5 for vertical earth electrodes.
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). This
could cause unapproved arcing lethal voltage dif-
ferences.
Connection cables should short possible
and not installed higher than above the ground. The minimum
length each earth rod for horizontal earth elec-
trodes and 0.TBS
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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.
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
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2020/01/10
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153
Chapter The external lightning protection system
. If
the lightning protection equipotential bonding was
only connected single earth electrode, then high
potential difference other earthers would result
