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Thread: breaker size

  1. #1
    dan orourke's Avatar
    dan orourke Guest

    Default breaker size

    Last edited by dan orourke; 01-02-2008 at 09:17 AM.
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  2. #2
    Join Date
    Mar 2007
    Philadelphia PA

    Default Re: breaker size

    If AC plate says max 45, then max 45 it is. If 50 was ok, they'd say max 50.
    This has been discussed a number of times, not that I'm suggesting you shouldn't have posted it, just a reminder that the archive is a great resource.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)

  3. #3
    James Duffin's Avatar
    James Duffin Guest

    Default Re: breaker size

    The problem is that 45 amp breakers are rare except at a real live wholesale house. The breaker or fuse should be 45 amps in this application. Check out 240.6 in the NEC for a run down on standard sizes. Good info to be had...

  4. #4
    Richard Rushing's Avatar
    Richard Rushing Guest

    Default Re: breaker size

    - SECTION M1307- - APPLIANCE INSTALLATION- - - M1307.1 General. Installation of appliances shall conform to the conditions of their listing and label and the manufacturer's installation instructions. The manufacturer's operating and installation instructions shall remain attached to the appliance.

    IRC 2003,
    --E3602.11 Branch circuits for air-conditioning and heat pump equipment. The ampacity of the conductors supplying multimotor and combination load equipment shall not be less than the minimum circuit ampacity marked on the equipment. The branch-circuit overcurrent device rating shall be the size and type marked on the appliance and shall be listed for the specific purpose.

    G2408.1 (305.1) General. Equipment and appliances shall be installed as required by the terms of their approval, in accordance with the conditions of listing, the manufacturer’s instructions and this code. Manufacturers’ installation instructions shall be available on the job site at the time of inspection. Where a code provision is less restrictive than the conditions of the listing of the equipment or appliance or the manufacturer’s installation instructions, the conditions of the listing and the manufacturer’s installation instructions shall apply.

    Just because someone can't/won't take their arse to the supply house doesen't make it right. Write'em-up everytime.


  5. #5
    Join Date
    Mar 2007
    Lake Barrington, IL

    Default Re: breaker size

    Funny how many people don't understand the word "maximum."

    I was at an evening H.I. meeting a couple of years ago. The HVAC company doing the presentation said that they frequently drop in breakers larger than the data plate listing and saw no problem with doing so. Then someone asked what happens to the compressor's warranty. The tech's response was that it would probably be voided. No duh! Least he was smart enough to realize that.

    Eric Barker, ACI
    Lake Barrington, IL


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