Derating And pipe fill

[nickelec]

Does pipe fill , and derating rules apply to 24v systems? I'm trying to design and up coming project and can't find anything in the nec in regards to this

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[don_resqcapt19]

What are the functions of the conductors in question?

 

[nickelec]

Control wiring

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[don_resqcapt19]

Control circuits are typically Article 725 installations. 725.3(A) says that the raceway fill requirements of the xxx.22 sections of the raceway articles apply. If the control circuit conductors part of a Class 1 circuit, see 725.51(A) for ampacity adjustment. See 725.130 if the control circuits are Class 2 or 3 circuits. The rules are not clear, but the typical assumption is that ampacity adjustment is not required.