5.1 Lightning Protection Zone Concept
Principle of the Lightning Protection Zone Concept
The principle of the lightning protection zone concept states that the volume to be
protected, for example, a manufacturing hall, is subdivided into lightning protection
zones in accordance with EMC guidelines (see Figure A-4).
The individual lightning protection zones are constituted by:
The external lightning protection of the building (field side) Lightning protection
zone 0
The shielding of
Buildings Lightning protection
zone 1
Rooms and/or Lightning protection
zone 2
Devices Lightning protection
zone 3
Effects of a Lightning Strike
Direct lightning strikes occur in lightning protection zone 0. The lightning strike
creates high-energy electromagnetic fields which can be reduced or removed from
one lightning protection zone to the next by suitable lightning protection
elements/measures.
Surges
In lightning protection zones 1 and higher, surges can result from switching
operations and interference.
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