A type earthing system suitable for low building
structures (e.g.5 for vertical routing and for hori-
zontal routing apply for type earthers for lightning
protection classes III and IV.
• Often, the specific ground resistance cannot de-
termined the densely built-up areas.
The required earther lengths may
be split into several lengths con-
nected parallel. single-occupancy dwellings), existing
building structures, for LPS with air-termination rods or
tension cables, for isolated LPS.
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Chapter The external lightning protection system
.
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.
As minimum dimension (according IEC 62305-3),
a length 2.4. Depending the soil
conditions, earth rods can driven into the earth by
hand using suitable electric, petrol pneumatic
hammers. Type earthing
systems comprise horizontal and vertical earth elec-
trodes, connected each conductor.2.
All earth rods must connected with ring earther
inside outside the building and with entry to
the equipotential busbar. This
should routed distance 1.3.0 in
length recommended for each conductor.
• Down-conductors are interconnected near the sur-
face the ground.1 Type earth rod structure
Functional method
As single earth electrodes, earth rod 9. these
cases, when determining the minimum length the
earther, sufficient assume specific ground
resistance 1,000 Ohm/m.5 below the
surface the earth under the frost limit.
• Earther arrangement, type connection inside and
outside the building structure.
Information arrangement type earthers
• general, earth rods are inserted vertically into the
earth fairly large depths. 0.
• type earthing systems, there minimum re-
quirement two earth rods.0 from the
foundation the building and min
