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#214531 12/18/14 11:28 PM
Joined: Mar 2004
Posts: 814
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BigB Offline OP
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When derating THWN-2 copper conductors for ambient that will eventually terminate in a sub panel with a 125 amp rating can I use the 90C column?

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Joined: Jun 2004
Posts: 1,273
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The sole and only reason for that column IS derating.

For there are no 90 degree rated devices out there.

One then uses the lesser computed ampacity limit.

So, yes, you start with the 90 degree column.


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