I have a duplex outlet that appears to wired in series. The outlet appears to have 12/2 in and 12/2 out. My hot wire from the breaker box remains hot unless I have 2 different breakers off. I am getting 124V at the outlet. My voltage remains the same with both breakers, just breaker 1, or breaker 2. I have AF / GF breakers and I am not getting a fault code on either breaker.
I am using AF/GR breakers because there is no ground wire (I have an old home) and because the wires are <5.5 I am installing TR outlets. The plates are marked appropriately.
When I disconnect the opposite set of wires, I loose power to my outlets. This is regardless of what combination of breaker is on.
There is only one hot wire (when the outlet is disconnected) in the box. The other black wire does not have power. My neutrals also do not have power.
Do you know why this is occurring? What would you do if you were in my shoes?