But you quoted this.
So 2x 24AWG cable would be half the value of the calculator as I only calculate *one" 24 AWG wire. So it would be correct.+24AWG(7/0.203 T.C)*2C --- means 2C(onductors) made with 24AWG cables
I am only calculating the DC resistance of the cable. Resistance of skin effect at whatever frequencies it's running at, could may well be different. But this is not actually relevant for the tests I am doing anyway because I am looking at the DC 5V distribution across the cable.bigbloke wrote: ↑Fri Oct 29, 2021 4:22 pmAlso the calculator is based on cable to "free air" (i.e. cable is entirely on its own) whereas you have 2 power cables (red and black) and 2 signals
(white and green for USB IIRC) all in a tight bundle - this will change the actual resistances measured vs calculated (yes can even reduce them due to inducted currents etc). And (last) also the calculator doesn't know that the cable is made of 7Cores, and the skin effect changes the current capacity and therefore the "effective" resistance calculation.
I could go into calculating impedances at various frequencies but I really just don't have that sort of time. Lots of fine cables is of course the best for data transmission and the signals look reasonable anyway. The impedances across that cable may well be better than DC resistance, who knows. They could may well be a lot less than DC resistance.