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Arc Flash for SWBD c/w Main BKR & Feder BKR's

Discussion in 'General Discussion' started by Shereen, Jan 14, 2009.

  1. Shereen New Member

    In regards to calculating energy and attaching arc flash labels to switchboards / panels (which has main breaker and many feeder breakers), I appreciate if anyone who's familiar with NFPA, IEEE and safety practices to clarify the following:
    1-Where do we consider calculating the energy on the switchboard / panel (on the line side of the main breaker, or the load side of the main breaker)?
    2-Do we require attaching labels on each breaker of the switchboard / panel ? If that’s requested by the client, in this case, do we consider calculating the energy after the breaker (on the load side) or before the breaker (on the line side) of each breaker ( Main or Feeder)?
    I appreciate your opinions, Thank you !
    Shereen, Jan 14, 2009
    #1

  2. Zog Well-Known Member

    It sounds to me from your post that your company has been hired to do this analysis, I would hope that you are familar with NFPA 70E and IEEE.

    Both


    You calulate the Ei for the equipment, if you are talking about a breaker then you need to consider what is feeding it for your analysis.
    Zog, Jan 14, 2009
    #2

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