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    Shared neutrals...

    How many of you share your neutrals with lighting and receptacle loads in commercial jobs and how many don't?
    37
    Yes, I do share neutrals.
    70.27%
    26
    No way, I don't share neutrals.
    27.03%
    10
    I don't care.
    0.00%
    0
    Umm, I just do what I'm told.
    2.70%
    1
    Last edited by sparkyrick; 02-16-07, 06:40 PM.

    #2
    I run multiwire branch circuits anytime it is practicable.

    As most times my lighting is 277 I don't often have a choice to place receptacles and lights on the same multiwire branch circuits.

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      #3
      I plan my projects with as many MWBC's as I can regardless of the system voltage.

      Roger
      Moderator

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        #4
        I use MWBC's also. They are more efficient cost less.
        Lou (wannabe economist)

        If you relentlessly pursue perfection, you will eventually catch excellence.

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          #5
          Originally posted by hardworkingstiff
          I use MWBC's also. They are more efficient cost less.
          So in your MWBC's, I take it you share neutrals with lighting and receptacles then?

          Comment


            #6
            Originally posted by sparkyrick
            So in your MWBC's, I take it you share neutrals with lighting and receptacles then?
            Not trying to answer for Hardworkingstiff, but unless there was some special circumstances there would be no reason not to if the lighting was 120v.

            Roger
            Moderator

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              #7
              And I would as well if it circumstances allowed. :smile:

              Comment


                #8
                I use MWBC's whenever possible. That would include lighting and receptacles if the voltage was only 208Y/120.
                Rob

                Moderator

                All responses based on the 2017 NEC unless otherwise noted

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                  #9
                  I think I just found something to add to the FAQ.

                  Do a search for "shared neutrals" and you'll hit pay-dirt.

                  Check out my favorite related thread, with 145 replies.

                  Comment


                    #10
                    The only commercial work I've done was a "Just replace whatever was there before" job and it had shared neutrals like nobody's business. At first they looked weird. Now whenever I think I'd like more than 1 20A circuit to go somewhere, I think a MWBC might be a nice idea.
                    Julie in Austin

                    Born to brew, forced to work ...

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                      #11
                      Julie, I agree. MWBC's are electrically (voltage drop, etc.) and mechanically (labor and KO usage) more efficient. The concern expressed is that MWBC's should be all-receptacle or all-lighting, and not mixed.

                      Theoretically it should not matter, but if practical, I like keeping them separate for performance's sake, phase count aside. While lighting can also affect lighting, it seems that receptacle loads "shouldn't" affect lighting.

                      The biggest concern for MWBC's is that it's the one configuration where a poor connection in the neutral pathway can result in over-voltage problems on adjoining circuits. Added: Besides, my mom taught me to share.
                      Last edited by LarryFine; 02-17-07, 10:37 PM.
                      Master Electrician
                      Electrical Contractor
                      Richmond, VA

                      Comment


                        #12
                        All services have what is termed a "shared neutral"

                        What's good for the goose is good for the gander .... :grin:

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