summer, the length of
the air-termination systems and down-conductors
changes.
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. S
shape), because they are flexible lines.1.5.0 total area
2.1.
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Chapter The external lightning protection system
.4: Expansion pieces compensate changes in
length due temperature
2. 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.
Roof structures Dimensions
Metal
0.g.3 above roof level
1.4 have proved effective. Surge
protection devices protect the
electrical drives these devices
from damage due inductive
coupling.TBS
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2.3 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. Ex-
pansion pieces must allow flexible response to
changes length, either through their shape (e.5 above the air-termination system
Table 2.0 length the structure
Non-metal 0. For practic-
al purposes, the expansion piece spacings listed in
Table 2
