or possibly a motor,,,If it was for an AC it could be fine.
or possibly a motor,,,
as shown, it depends on many varibles, type load, actual load, wire type, ambient, conduit fill......................
I looked at it today and it's for a residential range or oven. The wiring is in conduit.
I received an inspection report listing this as a violation.
It was an unusually thorough home inspection report.
Is the range hard wired all the way or connected to a receptacle?
I don't have my code book with me, but there was a section that covered minimum wire sizes for receptacles........and a 50amp was listed as #6 minimum regardless of conductor type.