George,
I agree that the original aluminum branch circuit wiring was a serious problem, but in about 1973 a new alloy was put on the market along with the CO/ALR rated devices. These materials did not have the problems like the older stuff did. I worked on two apartment complexes at that time, one with copper and the other with aluminum. We continued to do the service on these units for about 20 years. There were no more problems on the aluminum than on the copper project.
Bill,
I have heard of many areas banning small aluminum branch circuits and I don't think any #10 or 12 aluminum is on the market, but I haven't heard of aluminum feeders being banned. The utility here uses only aluminum for everything except the grounding electrode conductor. A few contractors use aluminum for the service entrance and larger feeders in commercial installations, but most use all copper.
Don(resqcapt19)
