I have many clients that can not run the "kirby" type vacuums when plugged into their ark fault circuits. I have trip them out many times using a drill, during a install at a clients house. Just a personal note here. does any one out their think, that when devices became "U.L." listed to being installed by "stabbing" them. And now 15 to 20 years later we are see the result of that method of instalation. What ever happen to the "pig tailing " method of connecting devices to the circuits. Maybe its just me, but this I beleve is just another imposed code as a result of the acceptance of a lower quality of workmanship. In the effort to save time. And the truth is we as contractors have allowed it. Please, these are my thoughts I'm not trying to start a discussion over it.