Precautions for Optical Cable Construction

The manufacturer has proposed the following precautions for optical cable construction:

1. Clean and test drive

Before laying the optical cable, the pipe holes should be cleaned and tested section by section. When cleaning, use specialized cleaning tools, and after cleaning, use a test rod for a test pass inspection. The inner diameter of the plastic tube should be 1.5 times the outer diameter of the optical cable. When two or more sub pipes are arranged in a cement pipe hole, the equivalent total outer diameter of the sub pipes should be less than 85% of the inner diameter of the pipe hole.

2. Place plastic sub tubes

When two or more plastic tubes are inserted, if the tubes are of different colors, the ends may not be marked. If the pipes have the same color or no color, their ends should be marked separately. The length of plastic sub pipes should not exceed 300m, and it is required that plastic sub pipes should not have joints in the middle of the pipeline. In addition, during the placement of plastic sub pipes, the ambient temperature should be between -5 degrees Celsius and+35 degrees Celsius to ensure that their quality is not affected. The plastic sub pipes that have been placed should be promptly fixed together with the cement pipes to prevent the sub pipes from sliding. In addition, the sub pipe opening should be temporarily blocked to prevent foreign objects from entering the pipe. Plastic sub pipes should have sufficient length left in the inlet holes according to design requirements.

3. Cable traction

The length of a single traction of the optical cable should generally be less than 1000m. When exceeding this distance, segmented traction or additional auxiliary traction should be adopted in the middle to reduce the tension of the optical cable and improve construction efficiency. In order to protect the optical cable from damage during the traction process, protective measures such as guiding devices or horn shaped protective pipes should be used when the optical cable passes through pipe holes, bends in pipelines, or intersects with other obstacles. In addition, neutral lubricants and other materials can be applied to the outside of the optical cable as needed to reduce the frictional resistance during cable traction.

4. Reserve surplus

After laying the optical cables, they should be placed on the designated pallets one by one in the entry holes or hand holes, and appropriate allowance should be left to prevent the cables from being too tight. When the optical cable needs to be spliced in the entrance hole or handhole, its reserved length should comply with the minimum value specified by relevant regulations.

5. Joint processing

The optical cable shall not have any joints in the pipe hole in the middle of the pipeline. When the optical cable has no joint in the manhole, it is required to bend the cable and place it on the cable tray for fixation and binding. It is not allowed to pass directly through the middle of the manhole, otherwise it will not only affect construction and maintenance, but also easily cause damage to the optical cable. When the optical cable has joints, it should be protected with serpentine hoses or soft plastic pipes, and fixed and tied on pallets.

6. Blocking and Marking

The outlet end of the fiber optic cable conduit should be tightly sealed to prevent moisture or debris from entering the conduit. Optical cables and their connections should have identification marks, indicating the number, cable model, and specifications. In extremely cold regions, anti freezing measures should also be taken to prevent optical cables from being damaged by freezing. If the optical cable may be damaged by collision, insulation boards can be installed on or around it for partition protection.