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  1. #1
    Join Date
    Jul 2007
    Location
    Chicago
    Posts
    187

    Default Service ampacity

    Based on conductor size (appears 2/0) I am calling this 100 amp service. No main breaker and UP TO 800 amp rated main panel in common area in 6 unit condo bldg. Ground and neutral isolated.

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  2. #2
    Join Date
    Feb 2008
    Location
    Sioux City, Iowa
    Posts
    45

    Default Re: Service ampacity

    Ross,

    The main service wire appears to be copper and if it is 2/0, then it is rated at 200 amps. Is this the main supply panel for the building? Is there a main throughout switch in a differnet location?

    Mike Tracy


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

    Default Re: Service ampacity

    This is not the main, its downstream as are the other 5 in this 6 unit condo bldg. Again, I was not able to determine the size of the main.


  4. #4
    Join Date
    Mar 2007
    Location
    Chicago
    Posts
    164

    Default Re: Service ampacity

    Quote Originally Posted by Ross Neag View Post
    This is not the main, its downstream as are the other 5 in this 6 unit condo bldg. Again, I was not able to determine the size of the main.
    Hi Ross,

    If the building has an 800 amp service for a 5 or 6 flat bldg, and this is 2/0 to the condo panel it is a 200 amp not 100 amp panel.

    There should be an electrical closet that has the main to building and likely indiviudal mains to each condo. If it is an 800 they probably used modular metering and the main disconnects for each condo are in the enclosure with the meters in the electrical closet.

    Sincerely,

    Corey


  5. #5
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    25,305

    Default Re: Service ampacity

    Ross,

    There will be, should be, a "main" at the service equipment area for this panel and the other panels, as well as a "main" for everything at the service equipment.

    The service supplies the service equipment.

    The service equipment feeds the individual mains (no longer service equipment mains).

    The individual mains feed the individual panels. The overcurrent protection for the panels is the individual mains. The rating of the individual panel must meet the rating of the overcurrent protection feeding it, as must the rating of the feeders from that overcurrent protection to the individual panels.

    By the way, I'm guessing that there are a lot of multi-wire circuits in there, and, with those open breaker spaces, someone may have moved (relocated) breakers to other spaces, while that is not a problem on regular 2-wire circuits, moving the breakers on a 3-wire multi-wire circuit *could be* a problem (depending on if the person moving them knew what they were doing or not, and if they did what they knew or not).

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

  6. #6
    Join Date
    Jul 2007
    Location
    Chicago
    Posts
    187

    Default Re: Service ampacity

    Thanks gentlemen. I will make the adjustment and appreciate your help.

    R


  7. #7
    Join Date
    Mar 2007
    Location
    New Mexico
    Posts
    1,222

    Default Re: Service ampacity

    Are you sure those are 2/0 cable? 2/0 is pretty big, and those look more like #2, which is what you would expect on 100 amp service. It's hard to tell from the photo, but looking at them in relation to the breakers, they don't look like 2/0 from here.

    Jim Robinson
    New Mexico, USA

  8. #8

    Default Re: Service ampacity

    It does't look like 2/0 to me either.


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