Siemens SIMATIC ET 200iSP

E󹪜ect of the lightning strike
Direct lightning strikes occur in lightning protection zone 0
A
. E󹪜ects of the lightning strike are
high-energy lightning currents and strong electromagnetic 󹪝elds. As direct lightning strikes only
occur in lightning protection zone 0
A
(as described in the next section), they are not considered.
Only lightning protection zone transitions from 0
B
to 1 and higher are considered.
E󹪜ects are to be reduced from one lightning protection zone to the next lightning protection
zone by means of suitable lightning current or combined lightning current arresters or shielding
measures.
As described in EN 1127-1, direct lightning strikes ignite potentially explosive atmospheres.
Permanently e󹪜ective lightning protection systems are therefore mandatory for such
installations according to current lightning protection standards.
Overvoltages
Electromagnetic 󹪝elds of the lightning channel can be reduced with appropriate shielding
measures. Overvoltages caused by inductions can be reduced to a harmless level from lightning
protection zone 0
B
by means of overvoltage suppressors.
Appendix
A.5 Lightning and overvoltage protection
ET 200iSP
444 Operating Instructions, 11/2022, A5E00247483-AK