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    Two separate circuits cannot connect their neutrals together. Two breakers on a MWBC can share the neutral. Older MWBC circuits did not need their breakers together and have handle ties. Neutral must be white. A white wire does not need to be neutral, as in switch loops or three way switches. You are lucky if they are marked as not neutral. Just a bit of information to further confuse you/us. Always check for no power before trying with your fingers. Commented yesterday
  • I don't think this is MWBC. There aren't 2 circuits in one box. It's 1 circuit + travelers from another circuit. Looking into it more, it's actually crazier than I thought. Where B1 comes in, it goes out B2's neutral, B2 goes out B3's neutral, and so on. Not consistently though. Some places do have 2 circuits going to the same neutral wire. Commented yesterday
  • Code is different in different countries. Nobody can answer a question about what "code" is, unless you say what country you are in. Commented 11 hours ago