Replacing Aluminum with Copper Wiring: Feasibility of Installation Above Suspended Ceiling?

Hello,
During the renovation of the house, I decided to replace the old aluminum electrical installation with a new copper one. There will be a suspended ceiling in each room. I wanted to ask experienced electricians if there are any contraindications to place it above the suspended ceiling instead of boxes and cable routing in the plaster and to lead the cables vertically from above to the sockets in the plaster? In addition, I wanted to know if in the room where the TV will be located, I could use 3x1.5 mm cables instead of 3x2.5 mm?

greetings
Emil

cable in a conduit, cans and so will be above the ceiling - inaccessible. 2.5mm is used for socket circuits.

As my colleague wrote above, the cable should have some protection against mechanical damage (e.g. conduit). As for the cans, in this case the most practical solution will be a canless installation. It will take up more wire, but in the event of a breakdown you won't have to smash the ceilings.
Of course, if you already use conduits, it's best to install them so that they are removable

with a conduit it's hard to do

Thanks for the answers. I am aware that I could get to the cables only after breaking the ceiling. Instead of cans, I just wanted to twist the cables and put them on this suspended ceiling, but I do not know if it does not differ from the standards governing the installation of electrical installations.

to turn? Are you kidding me?

Maybe leave this installation replacement to someone who has the authority and knowledge.

I think the cables need to be connected somehow. On other forums I read that twisted pair is a sure connection point. And what do you suggest instead of a twisted pair?

Make a good twist and break the twisted pair, insulate it, put it in a sealed airtight box. In practice, most electricians do this, and that's fine.

I had a similar case to the thread described by the author.

Our solution was like this:
We hung PVC trays (upside down) on the ceiling, and arrange the cables to the rooms in the trays. When laying the cables, pieces of 2-4 cm covers were helpful, with which we blocked the cable so that it would not fall onto the floor.
If there were more sockets on the same wall in the room, we made one furrow vertically and the rest horizontally.
It was a great album and the difficulties it involved. We had to do some of the installation with a flat DYT cable.
All canned joints so as not to demolish the ceiling.

We decided to use lockable trays, because during the works, additional customer requests were on the agenda.

Hello!

Peszel in such installations is a pointless excess of form over content.
One of my colleagues presented the use of a PVC trough. And this is approximately how it should be done. In addition, pipes should be placed in the walls between the fixtures and the space between the suspended ceiling and the ceiling, and of course no boxes in this space. Pipes, of course, of the right diameter and in such a number that the possible replacement or addition of new cables does not force the walls to be forged again.
All connections should be made in boxes under the fittings.

Nowhere in the world is g / k disc treated with such exaggerated care as some colleagues recommend here.
Cutting out any mounting holes and their re-patching is a cost of several dozen zlotys. So it's time to end this exaggerated concern, no matter what.