Wireway derating

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Greenboy

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Seattle, WA
It is unclear to me as to how many conductors we need to count when derating current carrying conductors in wireway. Code states that anything over 30 CCC's we need to derate.

My question is: Do we Start counting from 31(as conductor #1) and so on? Or does it start from one, meaning we would need to derate for 31 conductors?

I understand the 24" rule, so this would need to be for conductors/wireways longer than 24".
 
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