Comment on Geologists doubt Earth has the amount of copper needed to develop the entire world
carbs@lemmy.world 1 week agoI’m not defending the article, but I think most overhead power lines are aluminium, which is probably good as it’s abundant compared to copper.
Geodad@lemm.ee 1 week ago
The problem with aluminum is that it gets REALLY hot when current is run through it. It used to be ised to wire homes, but is now banned because it wasn’t safe.
SomeoneSomewhere@lemmy.nz 1 week ago
That’s incorrect. Aluminium is about 30% worse by volume than copper, meaning you need to go up a size. What stopped it being used for houses was that the terminations weren’t good enough, because aluminium has different thermal expansion and corrosion properties, plus they were using much worse alloys. That’s now mostly fixed and if you’re in the US, there’s a very good chance that your service main is aluminium, and there’s talk of allowing copper-clad aluminium (CCA) for subcircuit wiring.
Per mass, aluminium is a better conductor, which is why it’s almost exclusively used overhead and in pretty significant volumes underground. The power grids were built on ACSR.