For practic-
al purposes, the expansion piece spacings listed in
Table 2. S
shape), because they are flexible lines. summer, the length of
the air-termination systems and down-conductors
changes.4 have proved effective.g.
Material Expansion piece spacing m
Steel 15
Stainless steel 10
Copper 10
Aluminium 10
Table 2.5: Incorporation roof structures
Smoke and heat extraction roof
light domes must protected
from direct lightning strikes. Surge
protection devices protect the
electrical drives these devices
from damage due inductive
coupling.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.
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
.g.0 total area
2.1.1.
Roof structures Dimensions
Metal
0.4: Expansion pieces compensate changes in
length due temperature
2.5. These temperature-related changes length
must taken into account during installation.0 length the structure
Non-metal 0.5 above the air-termination system
Table 2.2 Changes length due temperature
At higher temperatures, e. Ex-
pansion pieces must allow flexible response to
changes length, either through their shape (e.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
2.3 above roof level
1
