2 pole common trip circuit breakers are not required for MWBC'sHi, my house has a lot of MWBCs and I've learned to embrace them.
Curious to know if MWBCs are prohibited when associated with dedicated circuits required under 2011 NEC.
Keep in mind you need a 2 pole, common trip breaker for MWBCs as of late.
On the one hand I think it's common to use an MWBC to a well pump/tank pump setup. That's a fine idea, you wouldn't want one pump to start while you're working on the other, anyway.
On the other hand it might not be the best idea for an attic furnace, where a dedicated circuit for the heater and a separate dedicated circuit for an outlet nearby is called for. If the heater is tripping the breaker, you might need a trouble light or power tool to fix it. There are probably much better examples of places where it wouldn't be smart.
Specifically I'm wondering about dishwasher and garbage disposal.
Whatchyathink?
-Jeff
There is absolutely no problem with GFCI's on MWBC's if one knows what one is doing.You run into some complications with GFCI protection on multiwire branch circuits also.
Specifically the continuation of protection from the load terminals of a GFCI receptacle to additional receptacles cannot be part of the MWBC any more.
Now (both sides of) the MWBC can continue from the line side of a GFCI receptacle with additional GFCI units used downstream where needed.
Or a double pole GFCI breaker can be put in the panel to protect the whole MWBC.
They are in Ontario, Canada.2 pole common trip circuit breakers are not required for MWBC's
cool......They are in Ontario, Canada.
2008..210.4(b).multi wire branch ckts,shall have a disconecting means that will simontainously open all ungrounded (hot)conductors at the point of origination.2 pole common trip circuit breakers are not required for MWBC's
That doesn't mean common trip, just tied handles.2008..210.4(b).multi wire branch ckts,shall have a disconecting means that will simontainously open all ungrounded (hot)conductors at the point of origination.
that what common trip is...That doesn't mean common trip, just tied handles.
No it isn't. Single pole breakers with handle ties are acceptable.that what common trip is...
that what common trip is...
Either way it will work.No it isn't. Single pole breakers with handle ties are acceptable.
since 2008 code.just not well enforced.I got the impression 2011 NEC finally does require common trip. If not, great: that opens up choices in panels and breaker selection in my project and further lowers cost.
Please stop spewing incorrect information.since 2008 code.just not well enforced.