Risk level (LPL light-
ning protection level)
Radius rolling sphere Smallest peak current value Max. However,
the probability lateral impact negligible on
building structures with height less than m. peak current value kA
I 200
II 150
III 150
IV 100
Radius rolling sphere for different lightning protection classes
Modern CAD programs can reproduce the
rolling sphere rolling over the entire installation that is
to protected. For example, buildings lightning
protection class the ball touches surfaces and
points that buildings lightning protection class II
(or III IV) would still the protected area.
Note
Lateral impacts can occur any building structures
higher than the radius the rolling sphere. The
rolling sphere method allows the installation di-
vided into different external lightning protection zones
(LPZs) "lightning protection levels" (LPLs):
LPZ 0A
Hazards from direct lightning strikes and the entire
electromagnetic field the lightning.
LPZ 0B
Protected against direct lightning strikes, but risk
from the entire electric field the lightning.
Rolling sphere method and the resulting lightning protec-
tion zones (LPZs)
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Chapter The external lightning protection system
