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Second opening of the fiber optic splice box

Fiber optic splice closure knowledge brief Published 06 Nov 2020

Prepared for preliminary research by the RIVO OPTICAL knowledge desk. Confirm cable count, splice capacity, sealing class, tray layout, protection sleeves and installation requirements against current standards and product documentation.

The second opening of a fiber optic splice box allows additional cables to enter or exit the closure, enabling branching, splitting, or network expansion while maintaining environmental protection.Purpose of the Second Opening

Fiber optic splice closures are designed with multiple entry points to accommodate complex network configurations. The second opening is typically used for:

  • Branching or splitting connections: It allows a secondary cable to connect to the main fiber line, supporting network distribution or redundancy .
  • Network expansion: Additional fibers can be routed through the second opening without disturbing the primary cable, facilitating future upgrades .
  • Maintenance and repair access: Technicians can access fibers from multiple directions, improving flexibility during splicing or troubleshooting .
Accessing and Using the Second Opening
  1. Cable Preparation: Strip the outer jacket, armor, and shielding of the secondary cable according to manufacturer guidelines. Leave sufficient length for splicing and routing inside the closure .
  2. Sealing: Use appropriate sealing rings or grommets to maintain the closure's IP66 protection. The second opening should be sealed similarly to the primary entry to prevent moisture or dust ingress .
  3. Routing Inside the Closure: Place the secondary cable into the designated entry hole. Route fibers carefully along the splice trays, maintaining the minimum bend radius (typically 40 mm) to prevent signal loss .
  4. Splicing: Perform fusion or mechanical splicing to connect fibers from the secondary cable to the existing network. Ensure splices are organized in the trays for easy identification and maintenance .
  5. Securing the Cable: Use clamps or straps to fix the cable in place, preventing movement that could stress the fibers .
Maintenance Considerations
  • Repeated Access: Closures are designed to be opened multiple times without compromising the seal, allowing technicians to manage fibers through the second opening as needed .
  • Environmental Protection: Ensure all grommets and sealing components are intact after installation to maintain protection against water, dust, and temperature variations .
  • Documentation: Label fibers and splices clearly to track connections from both openings, which is critical for troubleshooting and future network modifications . The second opening is an essential feature for flexible, scalable, and reliable fiber optic networks, enabling branching, expansion, and efficient maintenance while preserving the integrity of the closure.

Second opening of the fiber optic splice box - RIVO MULTITRADE OPTICAL SYSTEMS [PDF]

Second opening of the fiber optic splice box

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Technical note

This reference is intended for preliminary fiber optic splice closure research. Compatibility, splice capacity, sealing class, tray layout, protection sleeves, installation methods, test limits and applicable standards must be verified for the specific project.

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