You are welcome, and sparky and I need to re-focus on the big picture and less on minutia. But one final digression (I just love this stuff):
On top of the hill above my house, through the old Santa Teresa mercury mine, runs a high tension power line, one of the 3-phase (i.e. three hot wires plus one neutral) "medium voltage" (below 69 kV) lines used for transmission around residential areas. Within the last decade our power company PG&E has quadrupled the capacity of this line. They replaced the large single copperweld cables with four separate aluminum/composite core cables and a series of conductive spacers that kept the conductors separated by a few inches.
The towers themselves remain the original galvanised steel lattice structures. The original single copperweld cables were replaced with "quad bundle" carbon-core aluminum cables, which look like this on the tower:
...and the construction of each cable is like this:
...where a carbon fiber composite core, clad in woven composite sheathing, is surrounded by two layers of spiral-wrap aluminum conductors, wrapped in opposite directions. The aluminum has a clear "anodized" finish that is further weatherproofed and passivated by chemical "greases" injected between them as the cable is crimped round in roller dies.
The net/net is that the quad bundle of four new technology carbon fiber/aluminum cables carries four times the current and power of the old copperweld single cable, while weighing only slightly more, even when you add in the weight of the spacer/dampeners.
While I never worked in Power Engineering (which was part of my common core EE curriculum)(my trade was computer hardware design) and I studied the topic decades before the new technology cables existed, I learned the above facts from one of the PG&E crew foremen, who happened to share my love for PNG (Papua New Guinea) coffee, one afternoon at the local coffee shop.
Incidentally, the mechanical tension on the composite power cables is even higher than on the copperweld original, to control wind movements. The carbon fiber core carries all the weight of the soft aluminum conductors, and has almost no stretch in it compared to the original and much more elastic steel.