4: Expansion pieces compensate changes in
length due temperature
2.1.TBS
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2.2 Changes length due temperature
At higher temperatures, e.
TBS
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67
Chapter The external lightning protection system
.5: Incorporation roof structures
Smoke and heat extraction roof
light domes must protected
from direct lightning strikes.1. summer, the length of
the air-termination systems and down-conductors
changes.g.5.g.4 have proved effective.0 length the structure
Non-metal 0.5 above the air-termination system
Table 2. Ex-
pansion pieces must allow flexible response to
changes length, either through their shape (e.3 above roof level
1. Surge
protection devices protect the
electrical drives these devices
from damage due inductive
coupling.0 total area
2. S
shape), because they are flexible lines.
Material Expansion piece spacing m
Steel 15
Stainless steel 10
Copper 10
Aluminium 10
Table 2.
Roof structures Dimensions
Metal
0.3 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. For practic-
al purposes, the expansion piece spacings listed in
Table 2. These temperature-related changes length
must taken into account during installation
