(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 15 of 18

Thread: What is the size of my electrical service (pics)

Hybrid View

  1. #1
    DIY Junior Member teddynono's Avatar
    Join Date
    Sep 2010
    Location
    DC
    Posts
    6

    Default What is the size of my electrical service (pics)

    Hey Gang,

    I have 240v service coming in from outside. There are three wires--two hot and one neutral. I am not sure what gauge the service wire is.

    It comes into the panel and is connected to a 60 amp main breaker. But the wire going into the 60 amp main breaker looks narrower than the wire coming in from the street.

    Does that mean that each of the hot wires are 120 V and 30 amps (for 240 V and 60 amps total?).

    Or is it calculated some other way? Is the main breaker always sized to the maximum current that the service wires can carry?

    By the way, this is a Square D QO breaker box.

    Thank you!




  2. #2
    Electrical Contractor/Instructor jwelectric's Avatar
    Join Date
    Jun 2007
    Location
    North Carolina
    Posts
    2,523

    Default

    That is a split bus panel of either 150 or 200 amps.

  3. #3
    Electrical Contractor Jim Port's Avatar
    Join Date
    Aug 2009
    Location
    Maryland
    Posts
    156

    Default

    The 60 amp breaker is only to shut off power to the lower part of the panel. It is not a main to shut off the whole panel. You can have up to 6 breakers to shut down the power to the panel. The incoming lugs will still be hot.

    You can see some labeling in the larger insulated wires going to the topmost terminals in the panel. Tell the size and then someone can tell you what size service you have.

  4. #4
    Licensed Electrical Contractor Speedy Petey's Avatar
    Join Date
    Jun 2007
    Location
    NY State, USA
    Posts
    976

    Default

    Quote Originally Posted by jwelectric View Post
    That is a split bus panel of either 150 or 200 amps.
    I was going to say 100 or 150A.

  5. #5
    General Engineering Contractor ballvalve's Avatar
    Join Date
    Dec 2009
    Location
    northfork, california
    Posts
    3,261

    Default

    Seems to me he simply walks to the meter panel that feeds this and reads the breaker rating.

    Those wires arent coming off the transformer.

    Whats the mystery?

  6. #6
    DIY Senior Member Rich B's Avatar
    Join Date
    Sep 2008
    Location
    New Jersey
    Posts
    282

    Default

    Very interesting...never saw one of those. Is there a main breaker after the meter and before the panel? If there is not than the only way to shut off power to the panel is to pull the meter........
    Last edited by Rich B; 02-03-2011 at 11:28 AM.

  7. #7
    Licensed Electrical Contractor Speedy Petey's Avatar
    Join Date
    Jun 2007
    Location
    NY State, USA
    Posts
    976

    Default

    Quote Originally Posted by Rich B View Post
    Very interesting...never saw one of those. Is there a main breaker after the meter and before the panel? If there is not than the only way to shut off power to the panel is to pull the meter........
    No, the way to shut off power is to throw the (typically) four or six mains.

  8. #8
    Electrical Contractor Jim Port's Avatar
    Join Date
    Aug 2009
    Location
    Maryland
    Posts
    156

    Default

    Quote Originally Posted by ballvalve View Post
    Seems to me he simply walks to the meter panel that feeds this and reads the breaker rating.

    Those wires arent coming off the transformer.

    Whats the mystery?
    If this is a split buss panel, like several suspect, there is no breaker ahead of this panel.

  9. #9
    Licensed Electrical Contractor Speedy Petey's Avatar
    Join Date
    Jun 2007
    Location
    NY State, USA
    Posts
    976

    Default

    Quote Originally Posted by ballvalve View Post
    Seems to me he simply walks to the meter panel that feeds this and reads the breaker rating.
    A) Very few places have a main outside by the meter.

    B) You obviously have never seen a split-buss panel.

Similar Threads

  1. Electrical service wire for well pump -help--- well & elec. Question
    By loudhornsrule in forum Pumps and Tanks Well Forum & Blog
    Replies: 2
    Last Post: 04-06-2010, 03:58 PM
  2. service riser needs for an electrical service upgrade?
    By myladyfae in forum Electrical Forum discussion & Blog
    Replies: 9
    Last Post: 02-22-2010, 11:28 AM
  3. 50 year old electrical service enterance
    By luc in forum Electrical Forum discussion & Blog
    Replies: 9
    Last Post: 04-18-2009, 03:48 PM
  4. electrical service anamoly
    By 99k in forum Electrical Forum discussion & Blog
    Replies: 14
    Last Post: 01-21-2009, 07:34 AM
  5. Size of service entrance cable?
    By rdtompki in forum Electrical Forum discussion & Blog
    Replies: 13
    Last Post: 12-30-2007, 08:13 AM

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
  •