Last fall I bought the first AFCI breakers my supply house sold. I installed one in my shop feeding a single Hubbell CR-20 duplex receptacle. I plugged everything I could find into this outlet to try to trip the breaker with no success. My Ideal GFI plug-in tester was the only thing that tripped it other than a direct line to neutral short or a line to EG short. I posted my results on several of the forums at the time but got little response. I installed 3 of these in a new custom home this spring. The inspector made sure to see if they were in the panel but said he had no way of testing them. They haven't spontaneously tripped yet and I don't believe they will. I just hope they function as a standard 20A over-current device should if the need arises.
