I am going to run a sub panel to my detached garage undergrond in plastic conduit. It will be a 50 amp subpanel, I was told I could use alum wire (6 ga) seems ok since the feed coming into the house is also alum. I thought it was unsafe to run alum cable? Or was that just back in the day. It sure is cheaper than copper.
You can use Aluminum. It is usually used for services and feeders, but not on branch circuits. Dont nick the wire when you skin it, Use a wire brush to shine it a bit. use penetrox to prevent oxidation. Wiggle the wire near the screw when tightening . Tighten it a couple of times, it tends to loosen a bit. Make sure your lugs are rated for aluminum and never let share in the same connection with a copper conductor. They must be separated.