47
20 2.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.42 0.01 0.01
3 0.13 0.21
15 1.10 0.02
4 0.64 0.1: Penetration depth (p) according the lightning protection class according IEC 62305
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Chapter The external lightning protection system
.07 0.46 0.03 0.84
Table 2.03 0.04 0. For brief overview see
Table 2.28 0.02 0.63 0.05
10 0.07 0.16 0.72 1.04 0.06 0.10 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 0.04
5 0.96 0.68 1
