China Zhenglan Cable Technology Co., Ltd Company News

What happens if the cable insulation thickness is not standard? First, too thin: It will reduce the service life of cable products After long-term operation, directly buried, immersed in water, exposed to air or easily corroded environment, the thinnest point of the insulation may broken down due to corrosion of the external medium for a long time. In addition, the long-term electrification of cable will generate a large amount of heat, the conductor is allowed to work at 70 ° C, and the long-term use temperature of PVC should not exceed 65 ° C.   Second, too thick: It will increased the difficulty when install At present, more and more environmental require high-voltage cable products to have a small outer diameter. In the process of installing, it is necessary to consider leaving space which could dissipate the heat generated .Too thick insulation will also increase the difficulty when installing. So that it should be strictly according to relevant standards, otherwise it can not protect cable.    

1. The product name identification method for the identification method of low-smoke halogen-free flame-retardant wires. Wire--Low-smoke halogen-free flame-retardant polyethylene insulated wire and cable; cable--low-smoke halogen-free flame-retardant polyethylene insulated low-smoke halogen-free flame-retardant polyethylene sheathed power cable. Imitations generally have a different name, such as polyethylene insulated low-smoke halogen-free sheathed flame-retardant power cables.   2. The method of identifying the low-smoke halogen-free flame-retardant wire by the method of skin burning. There should be no obvious depressions in the insulation layer with an electric iron. If there is a large depression, the material or process used in the insulation layer is defective. Or use a lighter to grill, under normal circumstances should be not easy to ignite, the insulation of the cable is still relatively complete after a long time of burning, no smoke and irritating odor, while the diameter has increased. If it is easy to ignite, it can be determined that the insulation of the cable is not using a low-smoke, halogen-free material (most likely polyethylene or cross-linked polyethylene). If large smoke is present, the insulation is a halogen-containing material. If the insulating surface is severely detached after a long period of burning and the diameter is not significantly increased, it indicates that the appropriate irradiation crosslinking process has not been performed.   3. Hot water immersion method for identifying low-smoke halogen-free flame-retardant wires. The core or cable is immersed in hot water at 90 ° C. Under normal conditions, the insulation resistance does not drop rapidly and remains above 0.1 MΩ/Km. If the insulation resistance drops rapidly or even lower than 0.009 MΩ/Km, it indicates that it has not been treated by a suitable irradiation crosslinking process. (Polyethylene or XLPE insulation materials are not suitable for this method and can be identified by the method described in the second paragraph above).   4. The density comparison method for the identification method of low-smoke halogen-free flame-retardant wires. The low-smoke halogen-free material has a higher density than water, and can be stripped of a little insulating layer into the water. If it floats above the water surface, it is certainly not a low-smoke halogen-free material. If you want to know other knowledge about cables or wires,please leave your doubts below, we will update in future.            

Commonly known as SWA (Steel Wire Armored) is a power cable that is commons in the mains grid architecture of power supply companies. Commonly, you can use underground and for cable trunks. The armored power cables, judging from their name, are coated with unreactive material to protect them from mechanical damage judging from the environments in which they are commonly found.   The armoring material is often hard enough to protect the inner cable from damage. And armored cable for sale also flexible for a variety of applications. There are a number of advantages that come with using armored cables: 1. Temperature resistance of Armoured cable The melting point of steel is approximately 15000 C which is way higher than those of aluminum and copper. It is approximately 6000C and 10000C respectively. This means that the steel armoring goes a long way in protecting the electrical carrying components against extreme temperatures. Hence durability of transmissions using cable components that are armored with steel. This makes the armored cable a suitable solution for industries. They manufacture these cables as they are exposed to extreme variations of temperature. 2. Advanced mechanical properties of Armored Power Cable Cables that are used in large industrial applications often have a lot of challenges during transmission. Both electrical and network cables are meant to be used over long distances. It exposes them to a lot of mechanical threats. These cable are either placed underground or overhead and whichever the case they are exposed to mechanical damage. Armored cables are able to protect the inner components of the cable. You can use actual transmission from being damaged by different external factors thus hindering transmission. This ensures both power and network availability for the desired applications and hence making armored cables a reliable way of transmission. 3. Electromagnetic Interference (EMI) Now that we have cables that are used for the mains grid, interference from fellow cables and other electrical appliances that are in the path of the transmission line is common occurrence. Because of the amount of power being transmitted. Using armored cables helps in insulating the transmission components from emitting the interference. And also from being affected by interferences that are being emitted from neighboring cables and also appliances. This is accordance to the EMC (Electromagnetic compatibility) regulations that have been set by a number of institutions in various regions to ensure that all appliances and cables can coexist in the same environments. You’d better use armored cables in fixing conduit pipes. They are support to transport large volumes of water over long distances, wiring that is done in locations that pose a great danger to the cables. And their components like places with extreme weather and where the cables are susceptible to mechanical damage and places that high numbers of radio frequencies. They are so likely to cause interference to transmissions cables used. Finally, after you know the advantages of armoured cable, you can feel free to buy it. And many China steel wire armoured cable prices are reasonable. You can try to search several on the web.：http://www.zhenglancable.com          

There’s a huge range of cable types and associated cable acronyms. Here’s a brief overview of some of the most common cable acronyms and what they refer to. PVC PVC (Poly Vinyl Chloride) is a synthetic plastic material which is the most common material used for cable insulation and outer jacket. It’s widely used for both control and low voltage power cables. V-75 / V-90 / V-90HT PVC cables are available in various temperature ratings including V-75 (75°C), V-90 (90°C) and V-90HT. The higher ratings can continually withstand higher temperatures, but only in certain conditions where they are mechanically protected. PVC tends to soften at high temperatures which can increase the risk of mechanical damage and subsequent safety hazards. In the case of a fire, PVC emits toxic fumes and smoke which can become very hazardous to persons in a confined space. LSF LSF denotes Low Smoke and Fume – a special type of PVC cable insulation which is designed to emit much less noxious fumes and smoke in the case of a fire or high temperature situation. It’s often used in public areas and confined spaces such as underground railway stations, where the potential likelihood of toxic fume inhalation is higher. XLPE XLPE is an abbreviation for Cross(X)-Linked PolyEthylene – a polymeric insulation material primarily used in power cables. It offers a higher temperature rating than PVC – typically 90°C – but doesn’t soften like PVC at these temperatures, so is much safer and capable of carrying higher currents. SDI SDI stands for Single Double Insulated. It’s simply a single conductor with two separate layers of insulation for additional protection. SWA SWA stands for Steel Wire Armoured – power cable with an additional layer of steel or aluminium material to offer additional mechanical protection. It’s mechanically very tough and can be buried directly underground or used in applications where severe mechanical stress is present. Other name you may met, DSTA stands for double of steel tape armored; CTS stands for copper tape screen; LSZH/LSOH stands for low smoke zero halogen. Keep one eye on those you are not familiar with and collect them altogether for use on rainy days.   http://www.zhenglancable.com/