Jerry Simon Posted September 23, 2018 Report Share Posted September 23, 2018 (edited) Two separate 120-volt, arc-fault types of circuit breakers were protecting the 240-volt air conditioner's circuit at a house. I know a 240-volt breaker should be installed, but what about the use of arc-fault breakers? I suspect nuisance tripping might occur. Edited September 23, 2018 by Jerry Simon f Quote Link to comment Share on other sites More sharing options...
Marc Posted September 23, 2018 Report Share Posted September 23, 2018 The compressor motor has no brushes and those little window units don't have start capacitors that switch out, so I don't see why it would trip an AFCI, assuming no defect. Do the codes call for an AFCI on a window unit? Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted September 24, 2018 Report Share Posted September 24, 2018 6 hours ago, Marc said: Do the codes call for an AFCI on a window unit? Not if its fed with 240 volts. The NEC only requires AFCI protection on 120-volt single phase 15- and 20-amp circuits. Quote Link to comment Share on other sites More sharing options...
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