direct bury fiber optic cable

When performing underground cable installation, there are two methods that can be used. The first method involves placing the cable into a buried duct, and the second involves burying the cable directly underground.

Fiber optic cable installation should meet the following requirements:

1. Avoid areas with strong acid and alkali corrosion or severe chemical corrosion without corresponding protective measures, and avoid termite-hazardous areas and areas affected by heat sources or areas that are prone to external damage.

2. The optical cable should be laid in the trench, and the surrounding area of the optical cable should be covered with soft soil or sand layer with a thickness of not less than 100mm.

3. The entire length of the optical cable should be covered with a protective plate with a width of not less than 50mm on both sides of the optical cable. The protective plate should be made of concrete.

4. If the location is located in places where excavation is frequent, such as urban access roads, eye-catching marking strips can be laid on the upper layer of the protection board.

5. In the digital locations located on the outskirts of the city or in the open area, obvious azimuth signs or stakes should be erected at linear intervals of about 100mm along the optical cable path, at the turning points or at the joints.

6. When designing in non-frozen soil areas, the cable sheath to the foundation of the underground structure shall not be less than 0.3m, and the depth from the cable sheath to the ground shall not be less than 0.7m; When it is located on the roadway or cultivated underground, it should be properly deepened and not less than 1m in height.

7. When laying in permafrost areas, it should be buried below the permafrost layer. When it cannot be buried deeply, it can be buried in a dry permafrost layer with good soil drainage or back soil, and other measures to prevent damage to the optical cable can also be taken.

8. When the directly buried optical cable line crosses the railway, highway or street, it should wear a protective tube, and the protection range should exceed 0.5m above the roadbed, both sides of the street and the side of the drainage ditch.

9. When the optical cable laid directly buried is introduced into the structure, a protective tube should be installed at the penetrating slope hole, and the tube mouth should be blocked by water blocking.

10. The clear distance between the connector of the directly buried optical cable and the adjacent optical cable shall not be less than 0.25m; the joint positions of the parallel optical cables should be staggered from each other, and the clear distance shall not be less than 0.5m, and the position of the connector on the sloping terrain shall be horizontal. For the optical cable joint of the loop, it is advisable to leave a spare way to lay the optical cable at the local section starting from about 1000mm on both sides.

When direct burying fiber optic cable, special consideration must be taken in regard to the cable’s minimum bending radius, and maximum pulling strength. Further considerations include the installation temperature and preventing cables twist during the installation. Fiber optic cables should be buried beneath the frost line. This depth may vary depending on the geographical location of the installation.

Direct buried fiber cable is often used where aerial suspension or duct installation is impossible. In a direct-buried installation, the fiber optic cable is generally buried at least 24 inches beneath the surface to protect it from potential damage.

The cable is typically buried using special equipment, such as a cable plow or a trencher. Proper installation techniques and materials, such as backfilling and sand, are essential to ensure adequate protection and operation of cables.

Cable Depth: The depth to which buried cables can be placed will vary depending on local conditions, such as “freeze lines” (the depth to which the ground freezes each year). It is recommended to bury fiber optic cables to a deep/coverage of at least 30 inches (77 cm).

The best way to locate a fiber optic cable is to insert the cable pole into the conduit, then use an EMI locating device to connect directly to the cable pole and track the signal, which, if done correctly, can provide a very accurate location.

Yes. We have Fujikura, Corning SMF 28e, and other brands fiber to choose from.

Yes. As long as we confirm the Pantone color code, we can produce the sheath color you request.

Yes. We will have a dedicated process engineer to interface with you to understand the specific situation and give our production advice.

Yes. We can print company information or logos on fiber optic cables upon request.

The minimum order quantity of fiber optic cable is 1km. Because the outside diameter needs to be adjusted before producing.
This process will waste dozens of meters of raw material.

Under 100 km, it takes 4-5 days to produce. under 500 km, it takes 7-10 days to produce.

All fiber optic cables will come with a test report. If you encounter any quality problems, we replace them with new ones free of charge.

We have a special laboratory for high temperature, salt spray and vibration testing.