These pics simply show burned nuts. I have seen many burned nut on copper
applications. A loose connection causes arcing which gets progressivly worse.
It's not the aluminum, it's the bad connection. Think about it. How many millions
of connections are NOT burned? Why are the rest of the splices in that house not burned? Why are there not burned nuts in every
these links are from people selling product
. They are advertisments
. ALWAYS consider the source when doing internet research.
pictures (all the same connection) is obviously
homeowner/handyman work and the connection was not secure. The wires were not even twisted together at all.
pictures show five
#12's under a yellow
pic?...who knows....I can't even tell it's AL.
I can pick apart most
of the pictures there and I can honestly say that I've seen more that that many burned connections on loose copper joints.
My bottom line is: From a legal standpoint, use the rated methods. Mechanically there is no difference.