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Help on 2011 NEC 230.2

Discussion in 'Electrical Codes' started by bkelly, Jun 17, 2016.

  1. bkelly

    bkelly Registered User

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    I have been an electrician for 40 years and a Building Official for 10 years, and 230.2 still confuses me. I have a project, multi-family apartment with10 buildings. Each building has 11 apartments. There are no firewalls in these buildings. At the end of each building is a pad mount xfmr, there are 2 service laterals to the building in the same location. On the building each of the 2 laterals terminate in a tap box. The 2 tap boxes are side by side. 1 tap box feeds a 6 meter pack with 6 individual 100 a breakers. The other tap box is the same set up, with 5 meter packs. I count 11 movements to disconnect power to the building. The engineer cites 230.40 Ex. 1 as allowing this. Am I missing something?

    Buck
     
  2. cda

    cda Sawhorse

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    Welcome!!

    It is Friday give them a business day or two to answer
     
  3. cda

    cda Sawhorse

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    Are you

    In the North Texas state
    Or

    South Texas state ??
     
  4. north star

    north star Sawhorse

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    # ~ #


    Buck,

    Welcome to The Building Codes Forum ! :cool:

    Ask your engineer to [ please ] define occupancy from the applicable
    building code.........Me thinks that your engineer is misconstruing occupancies
    for "occupants".

    In all seriousness Buck, ...please take the time to courteously educate your
    engineer on Bldg. Occupancies types........Show `em that a Building Official
    has some valuable knowledge.



    # ~ #
     
    cda likes this.
  5. chris kennedy

    chris kennedy Sawhorse

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    This is interesting indeed. Before I start with def's from NEC, IBC, and MW the key to your question is in this statement.

    How are there no fire walls/partitions between dwelling units???
     
  6. cda

    cda Sawhorse

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    Ceiling is the top of the rated envelope???
     
  7. cda

    cda Sawhorse

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    Buellar
     
    #7 cda, Jun 19, 2016
    Last edited: Jun 20, 2016
  8. Francis Vineyard

    Francis Vineyard Registered User

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    Based on the 2011 NEC (new underlined);

    230.40 Number of Service-Entrance Conductor Sets.

    Each service drop, set of overhead service conductors, set
    of underground service conductors, or service lateral shall
    supply only one set of service-entrance conductors.

    Exception No. 1: A building with more than one occupancy
    shall be permitted to have one set of serviceentrance
    conductors for each service, as defined in 230.2,
    run to each occupancy or group of occupancies. If the
    number of service disconnect locations for any given classification
    of service does not exceed six, the requirements of
    230.2(E) shall apply at each location. If the number of
    service disconnect locations exceeds six for any given supply
    classification, all service disconnect locations for all
    supply characteristics, together with any branch circuit or
    feeder supply sources, if applicable, shall be clearly described
    using suitable graphics or text, or both, on one or
    more plaques located in an approved, readily accessible
    location(s) on the building or structure served and as near
    as practicable to the point(s) of attachment or entry(ies) for
    each service drop or service lateral, and for each set of
    overhead or underground service conductors.



    230.71 Maximum Number of Disconnects.


    (A) General.
    The service disconnecting means for each service
    permitted by 230.2, or for each set of service-entrance
    conductors permitted by 230.40, Exception No. 1, 3, 4, or 5,
    shall consist of not more than six switches or sets of circuit
    breakers, or a combination of not more than six switches and
    sets of circuit breakers, mounted in a single enclosure, in a
    group of separate enclosures, or in or on a switchboard. There
    shall be not more than six sets of disconnects per service
    grouped in any one location.
    For the purpose of this section, disconnecting means
    installed as part of listed equipment and used solely for the
    following shall not be considered a service disconnecting
    means:

    (1) Power monitoring equipment
    (2) Surge-protective device(s)
    (3) Control circuit of the ground-fault protection system
    (4) Power-operable service disconnecting means


    230.2 (E) Identification. Where a building or structure is supplied
    by more than one service, or any combination of
    branch circuits, feeders, and services, a permanent plaque
    or directory shall be installed at each service disconnect
    location denoting all other services, feeders, and branch
    circuits supplying that building or structure and the area
    served by each. See 225.37.


     
  9. cda

    cda Sawhorse

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    So do the replies help??
     
  10. Filthy McNasty

    Filthy McNasty Registered User

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    I believe what you are describing is more than one service for the building. So you have two. That would be "12 moves of the hand" and be code compliant. It is 6 moves of the hand per allowed service.

    When there is more than one service on a building (if the AHJ allows more than one, for a given situation), then the requirements of 230.2(E) kick in. EACH service must have a sign and note the location of the other service. This is where most electrical contractors get confused (and inspectors as well). The signage has to be worded properly to conform to 230.2(E). I've seen jobs passed where someone took a marker and wrote on one service "1 of 2" and on the second "2 of 2" and that was it. This would NOT comply with 230.2(E). Read over 230.2(E),

    Hope this helps.
     
  11. Julian Sanchez

    Julian Sanchez Registered User

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    Good evening,

    In my case I have an apartment building where city utilities company in Jonesboro AR removed a couple of the meters.

    City inspector says that I have to add now a disconnect means to those for the utility company to reinstall meters, question is where in the code does it specify what type of disconnect needs to be? these are for 1 bedroom apartments with 100A panels
     
  12. Rick18071

    Rick18071 Sawhorse

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    Maybe this is an utility requirement?
     

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