0 length the structure
Non-metal 0.g.4 have proved effective.4: Expansion pieces compensate changes in
length due temperature
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.
Roof structures Dimensions
Metal
0. S
shape), because they are flexible lines.5 above the air-termination system
Table 2.5. Ex-
pansion pieces must allow flexible response to
changes length, either through their shape (e. For practic-
al purposes, the expansion piece spacings listed in
Table 2.1.
Material Expansion piece spacing m
Steel 15
Stainless steel 10
Copper 10
Aluminium 10
Table 2. These temperature-related changes length
must taken into account during installation.
TBS
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Chapter The external lightning protection system
. summer, the length of
the air-termination systems and down-conductors
changes.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.g.2 Changes length due temperature
At higher temperatures, e.0 total area
2.3 above roof level
1.1.TBS
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