Derating facor

Location
Miami Fl.
Occupation
Electrical Designer
Im doing some electrical plans for this electrician, and he has 30 #3 THHN cu wire in 4"C. These 4"C is about 8 ft long. serving a load gutter, which from this gutter goes to 10 -100a aprtment load center. is it a code violation because of the derating factor.
 
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