3
α α
III
IV
α
(°)
80
70
60
50
40
30
20
10
0
I
II
0
10 20 30 40 50 60
h (m)
The supporting tube with air-termination tip/rod fixed in a tripod can be used to install “isolated
air-terminations” according to IEC 62305-3. Moreover, HVI Conductors can be installed
inside/outside the supporting tube.
When using a supporting tube, the protective angle method must be used. The protective angle
α
depends on the class of LPS (lightning protection level) and the height of the supporting tube
above the reference plane. The relevant values can be found in Table 3 of IEC 62305-3 (see also
Fig. 1 and Table 1). As an alternative, the rolling sphere method can be used to position the sup-
porting tube.
Table 1
Calculation of the protective angle
Protective angle
α
class of LPS
Fig. 1
Protective angle
α
1. Application
Summary of Contents for 105 351
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