Brochure/Catalogue

Lightning protection levels
The lightning protection level applies only to the
pulse current 10/350 or to Type I.
Lightning protection level I
Lightning protection level I covers a pulse of 200 kA. This
is the worst-case scenario of a direct strike. This pertains to
external lightning protection facilities.
Half of this pulse is conducted to the earth and the other half
is conducted to the section of the facility that is conductive.
If only a four-wire system is available, then a current of 25 kA
is distributed to each wire. For a ve-wire system, that would
correspond to 20 kA.
This lightning protection class covers multiple areas,
including: petrochemical facilities (Ex-zones) and explosive
material depots.
Lightning protection level II
Lightning protection level II covers a pulse of 150 kA. This
pertains to external lightning protection facilities. Half of
this pulse is conducted to the earth and the other half is
conducted to that section of the facility that is conductive.
If only a four-wire system is available, then a current of 19 kA
is distributed to each wire. For a ve-wire system, that would
correspond to 15 kA.
This lightning protection class covers multiple areas,
including: parts of hospitals, shipping warehouses with re
alarm systems and telecommunication towers.
Lightning protection level III/IV
Lightning protection level III covers a pulse of 100 kA.
This pertains to external lightning protection facilities.
Half of this pulse is conducted to the earth and the other half
is conducted to that section of the facility that is conductive.
If only a four-wire system is available, then a current of
12.5 kA is distributed to each wire. For a ve-wire system,
that calculates to 10 kA. The 12.5 kA value is also used
here. About 80% of all applications are covered by
lightning protection class III. This includes houses, homes,
administrative buildings, industrial facilities and so on.
Schutzklasse
I
II
II
I/IV
200 kA
100 kA
PAS
100 kA
150 kA
75 kA
PAS
75 kA
100 kA
50 kA
PAS
50 kA
Lightning protection levels (LPL)
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The basics of lightning and surge protection
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