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Thread: URD direct burial to from house to outbuilding

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    URD direct burial to from house to outbuilding

    I happened upon this installation. URD with a separate THHW conductor are direct buried in a trench to an outbuilding with a main panel inside the structure. Is this the best option? Is there a USE cable with four conductors available for this situation?
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    The THWN is fine if that is conduit all the way, but not for DB as you've indicated. I've buried a separate USE bundled up with the triplex on occasion

    Yes, they make a 4 wire version of what you have but you may need to remark the cable to indicate the EG and Neutral.
    Tom
    TBLO

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    Note: URD is not an approved NEC wiring method but your picture indicates at least one of the conductors is USE-2 which is approved for direct burial and for use in a conduit.
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

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    Quote Originally Posted by augie47 View Post
    Note: URD is not an approved NEC wiring method but your picture indicates at least one of the conductors is USE-2 which is approved for direct burial and for use in a conduit.
    That is a common cabling and marking for the triplex he has pictured. The THWN is the oddball.
    Tom
    TBLO

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    Quote Originally Posted by ptonsparky View Post
    That is a common cabling and marking for the triplex he has pictured. The THWN is the oddball.
    agreed.. I just noticed he referenced it as "URD" and wated to make sure he realized it also had an acceptable rating
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

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    Since the EGC can (in most cases) be bare copper and still be direct buried, I have no issue with using copper THWN for the EGC here.

    I know some will probably disagree.

    If that green conductor is aluminum, I say it needs direct burial rated insulation.
    I live for today, I'm just a day behind.

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    Quote Originally Posted by kwired View Post
    Since the EGC can (in most cases) be bare copper and still be direct buried, I have no issue with using copper THWN for the EGC here.
    I agree.

    If a GEC can be bare, I don't know why an EGC can't be buried THWN.

    4 wire mobile home feeder may have been a simpler choice for this installation, but I don't know the circumstances.

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    Quote Originally Posted by Cow View Post

    4 wire mobile home feeder may have been a simpler choice for this installation, but I don't know the circumstances.
    Around here, SH's did not stock 4/wire until 15-20 years ago (because "nobody bought it", self-fulfilling statement), so I have seen and done similar installations
    Dave Ruth

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