g.
Material Expansion piece spacing m
Steel 15
Stainless steel 10
Copper 10
Aluminium 10
Table 2. summer, the length of
the air-termination systems and down-conductors
changes.1. S
shape), because they are flexible lines.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. These temperature-related changes length
must taken into account during installation.4 have proved effective.5 above the air-termination system
Table 2. For practic-
al purposes, the expansion piece spacings listed in
Table 2.g.5.
TBS
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67
Chapter The external lightning protection system
. Ex-
pansion pieces must allow flexible response to
changes length, either through their shape (e.TBS
Blitzschutz-Leitfaden
2018
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2020/01/10
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14:42:40
(LLExport_02613)
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2020/01/10
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14:42:54
2.1.5: Incorporation roof structures
Smoke and heat extraction roof
light domes must protected
from direct lightning strikes.2 Changes length due temperature
At higher temperatures, e.0 total area
2. Surge
protection devices protect the
electrical drives these devices
from damage due inductive
coupling.
Roof structures Dimensions
Metal
0.3 above roof level
1.0 length the structure
Non-metal 0.4: Expansion pieces compensate changes in
length due temperature
2
