Electrician drills a hole in a partition wall

No, that’s what I meant by the shortest way. Either to the floor or towards the attic, bundled there and then in a small shaft towards the HAR. So you mean the hole doesn’t make much difference? Just bring it up that they should seal it properly?

I am not an expert in this, but as far as I know, 11.5 cm walls are not allowed to be horizontally chased (or only to a very limited extent). You need to ask someone who knows about this.

You will not solve the "problem" by patching. But it's better to get a few other opinions.

If it is going to remain like this, then it is certainly a weak point, as has already been recognized.

Horizontal slotting is probably not okay for load-bearing walls. Otherwise allowed up to 1.25 m (?), but should be avoided.

Applies in my opinion only from 17.5 cm stones. For our electrician, it was a no-go to run horizontally into an 11.5 cm wall.

Assume that is the reason why he did it that way - only one side slots for cables.

It was important to me that each room is on a separate fuse. If he connects these two sockets on one supply line, this is no longer ensured.