Proper grounding in steel fiber concrete and black tank

If the grounding in the base slab is BELOW the sealing in the natural soil (also below the bitumen sealing and the leveling layer), this is correct for the time being. If this was documented, photos must also have been taken. Have this entire documentation handed over to you. Show it to your other electrician. The grounding resistance can be proven by measurement, have it done, this is also part of it. Any subsequent grounding, if still necessary, may ONLY be done by the electrician. The documents belong to the house, so in your hands.

Lightning protection is not needed, neither for the house nor for the photovoltaic system. Except: (1) the photovoltaic system has over 30 kWp, then it is recommended (2) your house is located on an elevation, is significantly higher than the other buildings, there are no trees and the other houses also do not have lightning protection

Whether lightning protection is useful can be determined through a risk analysis. There are lightning protection specialists for this.

If the grounding in the base slab is BELOW the sealing in natural soil (also below the bitumen sealing and the blinding layer), that is correct for now.

This is then a ring ground electrode which, since the obsolete DIN 18014:2007-09, must consist of corrosion-resistant stainless steel, material number 1.4571 (V4A), min. 10 mm round or 30 mm x 3.5 mm flat. In the reinforcement of non-earth-contacting foundations/base slabs, a functional equipotential bonding conductor must also be installed LIKE a foundation earth electrode and connected every 2 m to the reinforcement as well as each connection tab or max. 20 m building perimeter to the ring ground electrode. The maximum mesh size for both systems is 20 x 20 meters.

The grounding resistance can be proven by measurement, should be done, and is part of it.

Measuring the soil resistivity is useful, but since the first VDEW guidelines for embedding foundation earth electrodes in building foundations from 1964 over obsolete DIN 18014 predecessors, curiously NO obligation. Even with lightning protection systems, the previously obligatory > 10 ohms is now only a recommended guideline. With and without lightning protection systems, measuring continuity resistance is mandatory. The value has changed from ≤ 1 ohm to currently ≤ 0.2 ohm. Lightning protection systems are only required by building regulations for certain buildings but may be advisable after elaborate risk analysis according to IEC 62305-2. This is practically only possible software-supported with the DEHN toolbox, which only a few roofer companies active in lightning protection possess and master. For photovoltaic systems, a lightning protection system may be required from ≥ 10 kW from an insurance law perspective and not only from 30 kW if the non-binding VdS guidelines are contractual. With a lightning protection system, a closer mesh size of max. 10 m x 10 m is required for ring ground electrodes, and the connectors must be certified according to IEC 62561-1 as lightning current capable. Photovoltaic modules are protection insulated, which is why, contrary to frequent claims, without a lightning protection system no equipotential bonding of the frames is normatively required.

So far, the earth propagation resistance had to be measured and recorded during the E-Chek. Then that is probably history as well. The main thing is that the thing sticks out somewhere and that's that. That would be a good step backward,

The main thing is that the thing sticks out somewhere and that's that.

That is exactly the usual non-compliant practice:

[*]Grounding systems are predominantly NOT installed by licensed electricians as required by DIN 18014:2007-09, but continue to be laid by masons.

[*]The majority of electricians, who often do not know either the obsolete or the current version of the standard, are satisfied with a glance at steel protruding from the ground to declare grounding systems of questionable suitability, never seen before in the meter registration, compliant without scruples.
[*]Anyone caught as an electrician with this deceitful practice declares the usually never read DIN 18014 to be impractical.

The few EFK exceptions who can still show a contractually compliant VDE subscription and who actually know the standard are unsettled by the bvs statement. None of these experts spoke up during the interpretations on the draft portal.