MWBC...all the same A?

[conmgt]

If two individual breakers are tied, can they serve a MWBC if the breakers are of different ratings? e.g. a 15A and a 20A breaker are tied and feed a 20A single recpt and a 15A single recept in the same box?

 

[infinity]

I see no reason why you couldn't do it that way. I would only ask why would you want to?

 

[conmgt]

Conduit/box fill, working with existing wiring, ???

 

[Dennis Alwon]

As long as the neutral is rated for the 20 amp circuit I see no reason why not.

 

[jumper]

As long as the neutral is rated for the 20 amp circuit I see no reason why not.

I agree; however, I gotta admit I find it a bit out of the ordinary, yet legal.

 

[al hildenbrand]

I see no reason why you couldn't do it that way. I would only ask why would you want to?

I find existing MWBCs just like this to be rather common in dwellings that were wired with a raceway method in the Thirties thru the Seventies, and where the service center wired for was most likely a fuse center.

Pulling a #14 and two #12 allowed a conserving of labor and material that installers then, in my work area, found attractive (think the laundry circuit with a general lighting circuit, etc.).

Upon upgrade and conversion to a circuit breaker service center, a handle tie between a 15 & 20 Amp single pole is the perfect solution.

 

[Little Bill]

I see no reason why you couldn't do it that way. I would only ask why would you want to?

Conduit/box fill, working with existing wiring, ???

I may be wrong but I think this has to do with the OP's other post about multiple outlets on a 240v circuit.

 

[conmgt]

yep, it does.