Results 1 to 7 of 7
  1. #1
    Join Date
    Mar 2007
    Location
    Tampa, Fl
    Posts
    155

    Default Service Ampacity

    What would you rate this service at?

    1/0 Copper Service Entrance Conductors
    Service Equipment panel had 3 Breakers for means of main disconnect.
    100A to house panel
    30A to pool panel
    60A to HVAC package unit panel

    Service Equip. Panel had no ampacity rating visible on label.

    Similar Threads:
    Inspection Referral SOC

  2. #2
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
    Posts
    4,798

    Default Re: Service Ampacity

    If its 1/0 its rated upto 150 amps.

    The value of experience is not in seeing much, but in seeing wisely.

  3. #3
    Jon Randolph's Avatar
    Jon Randolph Guest

    Default Re: Service Ampacity

    The rating that you give the service should be the smaller of the SEC, panel rating or main isconnect rating. Make sure that you are looking at the lines from the mast to the pole also and not just from the meter to the main.

    Without a legible lable on the panel, I would state that I could not verify the size of the service and state why.


    Make sure that you do not rate it at more than it is capable of or you may be upgrading it youself.


  4. #4
    Join Date
    Jun 2007
    Location
    Farmington, MN
    Posts
    69

    Default Re: Service Ampacity

    Dont forget to take into account the meter as well, Older ones are not rated as high as newer ones. somewhat of a rule of thumb. round = 60 amp, square = 100 amp, rectangular = 150+

    Lanny Freng
    Inspection WerX
    "Get the Best of US before your new home gets the best of YOU!"

  5. #5
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    25,313

    Default Re: Service Ampacity

    Quote Originally Posted by Jon Randolph View Post
    The rating that you give the service should be the smaller of the SEC, panel rating or main isconnect rating.

    Except, as in this case, when there are multiple main disconnects, then the smaller of the service entrance conductor rating or the combined rating of the multiple mains. While multiple mains cannot be combined to get a true rating, they can be combined to get a 'maximum rating', and if that is smaller than the service entrance conductors, then that 'maximum rating' would be the service size, i.e., being the smaller of the two.

    In the case stated above:
    1/0 Copper Service Entrance Conductors
    Service Equipment panel had 3 Breakers for means of main disconnect.
    100A to house panel
    30A to pool panel
    60A to HVAC package unit panel

    The 1/0 copper is rated for 175 amps, the 3 multiple mains add up to 190 amps, thus the service size is 175 amps.

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

  6. #6
    Join Date
    Mar 2007
    Location
    Lake Barrington, IL
    Posts
    1,363

    Default Re: Service Ampacity

    Around here you cannot take into account the size of the overhead drop. First of all, the utility can put in whatever gauge they want up to the house and no one can say boo about it. Second, the overhead conductors are surrounded by air, an insulator not found around the conductors in the home wiring. Therefore, "standard" ratings do not apply.

    Eric Barker, ACI
    Lake Barrington, IL

  7. #7
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    25,313

    Default Re: Service Ampacity

    Quote Originally Posted by Eric Barker View Post
    Around here you cannot take into account the size of the overhead drop.

    Eric,

    Should not be concerned with the size of the overhead service drop anywhere (unless it's #10 wire ).

    We are talking about the "service entrance conductors", not the "over head service drop conductors".

    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
  •