The cable sheath should not be too thin, not too thick, how to be qualified

Only qualified by the insulation withstand voltage standard!

Summary. Hello dear, the average thickness of the cable sheath is not enough, and the thinnest point is up to standard.

Hello dear, the average thickness of the cable sheath is not enough, and the thinnest point is up to standard.

The thickness of the cable sheath must reach the thinnest point to meet its set requirements, because the thickness of the sheath determines its overall strength, and the strength is conducive to prolonging the life of the cable, and the hole digging will also affect the start-up performance, safety and reliability of the system. If the thickness of the sheath is not enough to meet the thinnest point, it will cause the cable sheath to be damaged, and the fuse will continue, causing the cable to short circuit, which will cause system failure and safety hazards. Therefore, the thickness of the cable jacket must be high enough to reach the thinnest point to meet the requirements for system performance, safety and reliability.

It is also important to install the cable sheath correctly, it must be aligned with the exact location and the specified cable to avoid voids in the cable, which can cause damage to the cable sheath and affect the insulation performance of the cable system, for example. The operation of the system will also be due to the quality of the cable sheath, which requires the thermal performance and weather resistance of the sheath, as well as the type of cable sheath, so as to ensure the performance and reliability of the sheath.

Generally, the thinnest point of the sheath is up to standard.

Generally, the thinnest point of the cable sheath may not meet the standard. Depending on the cable and application, the final sheath should be of different thicknesses to ensure safe and reliable performance, otherwise it may lead to power outages, missing round date barriers, sparks and other problems. The thickness of the chamber cover should be determined according to the safety requirements and factors including environmental conditions and use occasions, and it is best to install it by a professional electrician to ensure electrical safety.

In addition, when choosing a cable sheath, in addition to the thickness, it is also necessary to pay attention to the choice of material. Generally speaking, the cable sheath should be heat-resistant, age-resistant, corrosion-resistant, anti-aging, and weather-resistant, which can effectively ensure low noise, short circuit and other electromagnetic compatibility problems, and ensure the safe use of the cable.

The average thickness of the force cable is actually not enough, but the thinnest point is enough.

This is not recommended, and even if the thinnest point is sufficient, the cable force can still be stressed, causing it to crack or break, leading to unforeseen consequences. In order to ensure that the cable is fully used, the best thickness is not less than. In addition, it is recommended to install in strict accordance with the relevant regulations provided by the manufacturer in the product technology sensitive cavity document on the performance and best thickness of the cable material.

We are happy to answer for you whether the average thickness of the cable sheath is not enough to meet the thinnest point: Hello, the average thickness of the cable sheath is one of the important factors to ensure the safe operation of the cable. If the average thickness of the cable sheath is not strong enough, the protective performance of the cable will be affected, which may lead to damage and safety hazards of the cable.

Therefore, even if the thinnest point meets the standard bridge stool, the average thickness of the cable sheath is not enough. First of all, the average thickness of the cable sheath is stipulated according to national standards and industry standards, if it does not meet the requirements of the standard, then the safe operation of the cable cannot be guaranteed. Secondly, during the use of the cable, it will be affected by various external factors, such as mechanical damage, chemical corrosion, ultraviolet radiation, etc., if the average thickness of the cable sheath is not enough, then the cable is easily damaged by these effects.

Therefore, in order to ensure the safe operation of the cable, the average thickness of the cable sheath must meet the requirements of the standard. If it is found that the average thickness of the cable sheath is not enough, it should be replaced or repaired in time to ensure the safety performance of the cable.

The main function of the outer sheath of the cable is to strengthen the insulation properties and at the same time protect the cable from mechanical damage.

The standard of the outer sheath of the cable, the thickness of the sheath is controlled according to the standard, and the calculation formula is: d (outer diameter before extrusion) The thinnest point of the single-core sheath: 85% of the nominal value; Thinnest point of multi-core housing: 80% nominal.

The cable sheath is the outermost layer of the cable, such as VV is PVC insulation, PVC sheath. The tube worn on the outside is called a protective tube.

High-density polyethylene. Compared with MDPE (medium density polyethylene) and LD LLD (low density linear low density), HDPE material has a regular molecular chain structure, molecular chains have fewer branched chain structures, and the branches are shorter, the molecular chains are neatly arranged, the distance between molecular chains is small, and the intermolecular forces between molecular chains are large.

The black high-density polyethylene material used as the sheath material is made by using the high-density polyethylene base resin for the sheath material, adding high-quality carbon black masterbatch and other related processing aids, and mixing and granulating. Factors such as high-quality carbon black masterbatch content, carbon black particle size, and dispersion have a great impact on the long-term performance of optical cables such as ultraviolet radiation aging resistance and heat aging resistance.

The special HDPE sheath material for the cable used by BJCCS, the selection of its base resin, the carbon black content, the carbon black particle size and the dispersion, etc., all have a high degree of stability and reliability, and have its unique advantages in ensuring the physical and mechanical properties of the optical cable, adapting to the laying conditions, environmental aging, and ensuring the reliability of operation and long-term service life.

Insulation. There should be a rule, you have to search the Internet. It's like a bad faucet doesn't save money.

