Conductive fiber optic cable containing metallic components or strength members capable of transmitting stray current must be grounded when entering or terminating on the outside of buildings in compliance with 770. Alternatively, an insulating joint or equivalent device must. Fiber optic cable transmits data as light through glass or plastic strands, which means the fiber core itself carries no electrical current and requires no grounding. For electrical safety, all conductive parts of the system, including hardware, must be properly grounded and bonded. In installations where an optical fiber cable is exposed to contact with electric light or power conductors and the cable enters the building, the. While nonarmored fiber optic cables don't require grounding due to their nonconductive properties, grounding is crucial when using armored fiber optic cables. All fiber optic cables should be marked.
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