Where should the ground or interruption be located when entering a building with optical fiber cables and non-current carrying metallic members?

When installing optical fiber cables and integrating non-current carrying metallic members into a system, it is essential to ensure proper grounding to safeguard the integrity of the communication systems and to manage electrical surges effectively. The optimal location for a ground or interruption is as close as possible to the point of entrance.

Placing the ground near the entrance minimizes the length of ungrounded cable, thereby reducing the risk of induced voltages from external electrical sources or lightning strikes which could compromise the integrity of the optical fibers. This proximity ensures that any potential surges are directed into the ground effectively before they can affect the equipment housed inside the building.

Positioning the ground near the point of entry also facilitates better bonding and grounding practices, as it aligns with the requirements outlined in various electrical codes. This practice helps in maintaining safety and functional integrity in the system, which is critical when working with sensitive optical fiber installations that can easily be disrupted by electrical interference.

The other options, while they may have relevance in specific contexts, do not address the priority of grounding at the entry point, where the risk of external interference is greatest. Thus, the most effective strategy is to establish a grounding point as close to the entrance as possible to ensure maximum protection and operational reliability.