How to install the steel wire in the optical cable splice box

The steel wire (strength member) in an optical cable splice box is installed by preparing the cable, securing the steel tube, grounding, and sealing the cable entry to ensure mechanical stability and fiber protection.Step 1: Cable PreparationLeave a sufficient length of cable (typically 3 meters) for preparation and splicing at the splice box location .Clean the loose tube and reinforcing core sheath with detergent, remove excess filling, and polish the outer sheath for about 150 mm using sandpaper .If the cable has a stainless steel tube, use a tubing cutter to remove approximately 2 inches of the aluminum or steel pipe at the end, ensuring a smooth edge .Step 2: Installing the Cable into the Splice BoxSelect sealing rings that match the cable's outer diameter and slide two rings onto the cable .Insert the cable into the designated entry hole of the splice box .Connect the steel wire or shield to the grounding point inside the splice box to ensure proper electrical continuity .Wrap self-adhesive sealing tape between the two sealing rings to form a sealed cable end .Step 3: Securing the Steel WireSlide the cable retainer over the stainless steel tube and secure it in place, ensuring the steel wire is held rigidly .Use a throat hoop or cable clamp to pass through the reinforcing rib fixing seat and cable core bracket, then tighten the screws to firmly secure the cable .Tie a nylon cable tie around the cable and cut off any excess length to prevent movement .Step 4: Fiber Handling and SplicingCoil the optical fibers (typically 1.5 turns) and secure them in the splice tray using nylon ties .For single-core fibers, use a single-core buffer tube; for ribbon fibers, use a ribbon buffer tube .Perform fiber splicing according to the prescribed method, coiling any excess fiber in the tray .Cover the fusion splice tray and lock it in place, stacking trays as required by the splice box capacity .Step 5: Final SealingSeal any unused cable entry holes with plugs and wrap sealing tape around them .Ensure the lid gasket is properly seated; do not apply RTV unless specified by the manufacturer . Following these steps ensures that the steel wire is properly installed, the optical fibers are protected, and the splice box maintains mechanical and environmental integrity.