Shared neutrals used anymore?

Just curious do any of you use shared neutrals anymore since it looks like most new circuits dont get them now, (especially emergency circuits)? I still see use for them in old buildings where you have existing conduit in slabs and its easier and quicker and diffinetly cost effective to use shared neutral to be able to use the existing pipe. on normal covient circuits. . I generally dont like them, but I do still see the use for them.
 

jap

Senior Member
DIY report, but as soon as I realized that double pole afci breakers were available for the panel in my home, I went back to MWBC wiring.

Jon
Doesn't that just needlessly create a "Trouble in one circuit shut down two" situation?

JAP>
 

roger

Moderator
Staff member
Location
Fl
Occupation
Electrician
Doesn't that just needlessly create a "Trouble in one circuit shut down two" situation?

JAP>
A MWBC is one circuit period. You simply tell the occupant you are turning off the circuit and it will kill a lot of lights and receptacles. Of course you can work it hot since the CMP put us in this situation.

Roger
 
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I too use MWBC's all the time. Just pulled lots of 120/208 full boats, usually 2 or 3 in a 3/4. A tip:. 3 single pole breakers with handle tie is much cheaper than 1 three pole breaker. Siemens does not make a three pole handle tie unfortunately, but Eaton does. Also with the handle tie you can remove it down the road for safer independent operation. IMO the handle tie requirement was one of the worst code changes and has greatly increased hazards. On this job I'll be removing all the handle ties after inspection.
 

James L

Senior Member
Location
Kansas Cty, Mo, USA
Occupation
Electrician
By living and working where we're still on the 2014 NEC. :cool:
🤔 Most municipalities around KCMO are still on 2011 which requires afci in all dwelling type rooms and areas. There's one munipality here, can't remember which one, which amended to only require bedrooms

KCMO proper, and a couple others, are 2017.

I don't remember knowing about any on 2014
 

James L

Senior Member
Location
Kansas Cty, Mo, USA
Occupation
Electrician
I too use MWBC's all the time. Just pulled lots of 120/208 full boats, usually 2 or 3 in a 3/4. A tip:. 3 single pole breakers with handle tie is much cheaper than 1 three pole breaker. Siemens does not make a three pole handle tie unfortunately, but Eaton does. Also with the handle tie you can remove it down the road for safer independent operation. IMO the handle tie requirement was one of the worst code changes and has greatly increased hazards. On this job I'll be removing all the handle ties after inspection.
I wired a restaurant last year, and bought handle ties for all my 2-and 3-pole mwbc. Eaton panels.

When I got final inspection, the AHJ noted that I didn't have many single pole breakers, and asked what gives. So I explained to him that I handle-tied my mwbc.

Him: what did you do that for? 🤔🧐
Me: 🤔 'cause it's required
Him: not here
Me: ok....so....ima take 'em off...?
Him: I would

Done
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Electrical Contractor
A MWBC is one circuit period.
Roger
Not sure I agree. The bold appears to suggest it is one circuit only in section 225.30


225.30 Number of Supplies. A building or other structure
that is served by a branch circuit or feeder on the load side of a
service disconnecting means shall be supplied by only one
feeder or branch circuit unless permitted in 225.30(A)
through (E). For the purpose of this section, a multiwire
branch circuit shall be considered a single circuit.
 

ptonsparky

Senior Member
Location
NE (9.06 miles @5.9 Degrees from Winged Horses)
Occupation
Electrical Contractor
As much as I used MWBC in the past, there is no way I would remove required handle ties. They aren’t there for those of us that grew up with, them. Remove if you want while trouble shooting but put them back. That next kid may not have the slightest.
Some area ECs were installing AFCIs then taking them out after inspection. Grrr.
 
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