The
number conductors derived from the scope of
the building protected, although least two
conductors are required every case. order reduce the probability damage
from the lightning current flowing through the lightning
protection system, the down-conductors should at-
tached such way that, between the impact point
and the earth:
• Multiple parallel current routes exist
• The length the down-conductors kept short
as possible
• Equipotential bonding created between the con-
ductive parts the building structure.2 Down-conductors
Down-conductors are the part the external lightning
protection system designed route the lightning cur-
rent from the air-termination system the earthing
system.Down-conductor system according IEC 62305-3
2.22
shows the distances between the conductors and the
corresponding lightning protection classes.
The conductor system routes the lightning current
from air-termination system earthing system.
Care must taken ensure that the current paths
are short and installed without loops.
TBS
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2018
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Chapter The external lightning protection system
. Table 2