There are many ways to check the quality of cables, and the thickness of the cable sheath is also one of its standards. While cable sheathing and cable quality are not directly related to raw materials such as copper and aluminum, the thickness of the cable sheath is often the best indicator of the cable manufacturer's production level. Currently, there is a saying that "the thicker the cable jacket, the better the product quality".

Is this true?

Of course, if the thickness of the sheath is lower than the standard requirement, it is unqualified, but if the thickness exceeds the standard requirement, it is also unqualified. For example, the cable model is ZR-KVVP4*, and the average thickness of the sheath measured is mm. If the model meets the requirements of GB9330-88, the thickness should be mm<>

The thickness of the sheath determines the life of the cable: the cable needs to operate for a long time, and the laying environment is special, especially in some environments that need to be directly buried, immersed in water or exposed to air and prone to corrosion. Due to the long-term corrosion of the cable by external media, the insulation level and mechanical level of the thinnest point of the sheath will be reduced.

In addition, conventional sheath testing or line ground faults will not cause the thinnest point to break down. However, the protective effect of a cable sheath is directly related to its thickness, and the thin points of the sheath usually lose their protective effect first. In addition, we cannot ignore the internal consumption of the cable.

Wires and cables with long-term electrification will generate a lot of heat (the allowable operating temperature of the conductor is 70, and the long-term use temperature of PVC should not exceed 65). Since the cable is in the case of "internal and external faults", the sheath plays a good protective role, so the thickness of the sheath determines the service life of the cable to a certain extent. <>

The reasons for judging that the cable sheath is unqualified are as follows:

After the cable is laid, it will be energized for a long time to generate heat energy. The permissible working temperature of the conductor is 70, and the long-term service temperature of polyvinyl chloride should not exceed 65. If the operating temperature rises in the summer, these temperatures will be dissipated through the outer sheath, and the thickness of the sheath will increase, which will make it difficult to dissipate heat energy, thus affecting the service life of the cable.

There is a problem with the cable construction: how can the sheath be squeezed so thickly if the density of the conductors, insulation and braid is controlled according to the requirements of the standard, and the appropriate filling is selected to round it? <>

Therefore, the thicker the cable jacket, the better the quality.

No, the sheath is used to protect the inside of the structure from damage and maintain normal use, and the excessively thick sheath layer is not conducive to the heat dissipation of the cable, causing internal damage.

It is not that the thicker the cable sheath, the better the quality, it still depends on the material from which the cable is made, if the material is more expensive, the better the quality.

No, the thickness of the cable sheath is related to the quality, but it is also very related to the material used.

Cable sheath are national standards, as long as they meet the national standards, they are qualified, according to GB T12706 Appendix A assumed diameter algorithm, sheath thickness t = sheath before the assumption of outer diameter) + 1,

The quality of wires and cables, the first feature is reflected from the appearance quality of the product, no matter what kind of product, or semi-finished products, we must pay attention to the appearance in production.

quality, which is strictly controlled and inspected. The sheath is the appearance of the cable, and its appearance requirements are smooth and round, uniform gloss, no deviation (not more than the specified deviation), no mechanical damage, flattening, no visible debris, bubbles, sand holes, obvious particles, bamboo shape, twist shape, etc. In addition to meeting the above quality requirements, the thickness of the sheath also has a certain impact on the quality of the cable.

The thickness of the sheath is lower than the standard requirements, of course, it is unqualified, but the thickness exceeds the standard requirements, it is also unqualified. For example, the cable type is ZR-KVVP 4*, and the average thickness of the sheath is measured.

degree, if this model refers to the requirements of GB9330-88 standard, the thickness should be. The reasons for its disqualification are as follows:

1) Reduced service life. After the cable is laid, it will be energized for a long time, and the electricity will produce heat energy, the allowable working temperature of the conductor is 70, and the long-term use temperature of PVC should not exceed 65, such as.

In summer, the operating temperature will rise, these temperatures will be emitted through the outer sheath, the thickness of the sheath will increase, and the heat energy will be difficult to dissipate, which will affect the service life of the cable, because PVC is hot.

Under the action, a series of physical and chemical changes occur in the insulation layer, which loses the original excellent performance, resulting in a significant decline in insulation performance, and even a short circuit, which affects the normal operation of the unit.

2) Defects in material properties. The material performance is not reflected by the thickness, according to the requirements of the GB8815-2002 standard, then one of its indicators is not up to standard, flame retardant PVC material, then its oxygen index is less than 30.

3) There is a problem with the cable structure. If the conductor, insulation, and braiding density are controlled according to the requirements of the standard, and the appropriate filler is selected to make it round, how can the sheath be so thick?

4) Increase the difficulty of cable laying. Now the cable laying is mainly based on the bridge or through the pipe, and now many enterprises are implementing the tight cable requirements, the outer diameter is small, and there can be gaps in the laying process, dissipate heat energy, and ensure that the outer sheath of the cable is not damaged, otherwise, it will bring certain difficulties to the construction unit and cable laying.

To sum up, the thickness of the sheath should be controlled in accordance with the standard, which not only saves resources, reduces material consumption, increases profits for enterprises, but also ensures the quality of cables and creates high-quality and low-cost products.

There is a relationship, such as YJV (cross-linked polyvinyl chloride insulation) cable, and the quality and thickness of the insulation material are related, otherwise it will not reach the specified insulation voltage level.