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Thread: a.f.c.

  1. #1
    Join Date
    Oct 2018
    shelby twsp mi


    the electrical inspector wants available arc fault currents from DTE . i was told i could find them on here .

  2. #2
    Join Date
    Jan 2009
    3 Hr 2 Min from Winged Horses
    You need to contact them for existing services.

    Here is their install manual, it refers to new services and future fault current.
    "Electricity is really just organized lightning." George Carlin


  3. #3
    Join Date
    Feb 2003
    Welcome to the Forum, Joe.

    It looks like "DTE" is your local power company? If so, the only place that can answer the inspector's requirement is the local power company engineering department. They will have the calculations already in place for the fault currents available at the points on their existing transmission system. That transmission system fault current will then be supplied to your customer's transformer, the size of which will then give the final value of available fault current that your customer's service equipment has to be able to withstand and interrupt.

    The Forum can tell you what the idea is, but only your local power company engineer can give you the value for your specific customer.
    Another Al in Minnesota

  4. #4
    Join Date
    Dec 2007
    NE Nebraska
    Keep in mind they possibly may give you a figure that is high just for CYA purposes.

    Actual fault current is dependent on size and impedance of transformer, available current that the primary side can deliver, and conductor size, type, length between source and point you want to know the available current for. Available current will be higher at transformer terminals than it is at your service disconnect, short run between them may not lower it much but it will be lower.
    I live for today, I'm just a day behind.

  5. #5
    Join Date
    Feb 2003
    Bremerton, Washington
    Eaton has a on line software program that will calculate the AFC. You need the info from DTE, type of wire, size, distance and type of conduit.
    Moderator-Washington State
    Ancora Imparo

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