Sealing sequence of optical cable splice closures

The sealing sequence of optical cable splice closures involves preparing the cable, securing it with gaskets and clamps, arranging fibers in trays, and finally closing and locking the enclosure to ensure a watertight and dustproof seal.

Step-by-Step Sealing Sequence

1. Cable Preparation

• Mark the cutting point on the cable and strip the outer jacket to the length recommended by the closure manufacturer, typically around 120 cm for space-limited closures .
• Carefully remove the cable sheath without cutting, twisting, or damaging the loose tubes or fibers .
• Reserve enough fiber length for splicing and future maintenance .

2. Cable Entry and Fixing

• Lead the stripped cable into the designated port of the closure (round ports for branch cables, oval ports for direct cables), .
• Secure the cable using the metal hoop or fixing clamps provided, ensuring the armored layer and steel core are properly fixed .
• Select the appropriate sealing gasket according to cable diameter and type, and insert it into the port in the correct order .

3. Fiber Splicing and Tray Arrangement

• Splice fibers according to network design and place them neatly in the splice trays .
• Arrange fibers to avoid stress, pinching, or excessive bending; follow manufacturer instructions for twisting or coiling fibers inside trays .
• Secure buffer tubes and ribbons in the closure to prevent movement .

4. Sealing the Closure

• Depending on the closure type, use the recommended sealing method: heat-shrink, gel-based, or mechanical .
  • Heat-shrink: Apply heat to shrink the sleeve tightly around the cable for a durable, waterproof seal .
  • Gel-based: Insert gel material to fill gaps and adhere to the cable surface, providing flexibility and moisture protection .
  • Mechanical: Tighten screws or clamps to compress gaskets and achieve a watertight seal .
• Ensure all metallic components are grounded if required .

5. Closure Locking and Mounting

• Close the cover carefully, ensuring proper alignment and superposition .
• Lock the closure using nylon ties, padlocks, or bolts as specified .
• If wall-mounted, drill expansion holes, insert nuts, and secure the closure with bolts .

6. Final Inspection

• Verify that all fibers are properly stored, no stress is applied, and the closure is fully sealed .
• Check for proper strain relief and that the closure is watertight and dustproof, ensuring long-term network reliability .

Following this sequence ensures that the optical cable splice closure provides maximum protection against environmental factors, maintains fiber integrity, and allows for future maintenance or re-entry if necessary.