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Thread: 210.25 as it applies to Dorm. Dwelling Unit

  1. #1
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    210.25 as it applies to Dorm. Dwelling Unit

    210.25 says that branch circuits from a dwelling unit shall supply only loads within that dwelling unit.

    Well this dwelling unit has 2 means of egress and qualifies for emergency egress lighting (as far as I can make sense of the bldg code).

    I just want to make sure that I can still bring in an emergency circuit from outside the dwelling unit (basement where emerg. panel is) into the dwelling unit for the emerg. egress lights and that this is ok.

    This is a dormitory setup type building, with only one meter for the building, but the dwelling unit/apartment is separated from the other "boarding" areas and has its own panelboard.

    Thank you

  2. #2
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    Quote Originally Posted by Designer69 View Post
    210.25 says that branch circuits from a dwelling unit shall supply only loads within that dwelling unit.

    Well this dwelling unit has 2 means of egress and qualifies for emergency egress lighting (as far as I can make sense of the bldg code).

    I just want to make sure that I can still bring in an emergency circuit from outside the dwelling unit (basement where emerg. panel is) into the dwelling unit for the emerg. egress lights and that this is ok.

    This is a dormitory setup type building, with only one meter for the building, but the dwelling unit/apartment is separated from the other "boarding" areas and has its own panelboard.

    Thank you
    Does this dorm room actually meet the NEC definition of "dwelling unit"?

  3. #3
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    Yes I would say it does.

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  4. #4
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    Quote Originally Posted by Designer69 View Post
    Yes I would say it does.

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    More details are needed. In my state "permanent provisions for cooking" means a range or a permanent cook top. Microwaves are not considered as permanent provisions for cooking. A shared bathroom may also change things as then it may not be considered a "single unit" or "independent". A call to the AHJ may be helpful.
    Last edited by packersparky; 05-16-18 at 11:03 PM.

  5. #5
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    yes it is definitely a dwelling unit, with electric range and all.

    So going back to the initial question... is it allowable to run an emerg. circuit from the basement emerg. panelboard into this dwelling unit to supply the emerg. egress lights and without violating 210.25?


    I would think this is acceptable sinc 210.25 only seems to require not supplying outside loads from the dwelling unit, but not vise versa.

    Just want to make sure I'm not misinterpreting.

  6. #6
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    Quote Originally Posted by Designer69 View Post
    yes it is definitely a dwelling unit, with electric range and all.

    So going back to the initial question... is it allowable to run an emerg. circuit from the basement emerg. panelboard into this dwelling unit to supply the emerg. egress lights and without violating 210.25?


    I would think this is acceptable sinc 210.25 only seems to require not supplying outside loads from the dwelling unit, but not vise versa.

    Just want to make sure I'm not misinterpreting.
    That is how I see it

    210.25 says that branch circuits from a dwelling unit shall supply only loads within that dwelling unit.
    Plus it is also followed with

    or loads associated only with that dwelling unit.
    Your "emergency circuit" is likely associated with more then just loads in "that dwelling unit".
    I live for today, I'm just a day behind.

  7. #7
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    Quote Originally Posted by kwired View Post
    That is how I see it

    Plus it is also followed with



    Your "emergency circuit" is likely associated with more then just loads in "that dwelling unit".
    It doesn't say "from each dwelling unit" it says "in each dwelling unit". IMO this does not mean that you cannot supply the EM lights form a panel remote form the dwelling unit, but once that branch circuit enters the dwelling unit, you cannot supply other loads that are not in the dwelling unit or loads that are not associated with that dwelling unit with that branch circuit.

    (A) Dwelling Unit Branch Circuits. Branch circuits in each
    dwelling unit shall supply only loads within that dwelling unit
    or loads associated only with that dwelling unit.

  8. #8
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    Quote Originally Posted by packersparky View Post
    It doesn't say "from each dwelling unit" it says "in each dwelling unit". IMO this does not mean that you cannot supply the EM lights form a panel remote form the dwelling unit, but once that branch circuit enters the dwelling unit, you cannot supply other loads that are not in the dwelling unit or loads that are not associated with that dwelling unit with that branch circuit.

    (A) Dwelling Unit Branch Circuits. Branch circuits in each
    dwelling unit shall supply only loads within that dwelling unit
    or loads associated only with that dwelling unit.
    I quoted
    210.25 says that branch circuits from a dwelling unit shall supply only loads within that dwelling unit.
    from your OP and sort of missed that difference when reading from code.

    Seem to have answered your own question now that you said that.

    Unless someone finds other wording I think you need to run a feeder from emergency system to the dwelling unit and then install branch circuit off that to your egress lighting within the unit.
    I live for today, I'm just a day behind.

  9. #9
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    Quote Originally Posted by kwired View Post
    I quoted from your OP and sort of missed that difference when reading from code.

    Seem to have answered your own question now that you said that.

    Unless someone finds other wording I think you need to run a feeder from emergency system to the dwelling unit and then install branch circuit off that to your egress lighting within the unit.
    I'm not the OP.

  10. #10
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    Quote Originally Posted by packersparky View Post
    I'm not the OP.
    Oops, don't know why I thought you were. Still stand by most of what was said though.
    I live for today, I'm just a day behind.

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