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Thread: 4" box inside threaded Hubs

  1. #1
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    4" box inside threaded Hubs

    If you were reading this spec section for boxes would you interpret it and include inside threaded boxed for any RGS or would you say you can use pressed steel for RGS as well? Have a lot of RGS indoors.

    2.4 OUTLET, JUNCTION AND PULL BOXES
    A. Cast Type Conduit Boxes, Outlet Bodies, and Fittings
    1. For rigid steel conduit, ferrous alloy box with inside threaded hubs.
    2. For rigid aluminum conduit, aluminum box with inside threaded hubs.
    3. For electrical metallic tubing, ferrous alloy box with compression or inside threaded hubs
    with adapter.
    4. Covers: Cast or sheet metal unless otherwise required.
    5. Tapered threads for hubs.


    B. Galvanized Pressed Steel Outlet Boxes
    1. General: Pressed steel, galvanized or cadmium-
    plated, minimum of 4” octagonal or
    square with galvanized cover or extension ring as required.
    2. Concrete Box: 4" octagon with removable backplate and 3/8" fixture stud, if required.
    Depth of box shall allow for a minimum of 1" of concrete to be poured above the
    backplate.
    3. Switch and Receptacle Box, Indoors: Nominal 4" square, 1½" or 2-1/8" deep as required,
    with raised cover unless otherwise indicated on the Contract Documents.
    4. Lighting Fixture Box:
    a. 4" octagon with 3/8" fixture stud.
    b. For suspended ceiling work, 4" octagon with removable backplate where required,
    and two (2) parallel bars for securing to cross-furring channels and extend flexible
    metal conduit to each fixture.

  2. #2
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    what do they mean by inside threaded?
    Bob

  3. #3
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    For "A" you'll need boxes with threaded hubs.
    For "B" post #2 in your other thread has you covered for 2 & 4. 1 & 3 are standard 1900 boxes.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  4. #4
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    Quote Originally Posted by infinity View Post
    For "A" you'll need boxes with threaded hubs.
    For "B" post #2 in your other thread has you covered for 2 & 4. 1 & 3 are standard 1900 boxes.
    Thanks. What I'm asking is your interpretation that is using RGS you have to follow A(threaded hub boxes) or could you use boxes listed in B for RGS?

  5. #5
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    Oct 2013
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    newburgh,ny
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    Incomplete specs

    As far as I can see that is an incomlplete spec.

    I would think it should read Part A for outside work Part B for inside work.

    Part A they want FS type boxes.
    Part B standard.
    A cowboy may get thrown , but they always get up and walk forward.

  6. #6
    Join Date
    Jul 2005
    Posts
    705
    The way that is written, pressed steel can only be used for EMT

    Is most of your RGS work to be surface mount?

    Are they allowing EMT in furred walls?

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