Relations between sheath thickness and quality of the cable

As we all know, the product quality, advantages and disadvantages, the first characteristic is reflected from the appearance of the product quality, no matter the product or semi-finished products, must paid attention to the appearance and the quality in production, implemente strict control and inspection. Sheath is the appearance of the Flex cable, the requirement is smooth and rounded appearance, uniform luster, unbiased core shall not exceed the stipulated deviation, no mechanical damage, flattening, perception of visible without sundry, bubble, sand holes, clear grain, bamboo, twist, etc.Sheathed in addition to meet the quality requirements, quality of cable sheath thickness also has certain influence.

Sheath thickness less than standard requirement, of course is not qualified, but the thickness is beyond standard request, it also is not qualified. For example: cable type for ZR - KVVP 4 * 1.5 was, by the measured average thickness of sheath thickness of 1.6mm, this model as reference to GB9330-88 standard request, the thickness should be 1.2mm. For the unqualified reason has the following points:
(1) Reduce the service life. When Cable laying after a long time electricity, electricity will generate heat, conductor allowed working temperature is 70 ℃, polyvinyl chloride (PVC) long-term use of temperature should not exceed 65 ℃, if in the summer, the temperature will rise, the temperature will be through the outer sheath, and sheath thickness increase, the heat is difficult to send out, then it will affect the service life of the cable, because of PVC under the action of heat, has brought a series of physical and chemical changes in the insulating layer, lost the original fine performance, cause the insulation performance significantly lower, even a short circuit, affecting the normal operation of the unit.
(2) The material performance defects. Material performance is not reflected by thickness, according to the GB8815-2002 standard requirements, one of the indicators is not up to standard and flame retardant PVC material, its oxygen index is less than 30.
(3) The control cable structure exist problems. If conductor, insulation, weave density, according to the standard control, selecting the appropriate filling material make it round, how can such sheath packed so thick?
(4) Increase the difficulty of cable laying. Now give priority to with bridge or wear tube cable laying, many companies are now in a cable tight, small diameter, has space during the installation process, send out heat, guarantee the cable outer sheath is not damaged, otherwise, bring some difficulties in the construction unit and cable laying.
To sum up, the thickness of sheath shall be in accordance with the standard controls, it can not only save resources, reduce material consumption, increase profits for the enterprise, but also can ensure the quality of cable, create a high quality and low price products.

Home Application Wire and Cable

Wire appearance consumers should pay attention to the appearance of the wire when purchase wire, it should be smooth level off, the insulation and sheath layer without damage, logo printing is clear, no greasy feeling when touch the wire. See from the cross section of the wire, the entire circumference of the thickness of the insulation or sheath of the wire should be uniform, should not be partial core, the insulation or sheath should have a certain of thickness.

Wire surface marks according to the national standard, there should be factory name, product model and continuous symbol of rated voltage on the wire surface. This is good to use the electric wire when problems occur in the process, you can find the manufacturing factory in time, it is important for consumers to note this when choose and buy wire. At the same time, when purchase wire, consumers should pay attention to if the indicated on the certificate of manufacturer name, product model, rated voltage are consistent with printing marks on the surface of the wire, to prevent counterfeit products.


Conductor wire diameter consumers should pay attention if the conductor wire diameter consistent with certificate on express section when purchase wire. If the conductor cross section is small, it will be easy to make the wire hot and cause short circuit. We suggest family lighting wire use 1.5mm2 and above specification; Larger power household electrical appliances like air conditioners, microwave ovens should use wire with power of 2.5mm2 and above specifications.

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Flexible fire retardant cable

Fire retardant flexible cables, also known as "inorganic mineral insulated cable", so it has the characteristics that more flexible than mineral insulated cable, easy to install, at present it is developing rapidly in the domestic.
Product model
BTTW corrugated copper copper sheath  Flexible inorganic mineral insulated fireproof cables, rated voltage 750v.
YTTW corrugated copper copper sheath  Flexible inorganic mineral insulated fireproof cables, rated voltage 750v.
YTTWG copper smooth copper sheath  Flexible inorganic mineral insulated fireproof cables, rated voltage 500v.
YTTWV corrugated copper copper sheath  Flexible inorganic mineral insulated PVC sheathed outside the fireproof cables, rated voltage 750v.
DW - YTTWY corrugated copper copper sheath  Low smoke zero halogen polyolefin outer sheath flexible inorganic mineral insulated fireproof cables, rated voltage 750v.

