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Thread: Fault Current

  1. #1
    Join Date
    Mar 2003
    Location
    Illinois
    Posts
    12

    Fault Current

    What is the formula for calculating the available fault current at a specific point on an AC electrical system.

  2. #2
    Join Date
    Feb 2003
    Location
    Washington
    Posts
    104

    Re: Fault Current

    Go here mark - there are a number of fault current calculators on Mike Holt's website, freebies too.
    http://www.mikeholt.com/freestuff.php?id=freegeneral

  3. #3
    Join Date
    Feb 2003
    Location
    Plano, TX
    Posts
    3,773

    Re: Fault Current

    It is a process of steps:

    1. Obtain availible fault current from utility.
    2. Determine KVA and impedance of transformer.
    3. Type of conduit and conductor.
    4. Length of circuit
    5. Number of phases involved.
    6. Selct phase and conductor size.
    7. Select neutral size.

    Once you obtain all the information you plug into worksheet.

  4. #4
    Join Date
    Feb 2003
    Location
    Indianapolis
    Posts
    6,102

    Re: Fault Current

    You can also find fault current calculations at Bussman's web site.
    Charlie Eldridge, Indianapolis, Utility Power Guy
    Responses based on the 2011 NEC, unless stated otherwise.

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