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    Studs ad's Avatar
    Studs ad Posts: 134, Reputation: 9
    Junior Member
    		  
    #1

    Apr 10, 2014, 05:55 PM
    What section of the NEC requires that SER cable be rated @ 60 C-specific
    The last code upgrade requires 1/0 SER cable for a 100 amp sub panel. I vaguely remember it being mentioned in code update class, but I can't seem to pinpoint the specific code area where this changed. Okay I forgot! A #1 used to be okay. I know it was changed, but I would like to see where or why it was changed.
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
    Ultra Member
    		  
    #2

    Apr 11, 2014, 03:41 AM
    Please try to be specific with this question...
    What year code? 2011? or 2014?
    Is this residential? Commercial?
    What is the system voltage? 208 volts or 240 volts? 3-phase or 1-phase?

    All of the above may make a difference in the minimum requirements for
    cable or conductor ampacity.
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #3

    Apr 11, 2014, 05:12 AM
    I believe you are asking about 338.10(A)(4).

    This applies to the use of type SE cables for interior wiring. But it was not rewritten in NEC 2014.
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
    Ultra Member
    		  
    #4

    Apr 11, 2014, 05:33 AM
    Actually Don, this may be about 310.15(B)(7), which has been re-structured. After you look at it and do the math it really doesn't change much, although you do have have to verify case by case.
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #5

    Apr 11, 2014, 06:16 AM
    Agreed, 310.15(B)(7) caught my eye when the pre-release was sent to me.

    Once you do the math and look at the previous you see you end up at the same conductor size.

    I guess they just wanted to exercise the, "little gray cells", to quote Agatha Christie's Hercule Poirot
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
    Ultra Member
    		  
    #6

    Apr 11, 2014, 06:51 AM
    yeah, we call it the 83% solution...
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