Section 770.133
Conductive optical fiber cables contained in an armored or metal-clad-type sheath and nonconductive optical fiber cables shall be permitted to occupy the same cable tray or raceway with conductors for
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Can I Install Fiber Optic Cable With Electrical Cable In The Same Tray?
The NEC explicitly states that conductive optical fiber cables are not allowed to occupy the same cable tray or raceway as the aforementioned electrical conductors.
(A) In Cable Trays and Raceways
Conductive optical fiber cables with armored or metal-clad sheaths can be installed alongside electric light, power, and certain communication circuit conductors in the same cable tray or raceway,