Siemens SIMATIC ET 200iSP Operating Instructions Manual page 445

Schematic of lightning protection zones
The following figure shows in schematic form the implementation of the lightning protection
zone concept for a plant with external lightning protection. The lightning protection zone 0
shown in the figure is divided into lightning protection zone 0
definitions.
Figure A-11 Lightning protection zones of a plant with external lightning protection
Principle of interfaces between lightning protection zones
At the interfaces between the lightning protection zones, measures must be taken which have
a reducing effect on the surge current load and on the magnetic fields.
Each zone-penetrating metallic/electrical system must be included in the equipotential bonding
located at the zone transition.
Note
Metal systems include ducts, structural members, pipes (e.g., water, gas, and heat), etc.
Electrical systems include power and information technology cables and lines (e.g. mains
voltage, bus line).
ET 200iSP
Operating Instructions, 11/2022, A5E00247483-AK
A.5 Lightning and overvoltage protection
and 0 according to the following
A B
Appendix
445