Is it possible to consistently use different cross-sections for LEDs?

Question

Do it yourself

I am attaching an example diagram, please let me know.

Answer 1

Oh sure. Everything is fine on the diagram, 2.5 squares for a current of 1.7A (24v, 40W) with a large margin, they are designed for 25A. Similarly with 6mm ^ 2: 40A cable and ~ 7A consumers ...
You can use 1.5 squares everywhere, it will come out cheaper, but it will do. Automata and so on for 24v are not needed, but in front of the PSU you can just plug it in.

Answer 2

the cable section is selected from the current passing through this cable.
so yes. and not only is it possible, but it is necessary to calculate all the electrics and lay the correct cable section.

Answer 3

According to your mind, 2 conditions must be met:
- the cable cross-section must correspond to the current
- the circuit breaker of this line must correspond to the cable cross-section (namely, the entire line, if this av also protects sockets, then it must be 16A, and the minimum section for lighting 2.5 sq. mm should be

Answer 4

Here, of course, they correctly said about the calculation of the current cross section, but they forgot that this is a low-voltage circuit and voltage drops are not allowed.
It’s sad if your distant tape shines dimmer, because only 23 of 24 volts reached it.
Here is an example of a calculator that gives the voltage drop on the cable https://www.ivtechno.ru/raschet_4