De rating Busway in high temp area

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We are installing a 480v 2000a busway over a high temperature area. The busway is over the high temp area and not the feeder piping and cables. I understand the busway would have to be de rated but would the feeder cables also need to be de rated even though they do not go over the high temperature area?
 
Correction for ambient temperature applies only to the section subject to that ambient.

Thank you for the reply! I did not think the feeders feeding the bus in high temp area needed to be de-rated but the engineer had told us that it did. Is there anything in the code book that discusses de-rating only the section subject to that ambient temp?
 

Smart $

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Ohio
Thank you for the reply! I did not think the feeders feeding the bus in high temp area needed to be de-rated but the engineer had told us that it did. Is there anything in the code book that discusses de-rating only the section subject to that ambient temp?
Implied in 310.15(A)(2) & (A)(3) Informational Note.
 
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