Transfer the protective angle the building. our example, this angle 62° with
protection class III and building height m. our example, the angle
is 62°.
Protected area
α Protective angle
a Distance furthest point protected area
h Height the building
Installing the air-termination system
Lightning protective angle α
Ridge height m
Lightning protection classes II, III, IV
Diagram assist determining the protective angle accordance with IEC 62305
2nd step: Determine the protective angle
Example:
The height the building (in this case: is
entered onto the horizontal axis the diagram (see
point axis "2" graph above). Transfer the protective angle the building.
TBS
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2020/01/10
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Chapter The external lightning protection system
. Then proceed vertic-
ally
until you meet the curve for your lightning protectio (in
this case: III). All build-
ing parts within this angle are protected.1st step: Installing the air-termination system
First, round conductor installed all primary im-
pact points such ridges, crests edges. You can now read the protective angle
(α) off the vertical axis (“1”).
All building parts within this angle are protected.
Determine the protected area follows: transfer the
height the building the diagram and read off the
protective angle
