ivanaa
New User
- Location
- New York, USA
- Occupation
- Other
Hello all,
Just wanted to say this is a great forum with lots of good info.
I have a question regarding MWBC in a residential setting for an initial assessment and job planning.
Presently a Murray 8/16 circuit panel has 12 circuits installed, 4 standard sized single pole breakers and 4 tandem breakers but single pole breakers. It seems that there are at least 2-3 fewer neutrals than the 12 circuits - yet to fully trace everything - which means MWBs exist and even if they are split across phases, do not have tied breaker disconnections. Seems clearly a risk in both violating the NEC and for safety.
I am wondering if a MWBC can legally and safely be established with two tandem single poll breakers arranged such that one pole of one tandem breaker on leg A is adjacent to one pole of the other breaker on leg B with a handle tie between them. See the image for specific arrangement. Given the tandem breakers are already installed, we would like to re-use them. I believe this would meet code, even in NYC, and pass inspection. But wanted to get an opinion as I have not found clear guidance yet on Tandem breakers and MWBC other than the usual - have to have each leg on a separate phase to share the neutral.
Since we will be adding circuits, we will need to use more tandems or possible replace the panel.
Your input is appreciated.
Just wanted to say this is a great forum with lots of good info.
I have a question regarding MWBC in a residential setting for an initial assessment and job planning.
Presently a Murray 8/16 circuit panel has 12 circuits installed, 4 standard sized single pole breakers and 4 tandem breakers but single pole breakers. It seems that there are at least 2-3 fewer neutrals than the 12 circuits - yet to fully trace everything - which means MWBs exist and even if they are split across phases, do not have tied breaker disconnections. Seems clearly a risk in both violating the NEC and for safety.
I am wondering if a MWBC can legally and safely be established with two tandem single poll breakers arranged such that one pole of one tandem breaker on leg A is adjacent to one pole of the other breaker on leg B with a handle tie between them. See the image for specific arrangement. Given the tandem breakers are already installed, we would like to re-use them. I believe this would meet code, even in NYC, and pass inspection. But wanted to get an opinion as I have not found clear guidance yet on Tandem breakers and MWBC other than the usual - have to have each leg on a separate phase to share the neutral.
Since we will be adding circuits, we will need to use more tandems or possible replace the panel.
Your input is appreciated.
