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Duct Fiber Optic Cable

Feb 09, 2022

2.1 The following preparations should be made before laying the pipeline optical cable

1) Check the position of the pipe hole occupied by the optical cable according to the design;

2) The hole position selected on the same route should not be changed. For example, when changing or turning, it should meet the requirements of the bending radius of the optical cable;

3) The pipe holes used must be cleaned.

2.2 When laying optical cables manually, each entry hole should be manned; when mechanically laying optical cables, the corner entry holes should be manned.

2.3 When the optical cable penetrates the pipe hole or the pipe turns or crosses, a guiding device or a bell mouth protection tube should be used, and the outer sheath of the optical cable should not be damaged. Apply a neutral lubricant around the cable as needed.

2.4 The length of one-time traction of optical cable is generally not more than 1000 meters. When it is too long, 8-character segmented traction or middle-assisted traction should be used.

2.5 After the optical cable is laid, it should be under the unified command of a special person to place the optical cable on the specified pallet one by one into the holes one by one, and an appropriate margin should be left to prevent the optical cable from being too tight.

2.6 The reserved length of the optical cable of the entrance hole where the connector is located shall meet the requirements in the table; the optical cable specially reserved for design requirements is too tight.

2.7 The protection measures for pipeline optical cables shall meet the following requirements:

1) The optical cable in the hole can be protected by a serpentine hose (or soft plastic tube) and bound on the cable tray or handled according to the design requirements;

2) The nozzle should be plugged;

3) The optical cable in the hole should have an identification mark;

4) In severe cold areas, antifreeze measures should be taken according to the design requirements to prevent damage to the optical cable.

2.8 The laying method of plastic sub-pipes is basically the same as the laying of optical cables, and should also meet the following requirements:

1) When laying more than two sub-pipes without color markings, the ends should be marked;

2) The ambient temperature for laying the plastic sub-pipes should be between -5°C--+35°C;

3) The length of continuous plastic sub-pipes should not exceed 300 meters;

4) The maximum pulling force of the tractor tube should not exceed the tensile strength of the tube, and the traction speed should be uniform;

5) The excess length of the sub-pipe in the entry hole should meet the design requirements;

6) For the pipe hole of the plastic sub-pipe, a plastic pipe plug should be installed (other methods can also be used) to fix the sub-pipe;

7) The sub-pipe shall not have a joint in the middle of the pipeline;

8) After the sub-pipes are laid out, the nozzles should be temporarily blocked; the sub-pipes not used in this phase of the project must be blocked (caps) at the pipe ends.


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