Tony Hwang wrote:

Hmmm,
Give me one instance of house burning down with Al wire. Properly done,
it's not that bad. My last house where we lived for 20 years had Al
wire. Never had any trouble. If it's done shoddy, then it's different.
But shoddy work with copper wire is not any better. Knowing what/how to
do using proper parts is the key.

Try this: http://www.inspect-ny.com/aluminum/aluminum.htm
Scroll down about 1/4 of the page and check out "Aluminum Wire Failure
Reports & Photos" There are 110 electrical fires a day in the USA.
All of them because of copper wire?