Potential equalization? Ring earth or foundation earth...

The mesh size of the functional equipotential bonding conductor is now also precisely defined – for larger areas to be spanned, a mesh size of 10 x 10 meters is recommended.

It is quite unusual for the author to make a lapse, but this statement does not comply with the standard.

The mesh size was immediately changed to the standard-compliant 20 x 20 meters following the correction note.

Hello everyone, I have quite a few questions regarding grounding/potential equalization.

We are currently building our own home and I am personally responsible for the electrical work and potential equalization. I have already laid the grounding under the floor slab, which is scheduled to be poured later this week.
Now some basic data about the basement: The basement will be sealed with 3 layers of disc layer coating with fabric, so a black tank, and the floor slab is waterproof concrete (WU).
The basement walls will be precast concrete elements in sandwich construction and will be poured on site.
How and where do I best connect the grounding with the potential equalization? I would like to connect all 4 corners of the house as a safety measure in case lightning protection is installed later.
However, we do not want a visible grounding connection tab at every corner of the building since it is a residential basement.

My idea is: Grounding fixed points in the floor slab and connect potential equalization with grounding there.
I was thinking about doing something in the sandwich walls, but that seems too complicated and fiddly, I think.
Can someone tell me if the grounding fixed points on the side of the floor slab are okay or does anyone have another idea?

Why don't you do an earthing flag in the utility room as usual and that's it?

Yes, I will make one in the utility room. However, it must be connected in a ring conductor with equipotential bonding because I have a WU floor slab. The equipotential bonding in the floor slab due to the WU is not earth-conductive, meaning no proper connection to the earth, so a second closed ring must be laid outside the floor slab. I just don't have a conclusive concept for connecting the two except via earth fixing points in the floor slab.

Hello everyone, I have quite a few questions about grounding/potential equalization.

We are currently building our own home, and I am responsible for the electrical work and potential equalization myself. I have already installed the grounding under the floor slab, and the floor slab is supposed to be poured this week.

Although DIN 18014 is often violated, its wording is clear: For new buildings, the installation of grounding systems and the required measurement documentation according to NAV § 13 are reserved for electrical professionals licensed by a VNB.

Once an electrician, always an electrician, is no longer true. Given the need for questions, it is obvious that the required minimum qualification is lacking, and probably also the measuring equipment to measure grounding and transition resistances.

How and where do I best connect the grounding to the potential equalization? I would like to connect all 4 corners of the house as a safety measure for later if lightning protection should be installed.
However, we do not want to have a visible connection tag from the grounding in every building corner, as it is a residential basement.

DIN 18014 for foundation/ring grounding and the lightning protection standards series DIN EN 62305 (VDE 0185-305) set minimum requirements and do not provide any allowance for aesthetic sensitivities:

[*]Ring grounding made of stainless steel, material number 1.4571 or equivalent (V4A); steel/galvanized is no longer permitted since 2007
[*]Mesh size of the ring grounding maximum 20 x 20 m, with lightning protection system maximum 10 x 10 m
[*]With full perimeter insulation or closed containment, a potential equalization conductor made of 10 mm round wire or strip iron 30 x 3.5 mm in steel/galvanized or black with at least 5 cm concrete cover must be installed in addition to the ring grounding, and like this, fastened or welded to the reinforcement every 2 m
[*]The ring grounding must be connected at every connection tag or at least every 20 m of building perimeter with this PE conductor
[*]Connection tags for a lightning protection system or as grounding connection for roof antennas or photovoltaic systems can also be embedded in concrete basement walls in an optically compatible manner
[*]With lightning protection system or grounding-required roof antenna, the connectors and if applicable the main grounding bar must be certified according to the test standard as capable of withstanding lightning current.

[*]From 3 down conductors, a certificate for class N = 50 kA is sufficient; for the connectors of grounding conductors (including the main grounding bar) for a grounding-required roof antenna, class H = 100 kA is required

[*]All work on lightning protection systems must be reserved for lightning protection specialists certified by VDE or VdB

Grounding conductors of antennas are not less hazardous than down conductors of lightning protection systems and should be laid preferably outside and not inside as lightning rods, avoiding dangerous proximities.

Why don’t you just, as usual, make a grounding flag in the utility room and that’s it?

It’s not that simple according to DIN 18014 or IEC 62305.