Quote Originally Posted by Jim Neeley View Post
Alimonum wire has a much larger thermal expansion coefficient than copper. The resulting deforming of the wire during heating and shrinkage of the wire during cooling has been traced to many house fires. Quite a number of years ago in Alaska aluminum wiring was outlawed and I remember hearing the trend was speading nationwide but I have no idea how far or how fast it went.

As for me, I'd look hard at replacing the aluminum with copper, but YMMV.

Jim Neeley, EE

Aluminum alloy conductors are allowed by the NEC & if installed correctly is safe & reliable