Why aren't stranded copper coated aluminum cables (CCA) widely used outside a small niche of speaker wires or 12 VDC applications?
According to this post the issue is with the insulation jacket which is either PVC or silicone and rated at 600 V.
I am asking because I want to contribute to this problem solving challenge by suggesting that multi-stranded wires are better conductors because they don't heat up due to a higher surface area, have no skin effect, and have overall lower resistance.
My suggestion is to replace NM wires in homes with multi-stranded CCA cables similar to this one. If the jacket is a problem surely engineers can find ways around it. With electric cars coming to more houses, we need better cables I think.
Next step is to replace low, medium, and high voltage power lines with the same multi-stranded cable. The low voltage lines are easy since they are sheathed.
For medium and high power I think that putting a soft multi-stranded cable inside this hard trapeze cable should work. These issues could be figured out if there is significant improvement in power transfer/loss. I feel when you need 700 kV to push 1 kA current through large regional power lines you're fighting the wire, because as wires heat up the conductivity goes down. With multi stranded wires there is no heat build-up.
Why is multi-stranded wire not used more widely if it's economically and electrically a better wire? Is it because it's too new?