Conductors for Cable Tray

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don_resqcapt19

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Location
Illinois
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retired electrician
Is a single conductor, THHN/THWN-2 rated for cable tray? If so, where in code can I find info to support this?
Many single conductors 1/0 and larger are suitable for use in cable tray (in industrial installations) and are marked as such. See 392.10(B)(1).
 
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