Foundation earth electrode (frost skirt) executed incorrectly

Hi,

we are building a small single-family house. Strip foundations (frost skirt?) and base slab are partially or fully insulated (see attachment). The shell construction work was completely outsourced to a construction company (roof excluded).
Information about the structure:
Under the strip foundations, a type of leveling layer (somewhat wider than the foundations, interior is free) made of concrete was placed on the soil. The strip foundations were then placed on top. These were partially insulated on the outside (according to structural analysis, concrete C25/30 XC2). Under the base slab, a gravel-sand mixture was laid and compacted. On top of that came a layer of chippings and then the perimeter insulation of the base slab. The foundation earth conductor (installed by the construction company) is designed as a kind of ring earth electrode. Unfortunately, it only surrounds 4/5 of the building and at one point it is routed upwards from the outside through the strip foundation into the base slab. The concrete was then quickly poured and the slab completed. I was able to take 1-2 photos but no more. Upon later review of the pictures, I noticed that the earth conductor has no connection to the reinforcement of the base slab.
I now strongly fear that the grounding system was built/installed incorrectly. After some research, I assume that actually a ring earth electrode outside the building with a functional equipotential bonding conductor (FPAL; attached to the reinforcement every 2m) would have to be installed in the base slab.

Am I correct in my assumption here?
If yes, are there options other than demolition to retrofit an FPAL onto the base slab?

Regards
Mr Unkown

EDIT: Attachments had to be removed, sorry

The slab rests on insulation. A foundation earth electrode in concrete (with connected reinforcement) would not have a sufficient function due to lack of contact with the soil. You have therefore been given a foundation earth electrode in the soil. Placing this in the leveling layer is also normal.

Thank you for the quick response

The slab is on insulation. A foundation earth electrode in concrete (with connected reinforcement) would not have a sufficient function due to lack of contact with the soil.

Exactly, that’s why I assumed that the "ring earth electrode+FPAL" variant would be the right one

You have therefore received a foundation earth electrode in the soil. Laying it in the blinding layer is also normal.

That would at least be the case. Although it is not a closed ring, it lies in the soil.

But shouldn’t the earth electrode still be connected to the reinforcement? Because that is definitely not the case at the moment.

Regards

Yes, the probation is included and is called potential control and has nothing to do with grounding sensitivity. The grounding in v4a should normally be carried out by an electrician and not by the construction contractor. Better to talk to the future electrician who will carry out the work on your house about it right away.

[*]Since the replaced edition of DIN 18014:2007-09, the installation of foundation and ring earth electrodes is exclusively reserved for electrical or lightning protection professionals licensed by a VNB.
[*]These must create a measurement documentation supplemented by plans and detailed photos with measurement of the transition resistances before concreting.
[*]In contrast to a draft standard from 2012, the current DIN 18014:2014-03 no longer mentions delegation of installation work to the shell construction company.
[*]In double-sided fully insulated frost skirts according to figure 13 of the current DIN 18014:2014-03 but also the somewhat different figure 13 of DIN 18014:2007-09, even with loose reinforcement, the foundation strip can still have a strip or round steel as a foundation earth electrode in the base if it is soil-contacting without a capillary breaking layer and no waterproof concrete was used.
[*]In the case of frost skirts only partially insulated on the outside and not insulated on the inside, intensive soil contact can be assumed subject to normal concrete.
[*]For waterproof concrete, ring earth electrodes with a maximum mesh size of 20 m x 20 m are required with and without perimeter insulation, and with lightning protection system a maximum mesh size of 10 m x 10 m.
[*]Where ring earth electrodes are required, they must be laid in the floor slabs with or without LPS potential equalization conductors with a maximum mesh size of 20 m x 20 m like a foundation earth electrode, connected to each connection tag or every 20 m of building perimeter with the ring earth electrode.
[*]Where this was omitted once again due to ignorance of standards, it can no longer be repaired with economically justifiable effort.
[*]I refuse to believe that in this object only a strip earth electrode was once led transversely through the frost skirt and then further through the floor slab without any connection to the reinforcements.

Yes, the reinforcement is connected and called potential control and has nothing to do with soil contact sensitivity. The grounding in V4A should normally be carried out by an electrician and not by the construction company.

DIN 18014 specifically names this in 4.3 Functional Potential Equalization and in 5.7.2 Combined Potential Equalization System (CBN). Also for this and not just for ring earth electrodes made of stainless steel (V4A), exclusively licensed electrical professionals according to NAV § 13 are authorized to work according to the standard text.

That only one strip conductor was laid across the frost skirt of this structure and then further through the base slab without any connection to the reinforcements is something I refuse to believe.

I have quickly made an overview of the installed grounding conductor with pictures from the day before the concrete slab was poured and two more pictures during the pouring (see attachment).

If I interpret this correctly, my grounding conductor is useless.

EDIT: Attachments had to be removed, sorry