Originally Posted by
Dave Mortensen
I call out shared neutrals on a neutral bus bar due to the possibility of a backfeed situation. With the setup on this panel where each of the 12/3 wired circuits share a neutral, shouldn't their be a tie between the breakers to ensure that you turn off both circuits sharing the same neutral?
Dave,
No. Only if both circuits are connected to the same device, such as one to each half of a duplex receptacle outlet or switch. It would be a good idea, though.
On an additional note, I try to trace the multi-wire circuits to ensure that they do indeed read 240 v across the two "hot" conductors. If not, it is possible to overload the neutral. In that panel it should be fairly easy to trace the conductors. Many of the panels in my area are too tight to effectively do this.
By the way, the grounds are bundled. But you probably already knew that.