How high should the optical fiber cable be from the power supply

Need some clarification about NEC 770. 47 (B), it says that the direct buried conductive fiber optic cable shall be 12 in (300 mm) away from the power cables. Is this 300 mm separation from the center of the power cable ...

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The exception in NESC rule 354-D says that even if the fiber optic cable is completely dielectric (no metal parts), still it has to be 300mm away from the power cable (for maintenance and

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