1. According to DIN 18014, is a ring earth electrode or a foundation earth electrode required?
Foundation earth electrode:
For all new buildings since a foundation earth electrode is required by DIN 18015, the latest technical connection conditions of the utility and the future connection rules AR4100.
Ring earth electrode:
When the earth electrode in the foundation (foundation earth electrode) does not have sufficient contact with earth. This is usually the case with building waterproofing, i.e. foundations with increased earth contact resistance, e.g. a white tank, perimeter insulation, foam glass gravel
2. Why do the connection points on the ring earth electrode have to be wrapped with an insulating tape if V4A material is used?
Connection points in the soil are generally a weak point - with regard to corrosion and when high-quality material such as V4A is used. This is why the standard (DIN 18014) requires that these points should be wrapped with insulating tape.
3. Which mesh size has to be used for ring and foundation earth electrodes?
The maximum mesh size for both foundation and ring earth electrodes is 20 m x 20 m.
However, in combination with a lightning protection system, the mesh size for ring earth electrodes must be 10 m x 10 m. It is advisable to use a mesh size of 10 x 10 m for ring earth electrodes to ensure that a lightning protection system can be retrofitted.
4. Is a ring earth electrode always required in combination with a lightning protection system?
No. According to DIN 18014, the earth-termination system for a lightning protection system can either be a ring earth electrode or a foundation earth electrode. The lightning protection system must then be erected according to Part 3 of the EN 62305 lightning protection standard.
5. What are the distances from the ring earth electrode and foundation earth electrode to the edge of the building?
A gap of at least 1 metre is required between the ring earth electrode and the building and the ring earth electrode should be buried at a depth of at least 0.8 m. The foundation earth electrode should be installed as a closed ring in the floor slab at the outer edge of the foundations (covered by at least 5 cm of concrete).
6. What about buildings with individual foundations?
Individual foundations require an earth electrode with a length of at least 2.5 m. The individual foundations must be interconnected using corrosion-resistant earthing materials V4A - preferably in direct contact with earth. If waterproof concrete is used in the individual foundations, a ring earth electrode must be installed.
7. Is it always necessary to mount earth rods?
No, earth rods are not required for the standard configuration of foundation or ring earth electrodes. Earth rods should be used as an alternative if it is not possible to install an earth-termination system which complies with DIN 18014.
In this case, earth rods with a length of at least 3 m can be installed around the building as an additional measure to the ring earth electrode. They are preferably installed at the corners of the building. The distance between the earth rods may not exceed 20 m if there is no lightning protection system and 10 m with if there is a lightning protection system. The earth rods must be connected to the ring earth electrode.
8. Why is a functional bonding conductor and a ring earth electrode required?
According to DIN 18014, a functional bonding conductor is required in the concrete foundation in addition to a ring earth electrode since the internal equipotential bonding of the building structure (reinforcements, metal structures, etc.) is established here. The functional bonding conductor should be connected to the reinforcement every 2 m and to the ring earth electrode every 20 m (if a lightning protection system is required, every 10 m).
9. The customer has a mixture, e.g. white tank + individual foundations + floor slab (for example, a warehouse: partly concrete floor slab, partly paved).
How can one comply with the standard here?