Siemens S7-400 installation manual Effects of a Lightning Strike, Surges

Assembling and Installing Systems

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

Lightning protection zone 0

Lightning protection zone 1

Lightning protection zone 2

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.

Automation System S7-400	Hardware and Installation	A-21
A5E00850741-01