Lightning Protection Zone Concept - Siemens S7-400 Installation Manual

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)
The shielding of buildings
The shielding of rooms
The shielding of devices
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.
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
Assembling and Installing Systems
Lightning protection
zone 0
Lightning protection
zone 1
Lightning protection
zone 2
Lightning protection
zone 3
A-21