"It is just limited to systems above 50A draw."
If it's not safe for 20A house circuits (I know of many Aluminum Romex cables that have fried in-wall,) why in the world would it be considered safe for 50A or higher, unless the wire was incredibly thick?
"So your electric or induction stove. yea that is probably wired with aluminum."
Brand-new model. 100% copper wiring excepting the heating elements and brass connections for the wiring/plug, internal and external.
"The main supply lines for your home yep aluminum too."
Of such an incredibly heavy gauge for the relatively little amperage being fed to my place.
" You have a sub panel, that is most likely being feed with aluminum."
Brand-new panel, pure copper buses, including the Main. GE 150A panel, GE 40A sub.
" it wouldn't be hard to guess that the installer used aluminum even if the instructions say not to feed it with aluminum as I have seen that far to often"
That would not pass an inspection if it's labeled as such - which means it wasn't properly inspected in the first place and the person doing it was an idiot. I hope you aren't trusting these people. You know why we don't mix copper and aluminum? Risk of fire from high resistance junctions. NEC only allows anything like this for service entrance runs or short-distance subpanel connection, and only if two conditions are met:
A. Mechanical termination (No wire nuts, no soldering, no clips. It must be screwed in place.)
B. The panel bolts and lugs are rated for aluminum wire.
Some jurisdictions go even further and require anti-oxidation paste be applied to the lug and wire at the terminal.
We've got a Master Electrician that handles the repairs and changeouts on the chargers for our forklifts at work. You know what his rule is for using Aluminum? Use Copper Instead.