rooftop antennas), the lightning
energy can safely discharged earth potential.
If lightning strike hits the external
lightning protection system or
earthed roof structures capable of
carrying lightning current, the light-
ning energy can safely dis-
charged earth potential. This potential in-
crease causes transmission the lightning current
over the building's earthing system and also over the
power supply systems and data cables the adja-
cent earthing systems (adjacent building, low-voltage
transformer).
But lightning protection system alone not enough:
due its impedance, the building's entire earthing
system raised high potential. direct lightning strike poses risk of
loss human life, public services (telephone), cultural
treasures (museums, theatres) and economic goods
(property).g.
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2018
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17
Chapter General introduction
. The lightning protection system protects
the building and people from direct lightning impulses
and fires.TBS
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2018
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Danger: direct lightning strike
S1: Direct lightning strike into building
If lightning strike hits the external lightning protection
system earthed roof structures capable carrying
lightning current (e
