Results 1 to 8 of 8
  1. #1
    Join Date
    May 2007
    Location
    Wilkes-Barre, Pa.
    Posts
    6

    sub panel question

    hello everyone, I'm curious about something I saw today and I'm not really sure it is safe. can a 2 pole 60 amp and a 2 pole 30 be installed safely in a 60 amp sub panel? thanks in advance for any replies

  2. #2
    Join Date
    Mar 2008
    Location
    Central Maryland
    Posts
    246
    Quote Originally Posted by blackwater View Post
    hello everyone, I'm curious about something I saw today and I'm not really sure it is safe. can a 2 pole 60 amp and a 2 pole 30 be installed safely in a 60 amp sub panel? thanks in advance for any replies
    Assuming it has a 60 amp breaker-

    safe, yes

    useful, depends.

    -HF

  3. #3
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,773
    If the 60 amp box is protected by a 60 amp breaker it can.
    Its just a waste to do it.
    If the 60 amp box is protected by a 60 amp or less. Then it is unsafe.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Apr 2002
    Posts
    11,808
    the manufacturer may have a maximum size branch breaker, and I would suspect this is a physical limitation.

    Your sub panel could be getting back fed through that 60A breaker

  5. #5
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,773
    Could be that the 60 amp breaker he is seeing, is the 60 amp main breaker for the sub panel.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  6. #6

    Why is it unsafe

    Quote Originally Posted by beenthere View Post
    If the 60 amp box is protected by a 60 amp breaker it can.
    Its just a waste to do it.
    If the 60 amp box is protected by a 60 amp or less. Then it is unsafe.
    I'm just a homeower (Electrical Engineer by training, but do software
    these days). And I don't do any big time wiring.

    But I guess I don't see why having a 60 amp 240 V box being protected
    by a smaller breaker (that presumably is one each leg) is unsafe.

    You are saying that a smaller breaker is unsafe while a larger one is safe?

    Won't the box that has the small breaker just be very likely to trip?

  7. #7
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    Quote Originally Posted by bobRitchie View Post
    I'm just a homeower (Electrical Engineer by training, but do software
    these days). And I don't do any big time wiring.

    But I guess I don't see why having a 60 amp 240 V box being protected
    by a smaller breaker (that presumably is one each leg) is unsafe.

    You are saying that a smaller breaker is unsafe while a larger one is safe?

    Won't the box that has the small breaker just be very likely to trip?
    so your saying that a 30 amp is feeding this 60 amp box?

    if so that is fine, the 30 will trip and prtect the circuit.

    but why use a 60 in that box if its being feed by a 30? inless this 60 amp breaker isn't a breaker but a disconnect style of breaker

    just what is this panel going to? i need a better understanding of what is going on in this situation
    If Guns Kill People, Do Pencils Misspell Words?

    http://www.youtube.com/watch?v=An2a1...eature=related

    Before we work on artificial intelligence why don't we do something about natural stupidity?

  8. #8
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,773
    Quote Originally Posted by bobRitchie View Post
    You are saying that a smaller breaker is unsafe while a larger one is safe?
    Meant to type "Then its not unsafe".
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event