Q> for all your Electrical code guys

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  • LCHIEN
    Internet Fact Checker
    • Dec 2002
    • 20920
    • Katy, TX, USA.
    • BT3000 vintage 1999

    Q> for all your Electrical code guys

    We had a new cooktop intalled last week, they replaced an existing cooktop and wired to the existing junction box under the island.

    Does this look right? Would it pass NEC code or does it need some strain relief on the silver flex conduit?

    Anyway, a couple of extra pics of the new cooktop and its all-electronic touch-control panel. Should be a whole lot easier to keep clean.
    Attached Files
    Last edited by LCHIEN; 04-24-2011, 05:39 PM.
    Loring in Katy, TX USA
    If your only tool is a hammer, you tend to treat all problems as if they were nails.
    BT3 FAQ - https://www.sawdustzone.org/forum/di...sked-questions
  • BobSch
    • Aug 2004
    • 4385
    • Minneapolis, MN, USA.
    • BT3100

    #2
    Definitely needs a strain relief.

    Like this.





    They should have them at the BORG.
    Bob

    Bad decisions make good stories.

    Comment

    • RAFlorida
      Veteran Member
      • Apr 2008
      • 1179
      • Green Swamp in Central Florida. Gator property!
      • Ryobi BT3000

      #3
      Would not pass any code.

      Needs a straight Greenfield connector on it.

      Comment

      • Stytooner
        Roll Tide RIP Lee
        • Dec 2002
        • 4301
        • Robertsdale, AL, USA.
        • BT3100

        #4
        Not sure if that box is rated for that either. I was under the impression that such a fixture was only for lighting and not junction.
        That said, I have seen many used the very same way as the picture. That still doesn't make it right.
        Another reason you want the holes filled with strain relief is arc containment. Plastic boxes do a bad job of that, but I don't know that they are used much for junctions either.
        This is just some impressions I gathered from working with electrical and recently reading a how to book on wiring in an effort to keep my new shop up to code.
        The old one certainly isn't.
        Lee

        Comment

        • cabinetman
          Gone but not Forgotten RIP
          • Jun 2006
          • 15218
          • So. Florida
          • Delta

          #5
          Originally posted by BobSch
          Definitely needs a strain relief.

          Like this.





          They should have them at the BORG.
          +1. Hard to believe a qualified electrician would leave a connection like that.

          .

          Comment

          • atgcpaul
            Veteran Member
            • Aug 2003
            • 4055
            • Maryland
            • Grizzly 1023SLX

            #6
            Problem with fixing it is you have to undo all the connections in the box first. I wonder if they didn't put in the collar because the armored cable wasn't long enough to reach the box. In any case, I would have them back in to fix it.

            Comment

            • LCHIEN
              Internet Fact Checker
              • Dec 2002
              • 20920
              • Katy, TX, USA.
              • BT3000 vintage 1999

              #7
              A greenfield connector sounds right, and looks like this



              I take it I thread the end of the flex conduit onto the Greenfield connector then place the greenfield connector into the box and thread on the lock nut.

              Here's another type, clamps to the outside.



              Probably the guys didn't have one and didn't want to go get one. Like Paul says, now I have to pull off the cover, break all the connections and put the connector on and then redo all the connections. I could do it but heck, I paid the guys to do it. I guess I'll pick up the connector and then call them to come back.

              And I had to look up anti-short bushing:



              thanks all-thumbs and woodturner.
              Last edited by LCHIEN; 04-25-2011, 06:15 PM.
              Loring in Katy, TX USA
              If your only tool is a hammer, you tend to treat all problems as if they were nails.
              BT3 FAQ - https://www.sawdustzone.org/forum/di...sked-questions

              Comment

              • jdon
                Established Member
                • Feb 2010
                • 401
                • Snoqualmie, Wash.
                • BT3100

                #8
                Just to add my 0.02-

                Last week I replaced a wall oven, which also had flexible metal conduit to connect (as did the old wall oven). The conduit connected to the box by way of a clamp that fit over the outside of the end of the conduit- similar to the lower picture you posted. The inner surfaces of the clamp had slanted projections ("threads") which matched the grooves of the conduit, providing a very secure connection when the the screws on the ears on the sides of the clamp were tightened. The only difference was that my clamp had a 90 degree bend, and entered the box through the knockout in the cover plate.

                That clamp seems to me preferable to the top clamp you pictured, which threads inside the conduit- narrowing the passage for the conductors.

                Comment

                • All Thumbs
                  Established Member
                  • Oct 2009
                  • 322
                  • Penn Hills, PA
                  • BT3K/Saw-Stop

                  #9
                  Just a note that you may be also required (by code) to have a red anti-short bushing, depending on the type of cable (AC vs. MC) and termination you use.

                  Comment

                  • woodturner
                    Veteran Member
                    • Jun 2008
                    • 2047
                    • Western Pennsylvania
                    • General, Sears 21829, BT3100

                    #10
                    Originally posted by LCHIEN
                    Would it pass NEC code or does it need some strain relief on the silver flex conduit?
                    Good advice posted already, but just to confirm:
                    1. Box is fine, as long as the fill is within spec limits (there really aren't "special" boxes - any box that is within fill limit is fine as a junction box).
                    2. Use an anti-shorting sleeve.
                    3. Use a cable connector.
                    --------------------------------------------------
                    Electrical Engineer by day, Woodworker by night

                    Comment

                    • Stytooner
                      Roll Tide RIP Lee
                      • Dec 2002
                      • 4301
                      • Robertsdale, AL, USA.
                      • BT3100

                      #11
                      I thought I might of misread or misinterpreted that section in the book. There are rules for junction boxes, but as noted, they relate to the amount and type of connections for a given sized box.
                      Lee

                      Comment

                      • scmhogg
                        Veteran Member
                        • Jan 2003
                        • 1839
                        • Simi Valley, CA, USA.
                        • BT3000

                        #12
                        Loring,

                        I am green with envy. I lust after one of those induction tops. Nice selection of AllClad pots and pans to go with it. I have the pots, I just need the top.

                        Steve
                        I would never die for my beliefs because I might be wrong. Bertrand Russell

                        Comment

                        • master53yoda
                          Established Member
                          • Oct 2008
                          • 456
                          • Spokane Washington
                          • bt 3000 2 of them and a shopsmith ( but not for the tablesaw part)

                          #13
                          I would call the installer and tell them to com back out and do it right. Over time you will get wire damage where it enters the box.
                          Art

                          If you don't want to know, Don't ask

                          If I could come back as anyone one in history, It would be the man I could have been and wasn't....

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