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How to make a 24-core waterproof fiber optic splice closure

Optical network knowledge brief Published 23 Dec 2024

Prepared for preliminary research by the COETZER OPTICAL knowledge desk. Confirm compatibility, loss budgets and installation requirements against current standards and product documentation.

A 24-core waterproof fiber optic splice closure is assembled by preparing the fiber cables, installing them into the closure with proper sealing, splicing fibers in trays, and ensuring environmental protection.Materials and Tools Needed
  • 24-core fiber optic cable (singlemode or multimode)
  • Fiber optic splice closure (FOSC) rated for outdoor/waterproof use
  • Fiber optic splice trays (FOST)
  • Sealing rings, port plugs, and self-adhesive sealing tape
  • Fiber stripper, cleaver, and fusion splicer
  • Cleaning solution, lint-free wipes, and sandpaper
  • Hose clamps or cable clamps
  • Grounding hardware for metallic cables
Step 1: Cable Preparation
  1. Remove the outer jacket of the fiber optic cable, including any shielding or armor, exposing the loose tubes .
  2. Clean and abrade the exposed cable using a cleaning solution and sandpaper for about 150mm to ensure proper adhesion of sealing materials .
  3. Separate and strip fibers according to the closure's requirements, typically leaving 1600–2020mm of fiber for splicing and coiling inside the splice tray .
Step 2: Closure Preparation
  1. Open the closure in a clean, dry environment; if outdoors, use a tent or protective cover to maintain waterproofing .
  2. Install sealing rings on the cable ends that match the cable diameter .
  3. Insert the cable into the designated entry port of the closure and secure it with hose clamps or cable clamps .
  4. Seal the cable entry using self-adhesive tape between the sealing rings to prevent water ingress .
  5. Block unused ports with port plugs to maintain waterproof integrity .
Step 3: Fiber Splicing and Tray Management
  1. Place fibers in splice trays (FOST) in an orderly manner, ensuring the minimum bend radius is maintained .
  2. Splice fibers using a fusion splicer, following the manufacturer's instructions for alignment and protection.
  3. Wind excess fiber neatly inside the tray, securing it with internal tighteners to prevent stress or pinching .
  4. Stack trays carefully if multiple trays are used, ensuring fibers are not compressed.
Step 4: Final Assembly and Waterproofing
  1. Install the closure cover and tighten all fasteners according to the manufacturer's specifications .
  2. Check the sealing around all cable entries and the closure body to ensure no gaps or leaks.
  3. Ground metallic components if the cable has a shield or strength members .
  4. Test the fiber connections for continuity and signal integrity before final deployment.
Best Practices
  • Always follow the closure manufacturer's instructions for stripping lengths, sealing, and tray placement .
  • Maintain a clean working environment to prevent contamination of fibers.
  • Ensure enough slack in fibers for future maintenance or re-splicing.
  • Use high-quality sealing materials to guarantee long-term waterproof performance . By carefully following these steps, a 24-core fiber optic splice closure can be installed securely, maintaining both fiber integrity and environmental protection for outdoor or harsh conditions.

How to make a 24-core waterproof fiber optic splice closure - COETZER OPTICAL SYSTEMS (Pty) Ltd [PDF]

How to make a 24-core waterproof fiber optic splice closure

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