NEC 225.19(A) vs 230.24(A)

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DimlyLit

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Location
Seattle, WA
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Electrician 4y
Why is there a 6" difference in allowable roof clearance heights for conductors over a roof? One requires 8ft, and the other requires 8'6".
What am I missing?
 
As to why the difference, no idea but 225 is for branch circuits and feeders whereas 230 is for services..
There are subtle differences between the two.
 
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