Looking for the thinnest wire for very short distance power transmission.
Supply is 5V, 10A. Ambient temperature is 35C.
There are 5 consuming elements, each consuming 10W. The elements are linked together with wires, 10mm apart. Looking at wire tables, it seems that 20AWG is the correct wire to use but this is for "Chassis Power Transmission" and I can only assume it is more of a thumb rule.
Using a PCB trace calculator, for transmitting 10A over 10mm the recommended trace is 0.25mm^2 of copper, same is 23AWG wire. As distance is very short, voltage drop isn't a factor.