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Conduit Supports in a Wet Location

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    Conduit Supports in a Wet Location

    I was always told while running conduit outdoors, on a wall, a 1/2" space was needed behind the conduit. That's why backstraps or minis were used. I can't find this in the NEC. Is this requirement of the NEC or a trade practice?

    #2
    It is not in the nec afaik...
    They say I shot a man named Gray and took his wife to Italy
    She inherited a million bucks and when she died it came to me
    I can't help it if I'm lucky

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      #3
      Originally posted by Dennis Alwon View Post
      It is not in the nec afaik...
      I thought it used to be, ... 70's? 80's? But it was worded that you only needed it on horizontal runs, not vertical. That's the way I remember it.

      Comment


        #4
        Originally posted by oldsparky52 View Post

        I thought it used to be, ... 70's? 80's? But it was worded that you only needed it on horizontal runs, not vertical. That's the way I remember it.
        I don't ever recall it being in the nec but early 70-80's I wouldn't know. I see it done with strut but usually only when there are multiple runs.
        They say I shot a man named Gray and took his wife to Italy
        She inherited a million bucks and when she died it came to me
        I can't help it if I'm lucky

        Comment


          #5
          There is this for indoor
          300.6
          (D) IndoorWet Locations. In portions of dairy processing
          facilities, laundries, canneries, and other indoor wet locations,
          and in locations where walls are frequently washed or
          where there are surfaces of absorbent materials, such as
          damp paper or wood, the entire wiring system, where installed
          exposed, including all boxes, fittings, raceways, and
          cable used therewith, shall be mounted so that there is at
          least a 6-mm (1⁄4-in.) airspace between it and the wall or
          supporting surface.
          The more they overthink the plumbing, the easier it is to stop up the drain

          Comment


            #6
            Originally posted by dkidd View Post
            There is this for indoor
            300.6
            (D) IndoorWet Locations. In portions of dairy processing
            facilities, laundries, canneries, and other indoor wet locations,
            and in locations where walls are frequently washed or
            where there are surfaces of absorbent materials, such as
            damp paper or wood, the entire wiring system, where installed
            exposed, including all boxes, fittings, raceways, and
            cable used therewith, shall be mounted so that there is at
            least a 6-mm (1⁄4-in.) airspace between it and the wall or
            supporting surface.
            Good find-- that must be what he remembers-- I did not know about this section .
            They say I shot a man named Gray and took his wife to Italy
            She inherited a million bucks and when she died it came to me
            I can't help it if I'm lucky

            Comment


              #7
              Originally posted by Dennis Alwon View Post

              Good find-- that must be what he remembers--
              Yes, good find! and... probably.

              Comment


                #8
                The 1 ∕ 4" airspace is also required for enclosures covered under Article 312 in damp and wet locations but not the raceways.
                Rob

                Moderator

                All responses based on the 2017 NEC unless otherwise noted

                Comment


                  #9
                  I remember it also although I never use 1 hole straps anyway for running outdoor conduit with compression couplings. The standoff of the coupling and using 1 hole straps just makes the run look bad.

                  That's also why the mounting nubs on most all 3r enclosures protrude out about 1/4".

                  JAP>

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