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Thread: concrete tight ok underground?

  1. #11
    Join Date
    Jul 2003
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    New Jersey
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    25,857
    I would just use a fitting that is designed for RMC. According to 300.6(A)(3) all that required of the fitting is that it has corrosion protection. There are some already referenced in this thread. As far as being watertight it's not required for RMC underground.

    300.6(A)(3) In Concrete or in Direct Contact with the Earth.
    Ferrous metal raceways, cable armor, boxes, cable sheath-
    ing, cabinets, elbows, couplings, nipples, fittings, supports,
    and support hardware shall be permitted to be installed in
    concrete or in direct contact with the earth, or in areas
    subject to severe corrosive influences where made of mate-
    rial approved for the condition, or where provided with
    corrosion protection approved for the condition.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  2. #12
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    Mar 2003
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    New York
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    1,244
    Kwired
    Too much work for me with a drill or breaker bar; I would thread out of the ditch. LOL! Besides hard to turn those long sweeps the POCO demands.
    If I had to turn a 90 on in the ditch I would brace the pipe run until it came out of the ground where I could spin it on; or if only one 90 start at the 90 and work both ways, backhoe comes in handy.

  3. #13
    Join Date
    Mar 2003
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    Vermont
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    could you go pvc on out sameguy?

    ~RJ~

  4. #14
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    Mar 2003
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    Not my job, GerryB is the op; so pvc?.

  5. #15
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    Sep 2011
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    woodbridge, ct. USA
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    1,117
    Quote Originally Posted by sameguy View Post
    Not my job, GerryB is the op; so pvc?.
    No PVC, POCO wants rigid all the way because it is a driveway. (They don't care how deep it is). Although I have a question now as I actually don't see that in their guidebook. Will have to question this engineer.

  6. #16
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    Mar 2003
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    New York
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    If you can build it above ground then drag it into the ditch.

  7. #17
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    Dec 2007
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    NE Nebraska
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    Quote Originally Posted by sameguy View Post
    If you can build it above ground then drag it into the ditch.
    Dragging 10 feet at a time sounds like a big enough task when you are talking 4 inch RMC.

    Is one 10 foot piece of 4 inch still called a "stick"?
    I live for today, I'm just a day behind.

  8. #18
    Join Date
    Dec 2012
    Location
    Placerville, CA, USA
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    Quote Originally Posted by kwired View Post
    Dragging 10 feet at a time sounds like a big enough task when you are talking 4 inch RMC.

    Is one 10 foot piece of 4 inch still called a "stick"?
    Maybe a "tree trunk"?

  9. #19
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    Mar 2003
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    New York
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    Quote Originally Posted by kwired View Post
    Dragging 10 feet at a time sounds like a big enough task when you are talking 4 inch RMC.

    Is one 10 foot piece of 4 inch still called a "stick"?
    Stick yes, try bending a 30 on each end of a 10' stick then screw a 10 footer on to it, then add another 10' 30deg. Offset to the other two! Crossing a small stream, two runs next day I couldn't lift my arms over my nipples! My partner was 5'4" I'm 6'1+ used a backhoe to help screw it together and set them.

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