Guys, I know I maybe in the minority here, and as to exact data I dont have it, I do however have some experience with multiple GC's who are doing their own wiring installations calling and complaining about AFCI "nuisance tripping" when they try to use their "table saws" or similar tool, when I explore what is happening I find multiple receptacles having loose connections, loose terminations on breaker, and one time even found a finish nail driven into a wire. When I correct the terminations, suddenly the table saw is no longer tripping the breaker. I have even just for kicks trade out AFCI to standard breaker prior to investigating to see what would happen, breaker didn't trip under table saw load, seeming to validate GC's impressions, but I went on to investigate and found those loose connections, sometimes a full turn and a half loose, tighten connections and replace the AFCI and the saw no longer tripped the breaker. To me that seems to indicate the AFCI is doing what it is promoted as doing. Sorry that is as close to "data" that I can come up with.