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Thread: Rigid conduit repair

  1. #1

    Rigid conduit repair

    I have a customer that wants me to repair a 4" rigid metallic conduit that was improperly supported under an I beam bridge. The conduit was hit and broke at the coupling. I would love to remove the wires from the conduit and install an erickson, but this would shut down vital equipment and be very costly and extensive so the customer has asked me if there is a way to repair the conduit without a shut down. I know that OZ Gedney and Appelton makes a fitting that will clamp over the conduit, but not without removing the conductors. I have researched through suppliers and Googled with nno luck so this is my last attempt before I inform the customer of the bad news. Any ideas for a professional and durable repair will greatly be appreciated! Thanks...

  2. #2
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    well it wouldn't be code compliant but i suppose you could use a band clamp. or sched a shutdown...

  3. #3
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    I don't think this is listed but I have seen it used to that purpose.
    Don, Illinois
    "It is the first responsibility of every citizen to question authority." B Franklin

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  5. #5
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    Quote Originally Posted by jusme123 View Post
    I also thought of a split coupling, but it will not work to replace a damaged rigid coupling with the conductors remaining in the conduit.
    The coupling is split not hindged. You will not be able to spread it apart enough without damaging the new split coupling.
    Tim
    Master Electrician
    New England
    Yesterday's Technology at Tomorrow's Prices

    Answers based on 2011 NEC

  6. #6
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    I am somewhat impressed they hit the conduit hard enough to break a 4" RMC coupling but did not damage the conductors.

  7. #7
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    Quote Originally Posted by iwire View Post
    I am somewhat impressed they hit the conduit hard enough to break a 4" RMC coupling but did not damage the conductors.
    .....normally the conduit will break at the threads, due to the fact that the conduit wall is 'thinned' by the threading of the conduit.

  8. #8
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    Quote Originally Posted by lu302dan View Post
    I have a customer that wants me to repair a 4" rigid metallic conduit that was improperly supported under an I beam bridge. The conduit was hit and broke at the coupling. I would love to remove the wires from the conduit and install an erickson, but this would shut down vital equipment and be very costly and extensive so the customer has asked me if there is a way to repair the conduit without a shut down. I know that OZ Gedney and Appelton makes a fitting that will clamp over the conduit, but not without removing the conductors. I have researched through suppliers and Googled with nno luck so this is my last attempt before I inform the customer of the bad news. Any ideas for a professional and durable repair will greatly be appreciated! Thanks...
    This is probably what you’re looking for, but I have no idea who stocks them.
    http://www.hubbellonline.com/wiring/...ll/pdf/b29.pdf

  9. #9
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    Quote Originally Posted by don_resqcapt19 View Post
    I don't think this is listed but I have seen it used to that purpose.
    Likewise with this one:

    http://www.innerduct.com/products/co...round_coupling

    I'll never get there. No matter where I go, I'm always here.

  10. #10
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    I don't see any way to use a one piece split coupling to make this repair. The one I linked to, is a two piece and will be stronger than the original coupling. I would ask the inspector to use 90.4 to permit the repair with the two piece split conduit. It comes in 10' lengths, just cut it in half and bolt the two sections on the conduit centered on the old coupling. The hardest part would be removing the only threaded coupling. You can split it with a saw being careful not to cut too deep into the existing conduit. I would not remove the only coupling unless the conductors were locked out. You will have to check and make sure there is no damage to the conduit that has left sharp points that will damage the conductors after the repair.
    Don, Illinois
    "It is the first responsibility of every citizen to question authority." B Franklin

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