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Joined: Jun 2012
Posts: 75
Member
If I have a j box in the basement where all branch circuits end..and need to extend four feet through foundation to panel

Is there a derating requirement from the j box to the panel based on length?


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Joined: Jul 2004
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24" of grouped conductors starts kicking off derating. In #12 and #14 using 90c conductors you are usually not in trouble until you get 9 in a pipe.


Greg Fretwell

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