Ex-
pansion pieces must allow flexible response to
changes length, either through their shape (e.
Roof structures Dimensions
Metal
0.2 Changes length due temperature
At higher temperatures, e.0 length the structure
Non-metal 0. 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 2.4 have proved effective.g.TBS
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2.g. These temperature-related changes length
must taken into account during installation.3 above roof level
1.5. For practic-
al purposes, the expansion piece spacings listed in
Table 2.0 total area
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 2.1.5: Incorporation roof structures
Smoke and heat extraction roof
light domes must protected
from direct lightning strikes.1. S
shape), because they are flexible lines.4: Expansion pieces compensate changes in
length due temperature
2.
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67
Chapter The external lightning protection system
. Surge
protection devices protect the
electrical drives these devices
from damage due inductive
coupling.5 above the air-termination system
Table 2
