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Overdutied Device Interrupting Ratings

Discussion in 'System Modeling and Calculations' started by jkopinski, Jul 15, 2010.

  1. jkopinski New Member

    NFPA 70E says that "design" and "condition of maintenance" should be taken into account for arc flash hazard analysis.

    For equipment with over-dutied interrupting ratings what is the proper approach for an arc flash hazard analysis? As in what was the intention of NFPA in incorporating design, or lack thereof, into the analysis?
    jkopinski, Jul 15, 2010
    #1

  2. Zog Well-Known Member

    I suume you mean your available fault current is > the AIC rating of your breaker? If so I would not assume that breaker is an OCPD at all.

    The 70E is not a design or instalation standard, that is what the NFPA 70 is for (NEC).

    Good question, interested to see what others do in this case.
    Zog, Jul 15, 2010
    #2

  3. acobb Well-Known Member

    If you cannot find an acceptable method to lower the available fault duty, then I would replace the equipment while there is still something to replace.
    acobb, Jul 15, 2010
    #3

  4. cbauer Well-Known Member

    NFPA 70 should not be considered a "design standard". I would classify it more as a "minimum requirememnts installation guide".
    cbauer, Jul 15, 2010
    #4

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