Product advantages
Excellent fireproof performance, continuous long length, cross section large, good flexible, burning smoke-free non-toxic, overload capacity large, corrosion resistance, good shielding performance, safe and reliable, long service life, simple installation, low cost of installation.

Application
1. All kinds of building fire equipment in the power supply, fire elevator power supply, etc
2. Equipment and lighting power supply system in Important building or a cluster of buildings
3. High environment temperature place, such as steel mills, smelting plant, Glass Factory, etc
4. Importance inflammable and explosive occasions, Power Supply for petrochemical industry, coal mining equipment
5. The place that need special cleaning and hygiene, such as hospitals, food factory, etc power supply equipment
6. Important military industry, national defence, aviation, satellite equipment of the power supply base
7. Important equipment power supply in power plants, nuclear power plant

The future trends of THHN cable

Wire aging is a common problem because most people for the lack of electricity, so the understanding of this aspect is not enough.
Due to aging power cord so the fundamental problem is damaged, which occurs after the leakage, and the phenomenon of power consumption, surface is, the electric meter speed is accelerated, resulting in increased power consumption, increased the cost of living, but this is not the most important, the most important thing is that, because of aging wire hides in the wall, when combined with the original wiring may cut corners, did not wear caused by pipe protection solution resulting in aspects such as wall charged, even can make the person get an electric shock, produce risk.This is very serious.

For this method, are generally choose replace the wires.But modern decoration are generally of wiring, replacing equivalent remodeling.It is relatively high costs and use a certain fixed number of year will repeat.If you do not have conditions to decorate, in order to later change with convenient also only choose cloth.But today is the 21st century, the modern years family decorate a style are also quite modern, if open wire is bound to affect the whole beautiful decoration. THHN cable will be the best choice.

Correct selection of shielded cable and not shielded cable

Screen cable and the shield, and exactly what kind of cable for copper structured cabling network provides the best solution, in the industry has been a long time. Choose unshielded twisted pair (UTP) cable and foil twisted-pair (FTP), or the United States the well-known shielded twisted-pair cable (ScTP) is not an easy decision. In fact, from a variety of options, select the appropriate shielding technology, and ensure the correct installation and operation of the technology, has been far more important than the choice of the FTP or UTP.

General practice is different all over the world. In Britain, most of Europe, the United States and Asian countries, usually the UTP cable as the most economical, and enough to satisfy most of the installation requirements of options. In Germany and other European countries, including France, Switzerland and Austria, FTP is dominant. When installing a system, one of the real problem is data integrity. The basic goal of shielding system is to prevent the potential electromagnetic interference (EMI) of data, such as industrial facilities and airports and operation key systems, such as military bases and the hospital.

Design and install the correct FTP wiring network will undoubtedly improve the signal integrity on shielding system. However, Jiansu Yafei Wire & Cable Co., Ltd alert users, in order to work efficiently, shielding grounding must be correct. In fact, this is not always easy to achieve. Bad earth shielding system will actually start using the shielding system provides worse performance levels. In the worst case, the block itself could become a radiation source, generates current grounding loop, or receive the surrounding radiation, the new data Cable of the phase led to harmful interference.

The type of shielding
Shielding is divided into several different types. Two or more conductor or four cable can pack into a whole block. In addition, the stranded cable each line also can block alone. In addition, these separate shielded cable can or can't cover the second overall shield. Whatever the design, in order to ensure effectiveness, shielding must be from end to end on the electron is continuous, and properly grounded. When choosing shielding wiring system, choose the overall end-to-end solutions is also very important. The different systems of mix component, may be caused by the impedance mismatch problem. Shielding system cost, including the required additional installation work, usually the same UTP solution for 20-30%.