The required earther lengths may
be split into several lengths con-
nected parallel.
As minimum dimension (according IEC 62305-3),
a length 2.
A type earthing system suitable for low building
structures (e.
• type earthing systems, there minimum re-
quirement two earth rods.
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
152
Chapter The external lightning protection system
.
• Often, the specific ground resistance cannot de-
termined the densely built-up areas. Type earthing
systems comprise horizontal and vertical earth elec-
trodes, connected each conductor.g.
Information arrangement type earthers
• general, earth rods are inserted vertically into the
earth fairly large depths.5 below the
surface the earth under the frost limit.
All earth rods must connected with ring earther
inside outside the building and with entry to
the equipotential busbar. 0. Depending the soil
conditions, earth rods can driven into the earth by
hand using suitable electric, petrol pneumatic
hammers.
Earth rod, type A
Underground connection
Main earthing rail (MER)
Earthing system, type Connection outside the building
structure
The type fan earth rods not fulfil the require-
ments for equipotential bonding and potential control. They are driven into nat-
ural soil, which usually only found beneath found-
ations.0 from the
foundation the building and min.0 in
length recommended for each conductor.5 for vertical routing and for hori-
zontal routing apply for type earthers for lightning
protection classes III and IV.4.
• Earther arrangement, type connection inside and
outside the building structure. single-occupancy dwellings), existing
building structures, for LPS with air-termination rods or
tension cables, for isolated LPS. these
cases, when determining the minimum length the
earther, sufficient assume specific ground
resistance 1,000 Ohm/m.1 Type earth rod structure
Functional method
As single earth electrodes, earth rod 9.
• Down-conductors are interconnected near the sur-
face the ground. This
should routed distance 1.3.2
