Derating again

[electricalist]

310.15(b)(3)( c) ambient temperature adjustment.
Is this adder added to my ambient temperature 86 f or is the adder added to the wire type rating 60 , 75 , 90


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[augie47]

The adder is added to your ASHRAE summer temperature
https://www2.iccsafe.org/states/vir...ndix d_degree day and design temperatures.pdf

 

[electricalist]

Now it's making more sense.
Ty sir


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