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  1. #1
    Join Date
    Apr 2009
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    Manchester, Vermont
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    Cool netural/ground or grounding conductor

    Panel in an out building feed by a URD 4-wire cable.

    2-Hot conductors, ie., L1 & L2, / 1 ground/netural conductor / 1 grounding conductor

    correctly if I am wrong, but the ground rods grounding conductor is not
    to be bonded to the ground/netural in this type of panel. But should
    be bonding to the incoming grounding conductor.

    Also found the panel bond, is still connected to the netural/ground buss bar. THANKS. p.s. there is a 100 amp. 2-pole main breaker disconnect
    for the whole panel.

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  2. #2
    Join Date
    Feb 2009
    Location
    Southern Vancouver Island
    Posts
    4,546

    Default Re: netural/ground or grounding conductor

    Yes the bonding screw or strap should be removed from the neutral bus.
    Yes, the grounding conductor from the ground rod goes only to a terminal block on the panel box, as does the incoming ground.
    All the circuit grounds go to a terminal strip mounted on the panel box, and only circuit neutrals go to the neutral bus.

    If not installed correctly, it is amateur work and there may be other defects. Is the feed from the main breaker panel sized correctly for 100 amps?

    John Kogel, RHI, BC HI Lic #47455
    www.allsafehome.ca

  3. #3
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    Apr 2009
    Location
    Manchester, Vermont
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    298

    Wink Re: netural/ground or grounding conductor

    John K. the panel in the out building is a 20 1" space QO SD panel.

    The panel main breaker is rated 100 amps.

    The URD cable is 4 - conductor, size #2

    The house panel is QO SD 200 amps.

    The breaker feeding the #2 URD is 2-pole, 90 amps.

    The cable is feed thru conduit to the out building.

    NOTE: Robert M. thanks for your reply.


  4. #4
    Join Date
    Dec 2007
    Location
    Chico,Ca
    Posts
    423

    Default Re: netural/ground or grounding conductor

    If this is AL cable, #2 to a outbuilding may not have 100A overcurrent protection see table 310.16, 310.15(B)(6) may not be used to size the conductors as it does not meet the criteria allowing the conductors to be undersized.


  5. #5
    Join Date
    Apr 2009
    Location
    Manchester, Vermont
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    298

    Cool Re: netural/ground or grounding conductor

    Robert M. post dated 08/03/2012 01:55 A.M.

    The URD cable feed thru conduit enter into the electrician box inside
    the outbuilding, connect the panel main breaker disconnect.


  6. #6
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,245

    Default Re: netural/ground or grounding conductor

    Quote Originally Posted by Robert Mattison View Post
    Panel in an out building feed by a URD 4-wire cable.
    I've been meaning to ask, then keep forgetting which thread this was in ... what is "URD"?

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  7. #7
    Join Date
    Aug 2008
    Location
    Maryland
    Posts
    1,898

    Default Re: netural/ground or grounding conductor

    URD = underground residential distribution cable.

    All answers based on unamended National Electrical codes.

  8. #8
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
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    26,245

    Default Re: netural/ground or grounding conductor

    Quote Originally Posted by Jim Port View Post
    URD = underground residential distribution cable.
    Thank you kindly sir, I've not heard underground service laterals called that before. I guess those would then be USL?

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  9. #9
    Join Date
    Aug 2008
    Location
    Maryland
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    Default Re: netural/ground or grounding conductor

    These are a triplex or quadplex cable assrmbly. They cannot be used inside as there is no overall flame retardant sheath.

    All answers based on unamended National Electrical codes.

  10. #10
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
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    26,245

    Default Re: netural/ground or grounding conductor

    Quote Originally Posted by Jim Port View Post
    These are a triplex or quadplex cable assrmbly. They cannot be used inside as there is no overall flame retardant sheath.
    What's strange is that I searched Google for URD and URD cable before I asked and did not get any links back.

    After you said underground residential distribution cable I searched for underground distribution cable and came up with many links, then I searched URD cable and came up with other links.

    I guess Google did not find any URD in the stuff like I normally search, but once I searched the full term, Google says 'Oh, yeah, I know what you are looking for now ... '. That's one of the bad things about search engines keeping track of what you search ... seems they hesitate to 'go deep' in their search when you have not 'gone deep' in that direction before ... but, once you have, it finds all kinds of good things.

    Better late than never in the searches, I guess.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

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