I have a 1948 house that has mid-century conduit throughout. All old two-prong outlets in the old house; only the 1980s extension has your typical 14/2-G.
Anyway, in the old house (as the title says) my finder is locating two circuit breakers associated with a single outlet.
I haven’t looked closely at this yet but strongly suspect that the last homeowner replaced a two-circuit outlet (where one was controlled by a nearby switch) with a single circuit outlet. There is an extra switch in my living room - doesn’t appear to do anything - so this seems about right. If its load is also on the outlet then its return will be affected too.
So could the outlet be going back to the panel across two different circuits? Not sure there’s a way to test this without taking out the outlet and testing everything in there w/ a multimeter in tandem w/ the light and breakers.
Any thoughts? Could it be something else?