Proper grounding in steel fiber concrete and black tank

Hello everyone,

we recently started building and are trying to do things ourselves as much as possible. After we had masoned the basement, our electrician approached us and said that before we carry out the sealing of the basement exterior walls, we need to lay a grounding tape in our construction pit because this is necessary due to lightning protection and the photovoltaic system to be installed later. In addition, we would have to connect this with the already existing grounding tape and drill through the exterior wall for this purpose and then seal it later (therefore before sealing).

We already have a grounding tape (round bar) under the foil beneath our steel fiber concrete floor slab. This was routed up into our technical room.

Why should I now basically do the same again in our construction pit?

I am slowly running out of ideas about what is correct here. Can you explain this to me?

Many thanks in advance!!!

We already have a grounding strap (round rod) under the foil that lies beneath our steel fiber concrete floor slab. This was led upwards into our technical room.

Who has inspected and documented the grounding strap under the floor slab? To my knowledge, your electrician must do this before the concrete is poured.

Who removed and documented the grounding tape under the base slab? To my knowledge, your electrician must do this before the concrete is poured.

This is how it was done. Our construction company installed the base slab and the grounding tape underneath. Their electrician documented and measured everything before the concrete was poured.

Ask your electrician why he wants it that way and try to get both Elis to talk to each other.

If I have understood correctly, you have grounding under the basement slab. The second electrician now wants grounding outside the foundations around the basement, and you are supposed to do this yourselves?

If I understand correctly, you have grounding under the basement floor slab. The second electrician now wants grounding outside the foundations around the basement, and you are supposed to do this yourselves?

Yes, exactly. It makes no sense to me from start to finish, or at least I don’t see it. He said it has to be that way for the external lightning protection and the photovoltaic system. But according to our electrician, we only need lightning protection. I don’t think we have to have that.