Results 1 to 4 of 4
  1. #1
    Join Date
    Jul 2007
    Location
    Chicago
    Posts
    187

    Default No visible ground 40 unit bldg

    No ground in panel or water service in unit of 40 unit condo bldg. I always thought downstream panels' neutral should not be bonded but there is no ground here unless the panel connection to feed is the ground. Outlets all tested correct and grounded.

    Similar Threads:
    ***IMPORTANT*** You Need To Register To View Images ***IMPORTANT*** You Need To Register To View Images
    F.I.R.E. Services

  2. #2
    Join Date
    Mar 2007
    Location
    Santa Rosa, CA
    Posts
    2,286

    Default Re: No visible ground 40 unit bldg

    Ross,

    No ground wires? Hmm. Could the grounding be provided by metal conduits?

    Department of Redundancy Department
    http://www.FullCircleInspect.com/

  3. #3
    Join Date
    Jul 2007
    Location
    Chicago
    Posts
    187

    Default Re: No visible ground 40 unit bldg

    Such a rookie. Thanks.


  4. #4
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    25,313

    Default Re: No visible ground 40 unit bldg

    Quote Originally Posted by Gunnar Alquist View Post
    No ground wires? Hmm. Could the grounding be provided by metal conduits?

    Ross,

    Don't need to let them off that lightly, though.

    Yes, likely 'metallic raceway', but ... that bushing and nut in your photo is in concentric knock outs ... and every electrician should know that is *not good*.

    Depending on how old the building it, it may have required ground bonding bushings or lock nuts and ground bonding jumpers at the time of installation, or it might just need them to be installed now.

    Just because electricians, manufacturers, etc., were not aware of the problem for many years or decades does not mean the problem did not exist then, nor does it mean the problem does not still exist today (it does - electricity does not read the code book to find out whether or not it is allowed to cause a problem and create havoc and cause shock or fires).

    The problem with concentric knock outs is (if you've looked at them) that there is only a small area of metal on two sides connecting the small left-in-place-knock-out-ring which is then connected to the next one via only two more small areas of metal, and, to make matters worse, these *are designed and intended* to fatigue and break easily.

    Between the fact that there is a high resistance through those small areas of metal, and the fact that many times one or both sides are broken through, there may not be any ground path there any more, or at best a very limited ground path.

    Especially on the feeder conduit entry, that needs a ground bonding bushing or locknut with a ground bond to the enclosure.

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

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •