I think this thread is getting way off-topic
the use of AL for large-size feeders has been debated many times on this forum. We don't need to get into it here.
for the underground LV stuff I think it would not work at all, considering the connectors usually tap the insulation of the wire, and AL turns to white powder real qick with even a small hole in it I don't think an installation in this manner would survive more than a couple weeks
just MHO
-Will
