breaker size for 12 gauge wire

Discussion in 'Electrical Forum discussion & Blog' started by whoazone, Jul 15, 2008.

  1. whoazone

    whoazone New Member

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    What is the largest breaker I should use on 12 gauge wire? How about 14 guage wire?
     
  2. jbfan74

    jbfan74 Electrical Contractor

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    #12=20 amp breaker
    #14=15 amp breaker
     
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  4. whoazone

    whoazone New Member

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    Can 10 gauge wire handle a 30 amp breaker?
     
  5. Speedy Petey

    Speedy Petey Licensed Electrical Contractor

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    Basically, yes.
     
  6. Mike Swearingen

    Mike Swearingen New Member

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    30 amp breaker with 10g wire is usually what is used for an electric water heater.
    Mike
     
  7. hj

    hj Moderator & Master Plumber Staff Member

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    wires

    Are you asking for a specific appliation, or just fishing for information?
     
  8. pudge565

    pudge565 New Member

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    Dec 30, 2007
    If using ROMEX® those answers are correct but if its not ROMEX® it depends on the wire insulation type and if it needs to be derated.
     
    Last edited by a moderator: Dec 7, 2011
  9. Chris75

    Chris75 Electrician

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    What are you talking about? Try reading 240.4(D)
     
    Last edited by a moderator: Dec 7, 2011
  10. pudge565

    pudge565 New Member

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    Dec 30, 2007
    Yes my bad I don't know what I was thinking maybe flexible cords?
     
  11. Johnny C

    Johnny C Electrician

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    Breaker size for # 12 wire

    You have not specified what type load and what type overcurrent protection is provided ie. (circuit breaker or fuse) the #12 conductor is supplying. If the circuit is supplying a motor load, the NEC allows a CB or Fuse rated greater than the conductor ampacity.
     
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