Also note that switch/receptacle replacement, on a circuit done with Aluminum wire, should be done with devices that are Aluminum rated, CO/ALR. Standard off the shelf devices are not Aluminum rated. An electrical supplier may have to order the Aluminum rated devices. Split bolts and other connective devices also need to be Aluminum rated.
Connections/Splices of Aluminum to Copper are also subject to reactive deterioration. Split bolt connections, designed for a Copper/Aluminum termination, will have a plated spacer, to be installed between the two dissimilar metal conductors.
When I needed a few devices for a branch circuit that was run with aluminum wire, I found that the selection of CO/ALR pieces at the local big box home center was very limited and they were considerably more expensive. (Of course I purchased them)
On another occasion, I wanted my contractor to use specification grade outlets on a project at my house. I skipped the home centers, and went to one of the local electrical supply houses.
