I'd like to see something on steel for wire, especially in flex applications such as on milling machines and moving hoists. Steel can be "springier" if that's a word. It does conduct electricity. It's also stronger than copper and aluminum.

I have to work with moving machinery and hence moving wiring harnesses, and I have asked the makers of "continuous flex and continuous torsion" cable on many occasions to give me better stuff, and suggested steel to them.

We had a mix of steel and copper in our wire in the Army. When splicing, we would brush the exposed wire. The copper strands would stay bent and the steel would spring back straight. As I recall, we tied the stronger steel strands together in a knot, then wrapped this knot with the copper strands, and covered the whole thing with tape. This was commo wire, not HV.

If you find anything on using steel for wire, I'd be interested. Unless I'm missing some non-starter issue, I think that at least the flexible cabling industry is missing out.