14 awg circuit connected to 12 awg wiring?
I recently discovered an unlicensed person who wired my basement used 14 awg for a 15 amp circuit...yes thats ok but, the basement was remodeled from a 1960s wiring, the person terminated 12 awg armored cable to a plastic box and connected the 12 awg to 14 awg romex wiring. They connected the bare copper wire of the romex to the jacket of the armored cable for gnd. I tested for resistance and there is not really any resistance of the copper wire with the jacket. Is this really a big deal? I know it isnt code after I read up on this. But is there any imminent danger from this? The circuit is 15 ampere, so both conductors handle it perfectly. I could rerun the other end of the circuit with 14/2 romex. But is it ok to leave it like it is?