10 0.07 0.04 0.21
15 1.03 0.01 0.72 1. For brief overview see
Table 2.64 0.63 0.16 0.03 0.47
20 2.04 0.07 0.13 0.04
5 0.1: Penetration depth (p) according the lightning protection class according IEC 62305
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Chapter The external lightning protection system
.28 0.84
Table 2.02 0.46 0.Protecting roof structures using multiple air-termin-
ation rods
If you use several air-termination rods protect an
object, you must take into consideration the penetra-
tion depth between them.10 0.06 0.1, calculate the penetration depth use
the following formula:
Formula for calculating the penetration depth
Penetration depth
Radius rolling sphere
Distance Air-termination sys-
tem
Penetration (p) the rolling sphere between the air-termination rods
Distance air-
termination
system (d) m
Penetration depth, light-
ning protection class I,
rolling sphere: m
Penetration depth, light-
ning protection class II,
rolling sphere: m
Penetration depth, light-
ning protection class III,
rolling sphere: m
Penetration depth, light-
ning protection class IV,
rolling sphere: m
2 0.68 1.42 0.05
10 0.96 0.02
4 0.01
3 0
