Circuit Breaker Question

Discussion in 'Electrical Forum discussion & Blog' started by eric3872, Jun 30, 2011.

  1. eric3872

    eric3872 New Member

    Messages:
    28
    Location:
    new york
    I need to add a 30 amp breaker to my panel for a clothes dryer. I understand that I need a 2P 120/240 breaker. The problem is that I only have a 1" slot available.

    My panel is a cutler Hammer. I found this single pole 30/30 tandem breaker (which will work on my panel), but I dont understand the difference between a 30/30 tandem single pole and a 30Amp double pole breaker.

    http://www.acehardwareoutlet.com/ProductDetails.aspx?SKU=31184&

    I'm trying to avoid having to rearrange circuits or adding a sub panel. Will this tandem breaker work? Any help would be appreciated.
  2. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,351
    Location:
    Houston, TX
    No Eric that breaker will not work. That breaker works 2 120V circuits.

    It needs to be a double pole for the 240V that the dryer needs.

    It will take up two inches in your breaker panel.


    Have a good day.


    DonL
    Last edited: Jun 30, 2011
  3. SacCity

    SacCity In the Trades

    Messages:
    189
    Location:
    Sacramento, CA
    You can use that breaker on two of your existing 120 volt lines to create the space needed for the 220 volt circuit.
    Michael
  4. eric3872

    eric3872 New Member

    Messages:
    28
    Location:
    new york
    Thanks. So, Is there such a thing as a 2P 30amp breaker that's only 1"?
  5. eric3872

    eric3872 New Member

    Messages:
    28
    Location:
    new york
    Not sure I understand what you're suggesting. This breaker is 1". It will only take one slot. Are you saying I could replace one of my single pole 15amp breaker with this one and combine the circuits from two of them into it to create the extra space?
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,183
    Location:
    New England
    They make skinny breakers to save some space in the panel, but physically, a 240vac breaker needs to be big enough to span two slots to be able to pick up both legs of the power to get the 240.
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,874
    Location:
    Cave Creek, Arizona
    1" 2 pole breakers are both on the same leg of the service panel. You need a breaker which connects to both legs, using two adjacent slots. Depending on your make and model, there are "piggyback" breakers which have a 30 amp 2 pole breaker in the center and (2) 15 or 20 amp ones on the outsides.
  8. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,351
    Location:
    Houston, TX
    I think it is a Westinghouse/Bryant/Cutler-Hammer-BD, Sylvania/Challenger/T&B.

    It would be nice hj, If it would work in that panel and only takes up two slots.

    What Michael said would work also, at the cost of two normal breakers.


    Have a nice 4th of July holiday weekend.


    And Remember Drink, Don't Drive...


    DonL
  9. Speedy Petey

    Speedy Petey Licensed Electrical Contractor

    Messages:
    996
    Location:
    NY State, USA
    For this style panel that is NOT a 2-pole breaker. It is a tandem/skinny/twin/etc breaker, which is two SP breakers.



    These are called "quad" breakers.
  10. Speedy Petey

    Speedy Petey Licensed Electrical Contractor

    Messages:
    996
    Location:
    NY State, USA
    Not for your panel. The only thing that would work would be a quad as stated above.
    [​IMG]
  11. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,351
    Location:
    Houston, TX
    Last edited: Jul 2, 2011
  12. BobL43

    BobL43 DIY Senior Member

    Messages:
    1,794
    Location:
    Long Island, NY
    Which ever way it is done, the 2 poles that supply the dryer 230volts should be a breaker assembly that has the trip levers tied together so they both flip off together. The 2 pole breaker in your first link looks like that. Having 2 seperate breakers, one plugged onto each phase without being next to each other and married together creates a safety hazard. If you turn off only one of these, the other will still be on supplying 115 volts at up to 30 amps to Neutral, if that is the breaker size. Your original post Don, I believe is the correct one. The service panels I have seen all require 2 inches of space to accomodate a 2 pole breaker and 1 inch tandem/twin breakers have 2 seperate protected feeds, but they are both on the same phase, 115 volts to neutral, 0 volts between the 2 individual protected circuits at the panel. Or if I misunderstood your post and your last sentence meant to rearrange the breakers to accomplish what I said, then good too.
  13. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,351
    Location:
    Houston, TX
    Yes BobL.


    The 115 volt dual 1" breaker will have to replace 2 of the current 1" 20 amp breakers to make room for the 2" 30 amp 230 volt breaker. He currently only has 1 1" slot available.

    And yes the 30 amp 230 volt breaker has the trip levers tied together so they both flip off together.

    Are we on the same page ?


    Enjoy your day.


    DonL
  14. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,874
    Location:
    Cave Creek, Arizona
    As an aside, the metal "bridge" in the breaker photo, is only needed if the outer breakers are also being used for a 220/240 device. It is removed to use it for two 120v circuits.
  15. BobL43

    BobL43 DIY Senior Member

    Messages:
    1,794
    Location:
    Long Island, NY
    Yes Don, same page :)

    Enjoy your day too; just came in from helping my wife re-arranging some pond plants. Guess who got in the pond and lifted out the potted pickel rushes?
  16. BobL43

    BobL43 DIY Senior Member

    Messages:
    1,794
    Location:
    Long Island, NY
    Iteresting looking breaker and metal clip on the 2 outside breakers.
  17. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,874
    Location:
    Cave Creek, Arizona
    That is just to make it a double two pole breaker. Not necessary if you are going one 2 pole and two single pole circuits.
  18. BobL43

    BobL43 DIY Senior Member

    Messages:
    1,794
    Location:
    Long Island, NY
    So I can see from how it is set up. I like it.
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