Seven requirements for high-quality flexible cables

1. Tensile Center

According to the number of flexible cores and the space of each flexible core crossing area, the center of the cable should try to have a true center filling line (rather than the garbage core filled with some filler or waste as usual). This method can effectively protect the structure of the stranded wire and prevent the stranded wire from moving freely to the center area of the cable.

 
2. Core strand

The softer the core wire, the better the core wire structure. The conductor is made of ultra-fine oxygen-free fine stranded copper wire.

 
3. Core insulation

The insulating materials in flexible cables must not be bonded to each other. At the same time, the insulation layer should support each individual wire. Therefore, only the best high-pressure PVC / TPE materials can be used in the multi-million-meter cable of the energy chain to prove its reliability and durability.

 
4. Stranded structure

The flexible cable strand structure must be wound on a stable tensile center with a good twisting pitch. However, due to the use of insulating materials, the steel strand structure should be designed according to its movement characteristics. When the number of cores ≥12, bundle twisting method should be used.

5. Inner sheath

The extruded inner sheath of the flexible cable replaces the cheap wool material or other fillers to ensure that the strand structure is not dispersed.
 
6. Shield

Highly flexible cables tightly braid the shielding layer outside the inner sheath through optimized braid angles. Loose weave will reduce the anti-interference ability of the signal, and the shielding layer will soon fail due to the shielding wire breaking. The tightly woven shield layer also has the properties of torsion resistance and torsion resistance.

 7. Outer sheath

The outer sheath made of different improved materials has different functions: UV resistance, low temperature resistance, oil resistance and high cost performance. But they all have one thing in common: high wear resistance and no adhesion. The outer sheath must have high flexibility and support function, so it must be extruded under high pressure.

 What are the advantages of drag chain cables over RVV cables?

 
1. The drag chain cable is more flexible than the RVV cable

The single conductor diameter of the cable conductor of the towline cable is small, but in order to protect the conductor, an insulating material with certain resistance to mechanical fatigue and certain strength is selected, which has certain hardness and flexibility. Therefore, the flexibility of the towline cable is high flexibility, not high flexibility. This is not available with RVV cables.

 2. Material selection of towline cable is better than RVV cable

The towline cable conductor uses high-purity oxygen-free copper wire with bright colors and regular appearance. The material is raw material with high strength and good bending and tear resistance. Because RVV has low fraud, the corresponding material specifications and quality are not as good as towline cables.

 
3. The service life of towline cable is longer than that of RVV cable

The bending radius of the drag chain cable is very small. When the moving speed is fast, the drag chain cable can still be used, and sometimes the RVV cable cannot be used at all. Even in environments with large installation radius, slow speed, and low frequency, there is a large gap between the bending life of the towline cable and the bending life of the RVV cable. This is caused by the manufacturing process and materials.

Precautions for cable installation and wiring

 1. The cable can only be used if it is not directly exposed to the sun or high temperature. It is recommended to use pipes. Ultraviolet (UV)-Do not use cables without UV protection in direct sunlight.

 2. On the outer wall. It is forbidden to expose the wall to direct sunlight and man-made damage. Heat—The temperature of the cable in a metal conduit or trunking is very high, and many polymeric materials will reduce their service life at this temperature.

 3. In the pipeline (plastic or metal). For example, in pipelines, attention should be paid to the destruction of plastic pipes and the heat conduction of metal pipes. Machine damage (maintenance cost)-The maintenance cost of the optical cable is very expensive. Each breakpoint requires at least two terminations.

 
4. Suspended applications / overhead cables. Consider cable sag and pressure. Whether the cable is directly exposed to sunlight.

 
5. Lay directly in the underground cable trench, the environment is the smallest within the control range. The installation of cable trenches should be regularly checked for dryness or humidity. Grounding—If the shield of the control cable needs to be grounded, it must be in accordance with the corresponding scale.

 
6. Underground pipeline. In order to facilitate future upgrades and isolation from ground pressure and the surrounding environment, auxiliary pipelines are a better measure. But don't expect the pipeline to stay dry forever, this will affect the choice of cable type. Moisture in the LAN twisted pair will increase the capacitance of the cable, reduce impedance and cause near-end crosstalk problems.