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. mesh size must there-
fore not exceeded. Where the material
thickness and connections are suf-
ficient, the metal roof parapets
is used air-termination sys-
tem and mesh.
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91
Chapter The external lightning protection system
. The
building our example has building lightning protec-
tion class III. However, DIN 18531-1 describes the re-
quirements and basic planning and execution prin-
ciples for sealing used and unused roofs.g.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. All the lightning protection
measures must included the roof sealing plan-
ning. with electrical electronic devices) is
advisable install ring circuit protect against lat-
eral impact.g. 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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2018
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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. According
to this, lightning protection components may not im-
pair the sealing the roof.
Building height (h) 60m
Mesh method
The round conductors the mesh
are installed apart with roof
cable holders.
Up now, roof cable holders for routing the grid have
not been part the scope application the IEC
62561-4. lightning protection class III corres-
ponds loop size m.
4th step: Protection against lateral impact
From building height and the risk serious
damage (e
