1. Cleaning and TestingBefore laying the optical cable (inquire about cable prices), clean each section of the duct hole and test passage. Use dedicated cleaning tools during cleaning, and inspect with a test rod afterward. The inner diameter of the plastic subduct should be 1.5 times the outer diameter of the optical cable. When placing two or more subducts in a concrete pipe hole, the equivalent total outer diameter of the subducts must be less than 85% of the duct hole's inner diameter.
2. Arranging Plastic SubductsWhen installing two or more plastic subducts, if they are different colors, their ends may not need marking. However, if the subducts are the same color or uncolored, both ends should be clearly marked separately. The length of each plastic subduct should not exceed 300 meters, and no joints should be present in the middle. Additionally, during installation, ambient temperature should remain between -5°C and +35°C to ensure product quality. Finished plastic subducts should be secured promptly to the concrete duct to prevent slippage. Temporarily block the openings of the subducts to prevent foreign objects from entering. According to design requirements, sufficient length of the plastic subduct should extend into the duct hole.
3. Optical Cable TowingThe main towing length of the optical cable should be less than 1000 meters. For distances exceeding this, segmented towing or auxiliary traction at intermediate points should be used to reduce cable tension and improve construction efficiency. To protect the cable’s outer layer from damage during pulling, when the cable passes through bends in the duct or crosses obstacles, protective measures such as guide devices or bell-shaped protective sleeves should be applied. Additionally, neutral lubricants or similar materials can be applied to the outer surface of the cable (check cable prices) as needed to reduce friction resistance during pulling.
4. Reserve MarginAfter laying the optical cable, place it one by one onto designated trays within manholes or duct holes, leaving an appropriate slack to avoid excessive tension. When splicing cables within a manhole or duct hole, the reserved length must meet the minimum requirements specified by relevant standards.
5. Joint ProcessingNo joints should exist in the optical cable within the duct hole. If the cable does not have connectors inside the manhole, it should be bent and placed on the fiber tray for secure bundling; direct passage through the center of the manhole is prohibited, as this would hinder construction and maintenance and increase the risk of cable damage. When the cable includes connectors, use snake-like hoses, flexible plastic tubing, or other protective materials to shield them, then place and secure them on the tray.
6. Sealing and LabelingThe outlet end of the duct hole where the optical cable is installed must be tightly sealed to prevent moisture or debris from entering. Both the optical cable and its connections must carry identification tags indicating cable number, model, and specifications. In cold regions, anti-freeze measures should be implemented to prevent cable damage due to freezing. If the cable (please inquire about cable prices) is vulnerable to impact damage, insulation boards or protective barriers can be installed around or over it for added protection.
Media Contact
Company Name: Fiber Hope Optical Communication Tech Co., Ltd.
Email: Send Email
Country: China
Website: https://www.cablefiberhope.com/
