How to coil up excess cable at fiber optic splice closures

Excess fiber in splice closures should be carefully coiled in loops that respect the minimum bend radius, organized neatly in splice trays, and secured to prevent stress or damage.

General Principles

When coiling excess fiber in a splice closure, the main goals are to avoid sharp bends, prevent fiber stress, and maintain a tidy layout for future maintenance. Each fiber should be coiled individually or in small groups, following the closure manufacturer's instructions for tray placement and bend radius limits.

Step-by-

Step Coiling Method

Preprocess the Fiber: Strip the cable jacket and prepare pigtails or buffer tubes according to the closure specifications. Reserve the correct fiber length for splicing and coiling. Splice the Fibers: Complete fusion or mechanical splicing, then protect the splice with a heat-shrink sleeve or splice protector.

Coil the Fiber: Single Loop per Splice: Coil each fiber once after splicing and heat-shrinking to avoid tangling and maintain a neat layout. Middle First, Then Sides: Place the heat-shrunk sleeves in the tray first, then coil the remaining fiber on both sides. This method protects the splice and is useful when tray space is limited.

Start from One End: Alternatively, coil from one side, fix the splice, and then coil the remaining fiber to the other side. This is flexible and prevents sharp bends. Special Cases: If fibers are unusually long or short, coil them separately and use buffer pads to prevent crushing or pinching.

Special device pigtails should not be excessively long. Placement in Splice Tray: Arrange fibers in the tray slots or compartments, ensuring no fiber is pinched when stacking trays or closing the cover. Twisting fibers slightly may be necessary, but always follow the manufacturer's guidance to minimize stress.

Final Check: Ensure all fibers are neatly coiled, splices are protected, and the closure can be sealed without forcing fibers. Proper labeling and organization facilitate future maintenance.

Tips for Best Practices

Respect Minimum Bend Radius: Never bend fibers tighter than the specified radius to prevent signal loss or breakage. Avoid Bird's-Nest Coiling: Coiling should be orderly; tangled fibers increase the risk of damage and complicate maintenance.

Use Closure-

Specific Hardware: Some closures have grooves or clips to secure coiled fibers; always use them to maintain stability. Plan Fiber Length: Calculate reserved lengths carefully before splicing to ensure enough slack for coiling without excess loops. By following these steps, excess fiber can be safely coiled in splice closures, ensuring low insertion loss, long-term reliability, and easy access for future moves, adds, or changes.