Using "Al" in preference to "Cu" wasn't the point. You said you'd use XHHW... implying that XHHW was "Cu" only. XHHW is available as either "Cu" or "Al" conductors. If your supplier doesn't stock it, or you commonly use something else, that doesn't mean "Al" XHHW don't exist.Bob asked a question,"What would you use?" So I answered it. You may not see AL anything but all that means is your doing a different type of work. When it comes to making money and there is nothing requiring CU in the spex Why not use AL? It is less expensive, it preforms just as good as CU (if not better) and it is easier to work with. I would even argue, to a tree hugger, that it is "GREENER" then copper because it is less dammaging to the environment.