g.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. Surge
protection devices protect the
electrical drives these devices
from damage due inductive
coupling.4 have proved effective.
Roof structures Dimensions
Metal
0.5: Incorporation roof structures
Smoke and heat extraction roof
light domes must protected
from direct lightning strikes. These temperature-related changes length
must taken into account during installation. S
shape), because they are flexible lines.TBS
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2.2 Changes length due temperature
At higher temperatures, e. For practic-
al purposes, the expansion piece spacings listed in
Table 2. Ex-
pansion pieces must allow flexible response to
changes length, either through their shape (e.
Material Expansion piece spacing m
Steel 15
Stainless steel 10
Copper 10
Aluminium 10
Table 2.5.0 total area
2.
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67
Chapter The external lightning protection system
.4: Expansion pieces compensate changes in
length due temperature
2.g.3 above roof level
1.0 length the structure
Non-metal 0. summer, the length of
the air-termination systems and down-conductors
changes.1.5 above the air-termination system
Table 2.1
