OBO Bettermann
24 | EN
Planning an installation
Basic
Pro
Pro+
Premium
LPS − lightning protec-
tion class*
Max. lightning current
peak value
Number of conduc-
tors
Length for s ≤
0.45 m in air
Length for s ≤
0.75 m in air
Length for s ≤
0.90 m in air
I
200 kA
1
-
–
11.25 m
2
8.52 m
14.20 m
17.05 m
3 and more
12.78 m
21.31 m
25.57 m
II
150 kA
1
7.50 m
12.50 m
15.00 m
2
11.36 m
18.94 m
22.73 m
3 and more
17.05 m
28.41 m
34.09 m
III + IV
100 kA
1
11.25 m
18.75 m
22.50 m
2
17.05 m
28.41 m
34.09 m
3 and more
25.57 m
42.61 m
51.14 m
Tab 9:
Maximum length of the isCon
®
conductors in air
*
LPS lightning protection classes according to DIN EN 62305 / VDE 0185-305 / IEC 62305
Note!
The values in the table apply to all type B earthers and for type A
earthers, in which the earth resistance of the neighbouring earthing
electrodes differs by less than a factor of 2. If the earther resistance of
individual electrodes deviates by more than a factor of 2, k
c
= 1 should be
assumed (Source: DIN EN 62305-3:2011, Tab. 12).
Installation for lightning protection class II
As the isCon Pro, isCon Pro+ and isCon Basic systems have a tested
arresting capacity of 150 kA lightning surge current (10/350 μs), a light-
ning protection system of lightning protection class II can run the lightning
current safely from the air-termination system to another arresting system
with a single isCon
®
conductor (depending on the required conductor
length, see Tab. 9).
Fig 14:
One isCon
®
conductor for lightning protection class II/I
Installation for lightning protection class I
In a lightning protection system of lightning protection class I, one isCon
®
Premium conductor can be used from the air-termination unit up to the
arresting system to implement the separation spacing (depending on the
required conductor length, see Tab. 9).
