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Electrical help pls, what amperage is this breaker

Discussion in 'Off-Topic' started by boatman, Feb 11, 2019.

  1. boatman

    boatman

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    Unsure of how breakers are notated for 240 V, this is on my water heater circuit, see position 13-15. This is a double/ganged breaker, I think this is 40A total for the 240V, and not 80 total, right? 40A on each 120, so 40 total on the 240? thanks.
     

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  2. Super99Z

    Super99Z NES Member

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    40
     
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  3. arsco

    arsco NES Member

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    2 pole 40amp
     
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  4. n1bsbri

    n1bsbri NES Member

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    40 amp at 240 volts,
    2X 40 amp at 120 volts
     
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  5. one-eyed Jack

    one-eyed Jack Manufacturer Dealer NES Member

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    That's why they put"40" on the breaker. Jack.
     
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  6. chrbla2000

    chrbla2000 NES Member

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    He was probably hoping for a 9mm or .45 breaker instead of a fo-tay.
     
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  7. Super99Z

    Super99Z NES Member

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    They really don't want consumers doing math[​IMG]
     
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  8. Mark from MA

    Mark from MA NES Member

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    No one likes 40 here....even in electrical service boxes.
     
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  9. slap shot

    slap shot NES Member

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    which one?, the one that says 40 or the one that says 30? or the one that says 60? [rofl]

    i'm sorry, i can't help it sometimes...
     
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  10. SERE

    SERE NES Life Member NES Member

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    I was ready, too, but he had this in there:
    [angry]
     
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  11. Mr.E

    Mr.E

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    upload_2019-2-11_15-20-57.jpeg
     
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  12. MisterHappy

    MisterHappy NES Member

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  13. Spanz

    Spanz NES Member

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    in a 120 v system, there is a hot lead, and a return lead. In the USA the hot lead is colored black, and the return lead is white. If the white lead gets cut, and touches earth ground somewhere....nothing happens as the return lead is also at 0 volts (approximately). So in a 120V system, you only need to fuse the hot lead.

    But in a 240 V system, it is really comprised of TWO 120V circuits. I guess you can think of one as being Positive polarity, and the other negative polarity. If EITHER of these two hot leads is cut and touches earth ground, there will be a short circuit and a big arc of current forms. You do not know ahead of time if the positive lead, or the negative lead will be the one short circuiting, so you have to put a circuit breaker on BOTH hot leads. If Either of them shorts out, you want to turn off the other one, even if it is not short circuited, for safety reasons, so the two circuit breakers are ganged together with a physical bar.

    Normally current flows out of the positive lead circuit breaker, to the load, then back to the negative lead circuit breaker, completing the circuit loop. NO current should flow in the neutral wire at all. So even though there are two 40 amp circuit breakers, the actual current in the loop is only 40 amps. The same 40 amps flows thru each breaker.
     
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  14. radioman

    radioman NES Member

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    Looks like you got your answer. To simplify———
    A 240v 40a breaker is 40a total. Not 80.
     
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  15. Mr. Brownstone

    Mr. Brownstone NES Member

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    Wanna really blow his mind...
     

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  16. Winchester73

    Winchester73

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    I wired this once. The hard part was getting the Holy Water to remain Holy.
     
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  17. AHM

    AHM NES Member

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    "We really try and discourage people from arithmetic".
    -- Marsha​
     
  18. Spanz

    Spanz NES Member

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    [​IMG]

    you ONLY use one of those if you need to reverse the polarity of the neutron flow
     
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  19. alpineboard

    alpineboard

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  20. 1776

    1776 NES Member

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    Test it with a wet finger. I'll have to check the book on those positions...never got that far!
     
  21. SgtHal75

    SgtHal75 NES Member

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    Hahahaha!!!!!
     
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  22. JackOfAllTrades

    JackOfAllTrades

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    Yep... where 120+120=208.
     
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  23. Mr. Brownstone

    Mr. Brownstone NES Member

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    And 120+120+120 = 208 as well.
     
  24. 1776

    1776 NES Member

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    The flux converter needs to be in temporal phase
     
  25. 556USER

    556USER NES Member

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    All the current is lagging by 90 degrees.
     
  26. one-eyed Jack

    one-eyed Jack Manufacturer Dealer NES Member

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    If it runs backwards change any two wires. (3phase, that is) Jack.
     
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  27. 556USER

    556USER NES Member

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    Yep 120 degree phase diff says Nikola Tesla
     
  28. 1776

    1776 NES Member

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    I always change the outer two to reverse direction
     
  29. MisterHappy

    MisterHappy NES Member

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    On the 16 yard line, shootin' for the Lewis!
    I would have put my money on the ee, or the warm front. [laugh]
     
  30. RHJJ

    RHJJ NES Member

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    Good chance it is 40.
     

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