I was having a discussion with someone on a differant board and it was brought up that Aluminum wire could not be used to feed from service to panel. It was a not an electrician. Is this true and what is the reasoning behind it. Here in the state of Utah it is all that is used and don't see any problems with it when used correctly.

He also stated that for any home that is going to have central AC they had a 200 amp minimun on service requirments. Regardless of your load calculations.

Whats the scoop on this.
Thanks Bomzin