Siemens Automation System S7-400 - Manual (Page 189)

Assembling and Installing Systems
A-21
Automation System S7-400 Hardware and Installation
A5E00850741-01
A.9.1 Lightning Protection Zone Concept
Principle of the Lightning Protection Zone Concept According to IEC 61312-1/DIN
VDE 0185 T103
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-6).
The individual lightning protection zones are constituted by the following measures:
The external lightning protection of the building (field side) Lightning protection
zone 0
The shielding of buildings Lightning protection
zone 1
The shielding of rooms Lightning protection
zone 2
The shielding of 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.