Tel

008673182038185

3333333
4444
22222


News

Contact Us

  1. Tel:008673182038185
  2. Email:sales@zr-fibercable.com
  3. Address:Building B, Kaixuan International, Furong District, Changsha, Hunan, China
  4. Company:Hunan Zhongruiguang Communication Equipment Co.,Ltd.

News

The minimum bending radius for the laying of leather cable

2022-12-06 16:22:56

Leather cable is commonly known as indoor suspension wiring cable. In the optical fiber access project, the indoor wiring close to the user is the most complicated link. The bending performance and tensile performance of conventional indoor optical cables can no longer meet the needs of FTTH (fiber-to-the-home) indoor wiring. Presumably you are not unfamiliar with leather wire optical cables, so, do you know what are the deployment technical requirements for the installation of leather wire optical cables?


Leather cable installation

1. What are the laying technical requirements for the installation of leather cable?

1. The laying of the leather cable should be straight, without twisting and crossing, and should not be squeezed by external force and damaged by operation. Power lines, drop-in leather optical cables and cables of other weak current systems in the building should be laid separately. If it cannot be satisfied, corresponding isolation and protection measures must be taken. For steel wire reinforced leather cable, care should be taken to ground the metal parts in the transfer box.


2. For important users or users with special requirements, protection should be considered, and different protection methods should be selected according to different situations.


3. The laying of leather wire optical cables should fully consider and strictly meet the requirements of "fire prevention, rodent prevention and extrusion prevention".


4. There should be a unified mark on both ends of the leather cable, and the position of the connection at both ends should be indicated on the mark. Label writing should be clear, correct and correct. Labels should be made of materials that should not be damaged.

leather cable

5. The turning of the leather cable should be even and smooth. The radius of curvature should be greater than 30mm when using ordinary G.652 optical fiber, and the radius of curvature should be greater than (Type A) 10mm and (Type B) 7.5mm if using anti-bending G.657 optical fiber. , (Type C) 5mm.


6. When laying the leather cable, manual traction is generally used, and the traction force should not exceed 80% of the maximum allowable tension of the leather cable. The instantaneous maximum traction force shall not exceed the maximum allowable tension of the leather cable 100N. The main traction force should be added to the reinforcement of the leather cable. After the laying of the leather cable is completed, the tension should be released to maintain a natural bending state.


7. The leather cable reel should be used to carry the leather cable, and the cable bracket should be used when laying the leather cable, so that the leather cable reel can rotate automatically to prevent the leather cable from being entangled.


8. During the laying of the leather cable, strict attention should be paid to the tensile strength and bending radius of the optical fiber to avoid the optical fiber from being entangled, twisted, damaged and trampled.


The minimum bending radius for the laying of leather cable should meet the following requirements:

(1) The bending radius of the leather cable during the laying process should not be less than 40mm;


(2) After fixing, the bending radius of the leather cable should not be less than 15mm.


9. Shaft and bridge requirements in the building:

(1) The telecommunication shaft should pass through all floors consistently up and down, and its internal width should not be less than 600mm, and the operating distance in front of the distribution box installed in the cable shaft should not be less than 0.6m.


(2) A grounding device should be reserved in the telecommunication shaft.


(3) The installation of the trunking in the shaft should be greater than 50% of the total cable utilization.


(4) The laying of the vertical part of the home optical cable in the vertical shaft should be bundled and fixed every 1.5 meters to prevent the damage to the fiber core caused by the falling force.


10. Horizontal pipe layout requirements (weak current well to user end):

(1) The diameter of the pre-embedded pipe should be φ20mm-φ25mm. The length of the straight-line pre-embedded pipe of the concealed pipe in the building should be controlled within 30 meters, and a pass box should be added when the length exceeds 30 meters. When the hidden pipe must be laid in a bend, its routing length should be ≤ 15 meters, and there should be no S-bend in this section. When the continuous bending is more than 2 times, a cable box should be installed. All turns are completed with pipe benders and are standard turning radii. Three links and four links are not allowed.


(2) The bending radius of the hidden pipe should be 10 times larger than the pipe diameter. When the outer diameter is less than 25 mm, the bending radius should be larger than 6 times the pipe diameter, and the bending angle should not be less than 90 degrees. The bending radius of the hidden pipe shall not be less than 6--10 times the outer diameter of the pipe.


