Connection cables should short possible
and not installed higher than above the ground.5 for vertical earth electrodes.
Lightning protection class I
Lightning protection class II
Lightning protection class III IV
Minimum earth rod length l1
(m)
Specific earth resistance p(Ωm)
Example
• Lightning protection class I
• Sand, gravel, top layers (dry) 1,000 Ωm
Result
• Lightning protection class m
• Earth rod: m
Minimum lengths earthers
TBS
Blitzschutz-Leitfaden
2018
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en
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2020/01/10
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153
Chapter The external lightning protection system
.
The minimum length each earth electrode based
on the protection class the LPS not relevant if
the earthing resistance the individual earth elec-
trode (recommendation).TBS
Blitzschutz-Leitfaden
2018
/
en
/
2020/01/10
14:42:40
14:42:40
(LLExport_02613)
/
2020/01/10
14:42:54
14:42:54
Earth rod, type A
Underground connection
Surface-mounted connection
Connection inside the building
Main earthing rail (MER)
Earthing system, type Connection inside and outside
the structure
If not possible connect the earth rods the
ground, this can take place the building. The minimum
length each earth rod for horizontal earth elec-
trodes and 0. This
could cause unapproved arcing lethal voltage dif-
ferences. If
the lightning protection equipotential bonding was
only connected single earth electrode, then high
potential difference other earthers would result
