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Thread: Multiwire Branch Ciruits

  1. #11
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    Quote Originally Posted by Ondarc View Post
    Just a quick question, any input is welcome and very much appreciated. When and how is it legal according to the 2017 NEC to use 12/3 NM-B cable for multiple receptacle or lighting circuits in a residential setting?
    Thanks.
    You might also want to consider using either 12/2/2 or 14/2/2 NM for this type of installation. You have two separate circuits but only one cable/homerun.
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    My Boss is a Tyrant and my Employee is an Idiot.

  2. #12
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    Quote Originally Posted by Ondarc View Post
    Just a quick question, any input is welcome and very much appreciated. When and how is it legal according to the 2017 NEC to use 12/3 NM-B cable for multiple receptacle or lighting circuits in a residential setting?
    Thanks.
    You might also want to consider using either 12/2/2 or 14/2/2 NM for this type of installation. You have two separate circuits but only one cable/homerun.
    Norb
    My Boss is a Tyrant and my Employee is an Idiot.

  3. #13
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    Quote Originally Posted by 1793 View Post
    You might also want to consider using either 12/2/2 or 14/2/2 NM for this type of installation. You have two separate circuits but only one cable/homerun.
    You save one ground wire!

  4. #14
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    Quote Originally Posted by Sierrasparky View Post
    You save one ground wire!
    That is another benefit. I use these cables quite a bit on remodels and room additions.
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    My Boss is a Tyrant and my Employee is an Idiot.

  5. #15
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    Quote Originally Posted by 1793 View Post
    That is another benefit. I use these cables quite a bit on remodels and room additions.
    Do you see that big of a labor or material savings? That stuff is about 45% more in cost.
    I see the use for heat fans and such that have multiple switch legs.

  6. #16
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    Quote Originally Posted by GoldDigger View Post
    Maybe the residence in question is off-grid?
    Residences in Florida and several US territories went off grid, after recent hurricanes.

    710.15(C) prohibits MWBC's for "Stand-Alone Systems" preferred in off-grid areas.

    WARNING:
    SINGLE 120-VOLT SUPPLY. DO NOT CONNECT MULTI‐
    WIRE BRANCH CIRCUITS!
    The warning sign(s) or label(s) shall comply with 110.21(B).
    Roger Ramjet NoFixNoPay

  7. #17
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    Quote Originally Posted by ramsy View Post
    Residences in Florida and several US territories went off grid, after recent hurricanes.

    710.15(C) prohibits MWBC's for "Stand-Alone Systems" preferred in off-grid areas.

    WARNING:
    SINGLE 120-VOLT SUPPLY. DO NOT CONNECT MULTI‐
    WIRE BRANCH CIRCUITS!
    The warning sign(s) or label(s) shall comply with 110.21(B).
    I don't think the OP being in New York is concerned about off grid applications. I could be mistaken.

  8. #18
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    Quote Originally Posted by flatlander View Post
    I don't think the OP being in New York is concerned about off grid applications. I could be mistaken.
    Whats A-Matter You, Why You Looka So Sad, It's A-Not So Bad, just because this topic is relevant to Residential "Stand-Alone Systems" that are installed everywhere, not just Off-Grid areas.
    Last edited by ramsy; 09-14-17 at 01:11 PM.
    Roger Ramjet NoFixNoPay

  9. #19
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    Quote Originally Posted by ramsy View Post
    Whats A-Matter You, Why You Looka So Sad, It's A-Not So Bad, just because this topic is relevant to Residential "Stand-Alone Systems" that are installed everywhere, not just Off-Grid areas.

    I so sorry did I hurt your feelings

  10. #20
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    Oct 2015
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    With the op being from NYC your only allowed to uses NM in residential buildings 3 stories or less

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