11. When laying the leather cable, the reserved length at both ends of the leather cable should meet the following requirements: about 1m is reserved at one end of the floor optical splitter box; about 0.5m is reserved at one end of the user leather cable terminal box.


12. After the laying of the drop-in leather cable is completed, it should be tested with a light source and an optical power meter. The optical attenuation value of the drop-in drop cable section at 1310nm and 1490nm wavelengths should be less than 1.5dB, such as the drop-in drop cable section If the optical attenuation value is greater than 1.5dB, it should be repaired. If it has not been improved after the repair, it is necessary to re-make the optical fiber mechanical connection plug or re-lay the leather cable.


13. If the span of the outdoor leather cable exceeds 40 meters, a soft hanging method should be considered.


14. When laying the dark (bright) tube-type leather cable, firstly, when laying the dark (bright) tube, the connection at the corner of the corner should be connected with a hose or a crossing box can not be directly applied to the corner; when the straight-line distance exceeds 10 meters, it is better Install pass box.


15. In principle, the laying of the leather cable laid out in the shaft is from top to bottom. High-rise buildings or long-distance laying need to be bundled and fixed every 1.5 meters to reduce the long-term self-weight of the leather cable on the core belt. coming damage.


16. The cables of power lines, household leather cables and other weak current systems in the building should be laid out separately.


2. What are the home access methods of leather cable?

User indoor wiring

In the FTTH project, the user's indoor wiring is the most complicated link, and there are many factors to consider. It is necessary not only to ensure the safety of the line, but also to take into account the indoor appearance, and at the same time to facilitate the construction. The traditional single-core indoor optical cable can no longer meet the requirements of the indoor wiring of the FTTH project at this stage. As a substitute for traditional indoor optical cables, leather optical cables can adapt to most indoor wiring conditions, such as turning with a bending radius of 20mm, and can bear the side pressure of people stepping on the optical cable and the pulling force caused by engineering construction dragging. At the same time, with a variety of on-site connectors, on-site termination and docking can be realized in the shortest time. Therefore, leather cable is the best choice for FTTH indoor wiring.


Vertical and horizontal wiring in the building

Like the user's indoor wiring, the leather cable is also suitable for vertical and horizontal wiring in the building. Horizontal wiring is not very demanding on optical cables, but vertical wiring must require optical cables to have a certain strength of tensile properties. The leather cable can withstand a maximum short-term tension of 200 Newtons and a long-term tension of 100 Newtons, so it can ensure the construction safety and performance stability of the vertical wiring of the leather cable within a certain height range.


Self-supporting overhead entry wiring

Since the self-supporting "8" wiring cable has a metal suspension unit, it has stronger tensile performance and can withstand a span of 50 meters. The optical cable is laid outdoors in an overhead manner. Before entering the house, the metal suspension wire unit is cut off and fixed on a special holder. The remaining optical cable is stripped from the metal suspension wire and introduced into the room with a leather cable.


Pipeline home wiring

Since the pipe mapping optical cable is harder than the leather cable, the tensile strength is higher, and the optical cable contains water-blocking materials, which can reduce outdoor rain erosion, so it is more suitable for long-distance outdoor pipeline laying. The duct-mapping optical cable adopts an all-non-metal structure, thus avoiding lightning from entering the room. After the optical cable enters the home, its outer sheath, water-blocking material and reinforcement are stripped, and the middle leather cable is used for indoor wiring, which inherits all the advantages of the indoor wiring of the leather cable, and at the same time reduces the connection of outdoor and indoor optical cables.


Little knowledge about the leather cable, in fact, the leather cable is mostly a single-core or double-core structure, and can also be made into a four-core structure. The cross section is 8-shaped, and the reinforcement is located in the center of the two circles. The fiber is located at the geometric center of the figure-of-eight. The optical fiber in the leather cable adopts G.657 small bending radius optical fiber, which can be laid with a bending radius of 20mm, and is suitable for entering the building in the form of pipes or laid wires.


Leave a message

Copyright © 2005-2022 Hunan Zhongruiguang Communication Equipment Co.,Ltd. All rights reserved

Information submitted... Later, please