Plastic box, Cutler Hammer Breaker, no room overhead without cutting ceiling joist in to for MC cable, ohm check ok with no readings between neutral and ground, or hot to ground or hot to neutral. Once I take the wire loose from the circuit the breaker holds. The breaker I switched to test it was a 15 amp AFCI and done the same way. No way the contractors going to tear down the wall blush When I fished the new wire down the wall, it tore some of the insulation off the "pull" wire, but I didn't see any "nicks" in the conductors. The inspector told me a few months ago, they may change the rule for AFCI's again that would only include the bedrooms again. I may have to let it fall under that wink