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How should a AFCI breaker be tested?

An AFCI receptacle used in the same circuit as an AFCI breaker would cause interference with each other and there would be constance nuisance tripping.  

Or are do you mean a "plug in AFCI tester"?  If that is the case, please see attached UL letter addressing using testers to test Eaton AFCI breakers.  

  1. UL letter for AFCI indicators.pdf
  1. UL updated AFCI test procedure.pdf