Aluminum Electrical Wiring
Can aluminum electrical wiring cause problems?
Aluminum was used instead of copper in electrical wiring for a while around 1970, and it does have some potential problems. It is subject to corrosion and oxidation when insulation is removed. It also requires compatible receptacles and switches. Switches and receptacles should be marked CO/ALR. Because it doesn’t conduct as well, it generates more heat and it has a tendency to expand and contract so wires may loosen from terminals.