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  1. #1
    Join Date
    Jul 2007
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    Chicago
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    Default Quick question, no pic

    Is 12awg stranded copper acceptable for a 25amp Type S fuse? Can find anything on it. TIA...

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  2. #2
    Join Date
    Mar 2007
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    Ormond Beach, Florida
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    26,248

    Default Re: Quick question, no pic

    No.

    The maximum allowed overcurrent protection rating for #12 AWG is 20 amps.

    (Unless that is for an air conditioning unit and the nameplate says otherwise, but I doubt that is for an air conditioning unit.)

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
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    Jul 2008
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    Snowbird (this means I'm retired and migrate between locations), FL/MI
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    Default Re: Quick question, no pic

    What's the application (load type, etc.) and wiring method? Componant, house wiring, RV, sound system, amplifier, etc.?

    In free air, metallic conduit, cable assembly?

    Why "S" and not "SL" or other more time limited?


  4. #4
    Join Date
    Jul 2007
    Location
    Chicago
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    187

    Default Re: Quick question, no pic

    It was for common area lighting of 2 unit (used to be 4 apartments) vintage condo. I called it out but 'likely' has minimal load. Was in EMT, no labeling as to function on panel.


  5. #5
    Join Date
    Jul 2008
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    Snowbird (this means I'm retired and migrate between locations), FL/MI
    Posts
    4,086

    Default Re: Quick question, no pic

    Thats no good. No to outlets & lights.

    Direct to equipment, motors and such can be okay.

    Here's a link to a well written example of #12 awg 75C conductors & equipment used at 25 amps protected by 45 Amp Breaker.

    You might find the discussion on the short topic string interesting:
    #12 AWG on 25 amp OPD - Electrician Talk - Professional Electrical Contractors Forum

    Last edited by H.G. Watson, Sr.; 12-10-2010 at 05:13 PM.

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