Results 1 to 8 of 8

Thread: jumper at main

  1. #1
    Jerome W. Young's Avatar
    Jerome W. Young Guest

    Default jumper at main

    hmmm. i know its wrong but i cant come up with all the reasons.

    Similar Threads:
    ***IMPORTANT*** You Need To Register To View Images ***IMPORTANT*** You Need To Register To View Images
    Crawl Space Creeper

  2. #2
    Join Date
    Mar 2008
    Location
    Charlotte NC
    Posts
    2,304

    Default Re: jumper at main

    Three phase panel wired with single phase power.


  3. #3
    Join Date
    Aug 2008
    Location
    Maryland
    Posts
    1,970

    Default Re: jumper at main

    The problem is the lug is only listed for use with one conductor.


  4. #4
    Join Date
    Mar 2007
    Location
    Fletcher, NC
    Posts
    28,032

    Default Re: jumper at main

    Quote Originally Posted by Jim Port View Post
    The problem is the lug is only listed for use with one conductor.

    Plus the jumper is too small.

    I also see, top left breaker (100 amp), which supplies SOMETHING and there is no neutral, and it looks like there is another similar cable behind it.

    If that supplies another panel, that feeder needs to have 4 wires: 2-hot, 1-neutral, and 1-ground.

    If that supplies equipment or appliance which is truly only 240 volts (and there is no 120 volt aspect in it), then those should be okay, but at 100 amp ... that is rather large for a single appliance.

    Jerry Peck
    Construction/Litigation/Code Consultant - Retired
    www.AskCodeMan.com

  5. #5
    Join Date
    Aug 2008
    Location
    Maryland
    Posts
    1,970

    Default Re: jumper at main

    Even if the wire were properly sized it would still be wrong for the reason I posted.


  6. #6
    Jerome W. Young's Avatar
    Jerome W. Young Guest

    Default Re: jumper at main

    that 100 amp feeds a non service panel whose neutrals and grounds are not floated

    the main service cables are 1/0 copper with a 200 amp block type fuse. lots of things for an electrician to do here.


  7. #7
    Join Date
    Mar 2007
    Location
    Fletcher, NC
    Posts
    28,032

    Default Re: jumper at main

    Quote Originally Posted by Jim Port View Post
    Even if the wire were properly sized it would still be wrong for the reason I posted.
    I know, that's why I quoted you and said "Plus ... ".

    Jerry Peck
    Construction/Litigation/Code Consultant - Retired
    www.AskCodeMan.com

  8. #8
    Join Date
    Mar 2007
    Location
    Fletcher, NC
    Posts
    28,032

    Default Re: jumper at main

    Quote Originally Posted by Jerome W. Young View Post
    that 100 amp feeds a non service panel whose neutrals and grounds are not floated
    Not allowed.

    Needs to be a 4-wire feeder cable.

    Jerry Peck
    Construction/Litigation/Code Consultant - Retired
    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
  •