Alas, I have never been in a position to do any truly proper testing.
Mike Holt had a gizmo that mounted electrodes on a rail, and he could slowly separate them to make a controlled arc. I have not seen him use this since he visited AFCI central and 'drank the kool-ade.' IMO, his device would provide a very good demonstration of any type of AFCi.
Loose connections? I think we're on a unicorn hunt here.
