How should optical fiber cable metallic members be interrupted when entering a building?

Optical fiber cable typically includes metallic members for structural support, which may also serve a grounding purpose. When these cables enter a building, it is crucial to interrupt the metallic members appropriately to avoid electrical hazards, ensure safety, and maintain the integrity of the optical fiber function.

Using an insulating joint is the correct approach as it effectively separates the metallic elements from the building's grounding system. This interruption prevents any electrical faults from the external environment from affecting the internal systems. Insulating joints are specifically designed to ensure that there is no direct metallic connection between the outside and inside, thereby enhancing safety against electrical surges, shorts, or lightning strikes.

The other methods presented, such as using an extension cord, directly grounding the metallic members, or using electrical tape do not adequately provide the necessary protection or isolation. An extension cord introduces additional wiring that could complicate the system and create risks. Grounding them directly contradicts the purpose of the interruption, as it creates a potential pathway for electrical issues between the external and internal systems. Likewise, while electrical tape could temporarily cover a connection, it does not offer a reliable or permanent solution for proper interruption and safety compliance.