5 above the air-termination system
Table 2. summer, the length of
the air-termination systems and down-conductors
changes.4 have proved effective.
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67
Chapter The external lightning protection system
.4: Expansion pieces compensate changes in
length due temperature
2.TBS
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2018
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2.1. These temperature-related changes length
must taken into account during installation.5: Incorporation roof structures
Smoke and heat extraction roof
light domes must protected
from direct lightning strikes.1.2 Changes length due temperature
At higher temperatures, e. Surge
protection devices protect the
electrical drives these devices
from damage due inductive
coupling.g.
Material Expansion piece spacing m
Steel 15
Stainless steel 10
Copper 10
Aluminium 10
Table 2. Ex-
pansion pieces must allow flexible response to
changes length, either through their shape (e. S
shape), because they are flexible lines.0 length the structure
Non-metal 0.3 above roof level
1.3 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 2.5.0 total area
2.
Roof structures Dimensions
Metal
0. For practic-
al purposes, the expansion piece spacings listed in
Table 2.g
