Brendan,
All commercially available AFCI's also have equipment level GFI protection inherent in the design. This would explain why the GFI tester trips the breaker. I am not familiar with the specs of these testers, but our sensitivity level, is 30 mA.
I would expect that these testers provide a ground fault load that only slightly exceeds the maximum 6 mA trip point for a Class A GFCI device. I know that the internal resistor in a GFCI receptacle creates a 8 mA fault to test the device. Would there be any other reason that these testers would trip the AFCI?
Don(resqcapt19)
