mesh size must there-
fore not exceeded. The
building our example has building lightning protec-
tion class III.
4th step: Protection against lateral impact
From building height and the risk serious
damage (e. All the lightning protection
measures must included the roof sealing plan-
ning. However, DIN 18531-1 describes the re-
quirements and basic planning and execution prin-
ciples for sealing used and unused roofs. lightning protection class III corres-
ponds loop size m. with electrical electronic devices) is
advisable install ring circuit protect against lat-
eral impact.
Up now, roof cable holders for routing the grid have
not been part the scope application the IEC
62561-4.
Building height (h) 60m
Mesh method
The round conductors the mesh
are installed apart with roof
cable holders.g. Where the material
thickness and connections are suf-
ficient, the metal roof parapets
is used air-termination sys-
tem and mesh. The ring installed the top 20% the
building's height; the mesh size depends does
in the case roof installation the lightning pro-
tection class, e.TBS
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l Length
m Mesh width
Mesh width flat roof
Lightning protection class Mesh width
I m
II m
III m
IV m
Table 2.21: Mesh width for different lightning protection
classes
3rd step: Installing the mesh
A number different grid sizes apply, depending on
the lightning protection class the building.
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91
Chapter The external lightning protection system
. If, our example, the overall
length greater than the cable lengths specified in
Chapter (grid method), expansion piece must
also integrated for temperature-controlled length
changes. According
to this, lightning protection components may not im-
pair the sealing the roof.g
