Corrosion protection
In potentially corrosive areas, rust-proof stainless steel
with molybdenum content 2%, e.2 Materials for earthing systems.4571, should used. 1.5 mm
• Round conductors made copper, mm
• Round conductors made stainless steel, Ø
10 mm
• Round conductors made galvanised steel, Ø
10 mm
See Chapter 2.4404 1.
Functional method
Outside the building, least 80% the ring earth
electrodes (surface earther's) overall length must in
contact with the ground.4.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, 3.0 and depth of
0.5 mm
• Galvanised steel pipes, mm
See Chapter 2.8 according DIN 18014) around the
external foundation the building.
Corrosion protection
In the earth, rustproof stainless steel with molyb-
denum content 2%, e. ring earth elec-
trode earther according arrangement type B. 1.2 Materials for earthing systems. must installed a
closed ring distance 1.7.5 mm
• Galvanised steel flat conductors, 3. Detachable connections the
ground must protected against corrosion (plastic
corrosion protection strip).
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Chapter The external lightning protection system
.
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, 3.83 m
31.
Condition for additional earthing measures
With type earthing systems, the central radius r
must greater than equal the minimum earth-
ing length l1.g.
In the earth, rustproof stainless
steel with molybdenum content
of should used. Detachable connections in
the ground must protected against corrosion
(plastic corrosion protection strip).83 m
Condition r≥l1 fulfilled.
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)=31.4404 or
1.
Normative requirements
All types earth rods and potential coupling pieces
must tested according IEC 62561-2 ED2.3.2 Type ring earth electrodes
The type ring earth electrodes laid around the
building.7.4571,
should used.5 mm
• Stainless steel flat conductors, 3.g.5 (or 0.
2
