OBO Bettermann
24 | EN
Planning an installation
Basic
Professional
Professional plus
Premium
LPS − lightning protec-
tion class*
Max. lightning current
peak value
Number of conductors 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
2
8.52
14.20 m
17.05
3 and more
12.78
21.31 m
25.57
II
150 kA
1
7.50
12.50 m
15.00
2
11.36
18.94 m
22.73
3 and more
17.05
28.41 m
34.09
III + IV
100 kA
1
11.25
18.75 m
22.50
2
17.05
28.41 m
34.09
3 and more
25.57
42.61 m
51.14
Table 9:
Maximum length of the isCon
®
conductors in air
*
LPS lightning protection classes according to DIN EN 62305 / DIN VDE 0185-305 / IEC
62305
Note!
The values in the table apply to all type B earthers and for type A earth-
ers, 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, Table 12).
Installation for lightning protection class II
As the isCon
®
Pro, isConv Pro Plus and isCon
®
Basic systems have a
tested arresting capacity of 150 kA lightning surge current (10/350 μs),
a lightning protection system of lightning protection class II can run the
lightning current safely from the air-termination system to another arrest-
ing system with a single isCon
®
conductor (depending on the required
cable length, see Table 9).
Figure 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 cable length, see Table 9).
