Direct-buried conductive optical fiber cables
shall be separated by at least 300 mm (12 in.) from conductors of any electric light, power, or non-power-limited fire alarm circuit conductors or Class 1 circuit.
Exception No. 1: Separation shall not be required where the electric service conductors are installed in raceways or have metal cable armor:
Exception No. 2: Separation shall not be required where the electric light or power branch-circuit or feeder conductors, non-power-limited fire alarm circuit conductors, or Class 1 circuit conductors are installed in a raceway or in metal-sheathed, metal-clad, or Type UF or Type USE cables.