the natural down-con-
ductor also optimised protection against
LEMP (lightning electromagnetic impulse), corres-
ponding grids within the system should realised. This requires exact coordination.
Measurement
The total electrical resistance should measured us-
ing testing unit suitable for this purpose (DC source,
10 measuring current).
Here grid widths and are recom-
mended. The down-conductors must be
routed sections. this case, recommend the erection of
an external conductor. The down-conductors must also be
additionally connected the reinforcement.
The connection points must created carefully with
clamp connectors. these values are not achieved,
then the steel reinforcement may not used a
conductor. A
connection the earthing system capable with-
standing lightning current must also executed, at
least the main earthing rail.
Reinforced concrete elements are ideally suited a
down-conductors system, provided that this use in-
cluded the planning process good time.
Continuous reinforcement the building structure
If the reinforcement reinforced concrete the build-
ing structure being used natural down- con-
ductor, must joined the air termination system
using lightning protection connection components in
accordance with IEC 62561-1 (DIN 62561-1).
TBS
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113
Chapter The external lightning protection system
.
Two types measurement must carried out:
• The resistance the connection point the rein-
forcement the next connection point should <
10 mΩ
• The connection point the reinforcement with the
main earthing rail should not exceed per
metre building height.TBS
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Example: use reinforced concrete supports/ down-
conductor system
Down-conductor grid width m
Reinforcement mesh width m
Example: use reinforced concrete supports/ down-
conductor system
In building structures with reinforced concrete sup-
ports walls, the down-conductors must routed in
the reinforcement. Earthing
fixed points should used connection points for
down-conductors and the equipotential bonding. building structures made of
prefabricated concrete sections, the electrical continu-
ity the steel reinforcement the individual prefab-
ricated concrete sections with the neighbouring pre-
fabricated concrete sections must guaranteed.
Tests should ideally carried out before and after
filling with concrete. Exact
specifications are required for the manufacture the
reinforced concrete elements.
With systems made prefabricated concrete and pre-
stressed concrete sections, the electrical continuity
must checked with continuity test between the
top section and the earth. Production must be
checked and documented photographs
