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Thread: metal 4"Sq. box

  1. #1
    Join Date
    Apr 2009
    Location
    Manchester, Vermont
    Posts
    298

    Question metal 4"Sq. box

    The NEC code book 2008 edition.

    Can a 4"Sq, x 1-1/2" box extension ring be added to an existing
    4"Sq. x 2-1/8" deep box.

    When finish, I will be installing a 4"Sq., 2 gang, 1" raise, plaster ring so I
    can install two switches inside this box. (note: when finish this box will
    be cover with sheetrock, expect, the open front, which is where the
    switches will be visible.)

    Does the NEC allow or probibit this practice?

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  2. #2
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,246

    Default Re: metal 4"Sq. box

    Quote Originally Posted by Robert S. Mattison View Post
    The NEC code book 2008 edition.

    Can a 4"Sq, x 1-1/2" box extension ring be added to an existing
    4"Sq. x 2-1/8" deep box.

    When finish, I will be installing a 4"Sq., 2 gang, 1" raise, plaster ring so I
    can install two switches inside this box. (note: when finish this box will
    be cover with sheetrock, expect, the open front, which is where the
    switches will be visible.)

    Does the NEC allow or probibit this practice?

    Robert,

    The NEC will not prohibit you from doing that, but the 2x4 studs, which are only 3-1/2" deep, will prohibit you from doing that.

    *IF* you have *NO* protrusions out the back side of the box (you likely will have) then the box and extension ring will be 3-5/8" deep ... in a 3-1/2" deep wall ... ... and then the screws out the back of the box ...

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
    Join Date
    Apr 2009
    Location
    Manchester, Vermont
    Posts
    298

    Default Re: metal 4"Sq. box

    A big thanks, to you Jerry, with your answer.

    When I have a problem, its nice to know, that there people like you
    involved with this Form, that can quickly supply the answer I needed.

    But what I really like about you, is you go to great lengths to supply a detail answer.

    Last edited by Robert Mattison; 09-11-2009 at 02:06 PM. Reason: spelling mistake

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