Last week I lost power to my new garbage disposal. I opened the box to find this:
There are three cables coming in from the bottom. Two of these are somewhere downstream from the Panel, not too sure. The other goes to the garbage disposal.
There is a cable coming from the top, There previously was a switch that controlled the sink lamp. I wired its hot wire through a new switch, now it turns on my kitchen lights instead (The kitchen light already has two other switches that control them). It could have been my mistake.
I'm suspecting this is a MWBC but I'm not very experienced so I don't know how to identify and how to fix. It seems like there are two circuits from the breaker box involved. At the breaker box, the two circuits are not handle connected. How can I trace and diagnose each of the cables in this box?
Best Answer
Years ago handle ties were not required. They have been for decades , if you think it’s is a multi wire turn off both breakers verify both hots in your box are dead, you can open your breaker panel and most of the time NMB or Romex is used. There will be a red on 1 breaker a black on the other going to a cable with a ground and a neutral, that would be 100% verification.