I just replaced my 15 amp outlet with a new decora 15 amp receptacle. I noticed even before disconnecting all of the 14 ga copper wires that when I tested each neutral wire that two neutrals were hot.
Originally they had two neutrals wired nut together with a hook to the receptacle coming from one of the conduits. The other neutral came from another location. Even after resembling it and test it with the sperry stop shock it was green or wired correctly.
Why are these neutrals hot and if so should i separated the hot and wired nut those? I didn't use a voltage meter which maybe i should had. I did us a Klein non-contact tester. Again this was the original wiring from 40 yrs ago. Suggestions would be appreciated. I also replaced all of the wire nuts and cut and stripped away copper wire as well as adding some new wiring.
UPDATE: I took it all apart the 14 ga wire from the receptacle. there are only two conduit s that feed into this box conduit 1 and conduit 2. (See all pictures below.)
I then took my voltage meter and check each white neutral wire with my klein clamp meter alligator ears which showed zero except for one voltage reading of white with a black mark on neutral wire which was only a small or negligible reading. The blue wire in the back was for a split connection and was never wired up. Put everything originally back with only one hot black wire i mark with red tape.
Saying all of this, i noticed that if i disconnect the one neutral with the black mark all of my receptacles/outlets that are controlled by that 15 amp are turned off. Why? Why not that one to be off while the other receptacles should just be turned on. Why are the rest not working? Yes the sperry stop shock test works perfectly on this receptacle. Also used a breaker finder to see which two wires are truly connected to thar one 15 amp.
If that was run in a series could that be an explanation of when i disconnect that white neutral -black mark can cause 20 receptacles/outlets to shut off? Would appreciate the help. How could this happen? Yes it works and as i mentioned earlier in another question about adding another amp to split this 20 receptacles/fixtures/switches.
On second thought, i think this also happened with any outlet that i replaced with none of then working. Would have to double check that fact. Again i didnt do anything different but to replace the receptacles and switches as they had it originally wired. Thank you again.