Wire and cable jacket knowledge-Henan Sanheng Industrial Co.,Ltd

Wire and cable jacket knowledge

May 15,2018

The industry has always been arguing about the characteristics of the network data cable sheath, such as whether the skin can meet the flame-retardant or low-smoke standard, whether it needs to have a high ignition point, fire resistance, but it will release toxic gases in the fire. Halogen? Network cabling professionals, a large number of network users, and even between different standards organizations in different regions, there are differences. With the advent of integrated multimedia, broadband, and converged network eras with integrated voice, data, and graphics, network cabling will continue to expand into millions of households. It will correctly understand the composition and characteristics of network data cable jackets, and will help the future network construction. The work and life of both the user and the user are very important.

Wire and cable jacket knowledge

For the selection and standardization of network data cable jackets, North American and European standards organizations and manufacturers are just like they used to use UTP or FTP shield products. At present, North America, South America, Asia Pacific, and China all adopt North American-based cable fireproof standards UL and NEC (National Electrical Code). In some parts of Europe, low-halogen or low-smoke, halogen-free, green and environmentally friendly cable standards are used.

Halogen-containing skins

At present, power and communication cables installed in most parts of the world contain halogens, which emit toxic aerosol-like chemicals when burned. In the fire, the halogen-containing cable generates acid gas, which can damage the nose, mouth and throat of the workers. The smoke also makes it easy for the victim to get lost and it is difficult to escape from the scene of the fire.

Recognizing this potential hazard, some European countries have used halogen-free cables as the standard for power and communication cables. However, the National Electrical Code of the United States clearly stipulates that the communication network must use a Category 5 or Category 6 UTP (unshielded twisted pair) network cable with a halogen-containing cladding. This is because although the halogen-containing cable has important defects, the halogen itself has a strong flame resistance and a high ignition temperature. If the cable does not catch fire at all or it is difficult to ignite, it will not cause burning and emit toxic fumes. .

In fact, some fires are caused by overheating of the cable itself for a long period of time. Halogen-free cables are more likely to cause fire due to their low flash point, and halogen insulation can better prevent the cables from spontaneous combustion. However, if the cable is already in the fire, the smoke it produces can cause life poisoning. These above-mentioned contradictions have been the focus of debate in the industry for halogen applications.

Today, cable halogen advocates, including U.S. Federal companies and Goodrich, dominate the technology. Opponents of halogens are expected to be better able to persuade the NFPA (American Fire Protection Association) to modify current standards, stop using halogens or allow the use of halogen-free cables in the ventilation of buildings.

Wire and cable jacket knowledge

This is not the first time that halogen-free cable advocates have attempted to modify standards, but so far have been unsuccessful. The main reason is that the self-combustion of the cable in the main trunking makes it difficult for people to conduct zone fire control, which can cause fire in the entire building, and the low ignition point can easily cause fire. The other main reason is that there is no evidence that the halogen-free cable can really save lives (because there are a lot of other decorations in the house also contain halogens).

According to the current US Construction Act, the only halogen-free cable that can be legally installed is to place the cable in a metal conduit, which doubles the cost of the entire wiring system. Therefore, most European countries, including France, Italy, and the United Kingdom, have turned to the use of halogenated cables. In the European communication cable, halogen-free cables currently account for about 25% of the total, while in North America and most of the world, there are more than 98% of the market for halogen cables. Avaya, a cabling manufacturer, has introduced a full range of data cable solutions for different standards and users in different regions to meet the needs of different users.

Halogen-free advantages

Halogen-free characteristics are: low ignition temperature, easy to burn but low toxicity. The current international standards related to cables mainly focus on three issues: fire resistance (speed of cable burning), smoke density (how much visible smoke is produced) and toxicity (how much damage to the human body). The US fire protection standard only addresses the first two issues, but it is more widely used and stricter. To meet US standards, halogen must be added to the polymer of the cable insulation. The PVC cable contains chlorine, and FEP (Teflon). Teflon PTFE cables contain fluorine.

FEP is highly fire-resistant and can withstand temperatures of up to 800°C before the disintegration of smoke, which is several times higher than a typical halogen-free cable, and FEP is also a highly efficient insulator. Therefore, FEP is very suitable for making cables that transmit high-speed data, and is a key factor in the widespread use of ultra-quintile UTP in ventilated areas. In high-rise shafts and other ventilated areas, FEP cables have largely replaced PVC cables. In some European countries, the standards are different. In order to comply with stringent anti-toxicity regulations, cable manufacturers do not use halogen and instead add metal to the polyethylene and polyalkene cable insulation. When heated, this cable emits only minimal visible vapor. However, this halogen-free cable is not as flame-retardant as the halogen-containing cable, and its insulation will soon burn. Therefore, halogen-free cables cannot meet stringent US fire safety standards. To meet the fire protection requirements at the ventilation and exhaust level levels, excessive amounts of metal hydroxides have to be added, affecting cable performance and technical requirements.

Competition for cable toxicity

Hydrogen fluoride and dioxide gas are emitted when the PVC cable is burned. They are identified by Greenpeace as "scientific and toxic synthetic chemicals." When the FEP cable burns, it releases colorless, odorless hydrogen fluoride that is more toxic than hydrogen chloride. Tests have shown that there is another dangerous gas in FEP smoke. This super toxin has never been correctly recognized by humans, and research on it has now ceased. However, some people think that this super toxin is only an experimental product and does not exist in reality.

Henan Sanheng Industrial Co., Ltd. , founded in 2000, It is one of the top wire and cable manufacturers in China's wire and cable industry for nearly 20 years. the company has more than 5 production lines., founded in 2000, It is one of the top wire and cable manufacturers in China's wire and cable industry for nearly 20 years. the company has more than 5 production lines.

The production cable can be divided into more than 50 varieties and subdivided into 1000 specifications.All products have passed national certification, such as China compulsory certification, bv certification, Nigerian SONCAP certificate, China national industrial certification, etc. China national industrial production license, etc.It also has the ability to produce products that meet international standards, such as iec, ce, rohs, etc.
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