What are the methods for splicing steel-armored optical cables

Splicing steel wire armored (SWA) fiber optic cables requires careful preparation, specialized tools, and protective measures to maintain both mechanical integrity and optical performance.Understanding Armored Fiber Optic CablesSteel wire armored (SWA) fiber optic cables consist of fiber cores encased in loose tubes, surrounded by strength members (like Kevlar), and protected by a metallic steel wire armor with an outer jacket. This construction provides mechanical protection, rodent resistance, and durability for harsh environments, including underground or outdoor installations .Tools and Materials NeededFiber strippers for removing acrylate or polyimide coatings Heat shrink tubing and stainless steel (SS) tubes for sealing the splice Abrasive cutoff wheel or scissors for cutting armor and strength members Clamps or vises to secure the cable during preparation Optional: In-line splice kits like TE's Raychem HVSA-3 for 3/C armored cables, which rebuild all layers of the cable including the armor .Splicing Procedure OverviewPrepare the Cable Ends: Cut the cable to the desired length and slide heat shrink tubing and SS tube over the cable before exposing fibers .Strip the Armor and Jacket: Carefully remove the steel wire armor and outer jacket to expose the inner fibers and strength members. Cut Kevlar and wires close to the jacket using scissors or an abrasive wheel .Prepare the Fiber: Strip the fiber coating (polyimide or acrylate) using a fiber stripper, then clean with alcohol and lint-free wipes .Splice the Fibers: Use fusion splicing or mechanical splicing techniques to join the optical fibers, ensuring minimal signal loss.Rebuild the Armor and Seal: Slide the SS tube over the splice and apply heat shrink tubing to restore mechanical protection. For multi-core armored cables, in-line splice kits can rebuild the armor layer and provide a sealed, durable joint .Test the Splice: Verify optical performance and mechanical integrity before final installation .ConsiderationsMaintain tensile strength: Ensure the splice does not compromise the cable's ability to withstand pulling forces .Environmental protection: Use gel-filled tubes or heat shrink seals to prevent moisture ingress .Safety: Wear protective gloves and eye protection when cutting steel armor.Training: Manufacturers like TE provide installation training for specialized in-line splice kits to ensure proper handling and performance . By following these steps and using appropriate tools and splice kits, steel wire armored fiber optic cables can be safely spliced while maintaining both optical performance and mechanical protection.