Closing large wall gaps

Hello everyone,




As you can easily see in the pictures, I have a lot of electrical cables, all of which required a corresponding groove. Now all the cables are in place and the large recesses need to be filled, especially the large gap at the back right in the picture.

Should one work here with the usual suspect bonding plaster (Rotband from Knauf, for example), or are there special materials that are more elastic and do not crack over time, or at least significantly reduce the likelihood?

For crack bridging, I will of course incorporate appropriate fiberglass fleece, etc.

What is also important to me is if the filling material is so "strong" that it can give some stability back to the masonry, even if only a little, which I, for example, cannot imagine with Rotband.

Can one work here, for example, with masonry & plaster mortar, or even cement mortar? Are NYM-J cables allowed to come into contact with it?

Thank you very much in advance and best regards
Scami

I am surprised that the cables here apparently do not branch off from the fuse box; and relieved that they are apparently almost only plaster grooves, because otherwise they would be statically undesirable if they were transverse. I think that adding fibers would be more clever than integrating a fabric.

Um, how deep did you cut and how thick is the wall?

May I point out, even though you didn't ask, that I see two little problems here?

Long and deep horizontal slots could affect the structural integrity. Has this been planned and/or approved by a professional?

In addition, bundling many power cables too tightly leads to load capacity problems (the cables get warm and the maximum possible load decreases). Sometimes (and I consider this possible here) in relevant magnitudes. So, as a precaution, an electrical master should take a look before you close it up again.

I am surprised that the cables here apparently do not branch off from the fuse box; and relieved that they are almost exclusively plaster grooves, because otherwise they would be statically undesirable if they ran across. I think that adding fibers would be more clever than integrating a fabric.

I think I recognized upon closer inspection that the grooves are significantly deeper than the plaster. Hence my contribution, apparently written simultaneously ;)

Ah, and communication cables routed parallel to power lines for a long distance are also not an optimal solution.

Who planned this cable route? Is this new construction or renovation of an old building?