5.
TBS
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67
Chapter The external lightning protection system
.
Roof structures Dimensions
Metal
0. summer, the length of
the air-termination systems and down-conductors
changes. Surge
protection devices protect the
electrical drives these devices
from damage due inductive
coupling.TBS
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2. These temperature-related changes length
must taken into account during installation. S
shape), because they are flexible lines.4 have proved effective.5: Incorporation roof structures
Smoke and heat extraction roof
light domes must protected
from direct lightning strikes.2 Changes length due temperature
At higher temperatures, e.g.3 above roof level
1.0 length the structure
Non-metal 0.4: 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. Ex-
pansion pieces must allow flexible response to
changes length, either through their shape (e.g.1.5 above the air-termination system
Table 2.
Material Expansion piece spacing m
Steel 15
Stainless steel 10
Copper 10
Aluminium 10
Table 2.1. For practic-
al purposes, the expansion piece spacings listed in
Table 2.0 total area
2
