0 and depth of
0.83 m
Condition r≥l1 fulfilled.2 Type ring earth electrodes
The type ring earth electrodes laid around the
building.5 mm
• Round conductors made copper, mm
• Round conductors made stainless steel, Ø
10 mm
• Round conductors made galvanised steel, Ø
10 mm
See Chapter 2.3.2 Materials for earthing systems.83 m
31.
Functional method
Outside the building, least 80% the ring earth
electrodes (surface earther's) overall length must in
contact with the ground.
Corrosion protection
In the earth, rustproof stainless steel with molyb-
denum content 2%, e.
Earth rods (optional)
Underground connection
Main earthing busbar (MEB)
Installation principle, ring earther
Materials for ring earth electrodes
The following materials can used, amongst others:
• Stainless steel flat conductors, 3.Materials for type A
The following materials can used, amongst others:
• Rods from stainless steel, mm
• Galvanised steel rods, mm
• Copper coated steel rods, mm
• Stainless steel rods, mm
• Galvanised steel flat conductors, 3.
r=√(A/π)
r≥ l1
r: Medium radius the area covered the earther
A: Area the earthing system m2
l1: Minimum earth length m
Example
Area 100 m2
, covered type earther
Lightning protection class I,
Sand, gravel, top layers (dry) 1,000 Ωm,
l1 from "Minimum lengths earthers" m
Result:
A=100 m2
r=√(100m2
/π)=31. 1.5 mm
• Galvanised steel pipes, mm
See Chapter 2.
In the earth, rustproof stainless
steel with molybdenum content
of should used.g.
Corrosion protection
In potentially corrosive areas, rust-proof stainless steel
with molybdenum content 2%, e.4.g.5 (or 0.
TBS
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Chapter The external lightning protection system
.8 according DIN 18014) around the
external foundation the building.4571, should used. Detachable connections in
the ground must protected against corrosion
(plastic corrosion protection strip).4404 or
1.5 mm
• Galvanised steel flat conductors, 3.4404 1.
Condition for additional earthing measures
With type earthing systems, the central radius r
must greater than equal the minimum earth-
ing length l1.5 mm
• Stainless steel flat conductors, 3. Detachable connections the
ground must protected against corrosion (plastic
corrosion protection strip). ring earth elec-
trode earther according arrangement type B.2 Materials for earthing systems.7.4571,
should used. 1. must installed a
closed ring distance 1.7.
2.
Normative requirements
All types earth rods and potential coupling pieces
must tested according IEC 62561-2 ED2
