Alcan was at one of our IAEI meetings explaining the different alloys of aluminum and why the old style devices had problems. It basically comes down to the difference in expansion rates of steel screws and aluminum. If they have brass screws like the CO/ALr this rate is a lot closer and you don't see that problem. They were also pitching the new MC cable with the aluminum bonding wire. Time will tell on that one. I doubt that will be "wet" rated like most MC these days.
