5: Incorporation roof structures
Smoke and heat extraction roof
light domes must protected
from direct lightning strikes. Ex-
pansion pieces must allow flexible response to
changes length, either through their shape (e.
Material Expansion piece spacing m
Steel 15
Stainless steel 10
Copper 10
Aluminium 10
Table 2.2 Changes length due temperature
At higher temperatures, e.g. Surge
protection devices protect the
electrical drives these devices
from damage due inductive
coupling.0 length the structure
Non-metal 0.g.5.TBS
Blitzschutz-Leitfaden
2018
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en
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2020/01/10
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2.1.
Roof structures Dimensions
Metal
0.0 total area
2.4 have proved effective.3 External lightning protection for roof struc-
tures
Roof structures must incorporated into the external
lightning protection system according IEC 62305-3
if they exceed the dimensions stated Table 2. For practic-
al purposes, the expansion piece spacings listed in
Table 2.1. summer, the length of
the air-termination systems and down-conductors
changes.4: Expansion pieces compensate changes in
length due temperature
2.
TBS
Blitzschutz-Leitfaden
2018
/
en
/
2020/01/10
14:42:40
14:42:40
(LLExport_02613)
/
2020/01/10
14:42:54
14:42:54
67
Chapter The external lightning protection system
. S
shape), because they are flexible lines.5 above the air-termination system
Table 2.3 above roof level
1. These temperature-related changes length
must taken into account during installation
