China Zhenglan Cable Technology Co., Ltd Company News

The designation codes in different country for different type of cable are different in each country. Below are parts of the Designation Codes for cable designation in Germany.   Reference standards DIN VDE 0292 Type Designation Codes for cable designation DIN VDE 0293-308 Identification of the cores of cables / wires and flexible wires by colors Standard series DIN VDE 0281 for PVC-insulated cables Standard series DIN VDE 0282 for rubber insulated cables Designation Codes for Plastic insulated Power Cables Power cables with plastic insulation and plastic sheath according to DIN VDE 0262, DIN VDE 0263, DIN VDE 0265, DIN VDE 0266, DIN VDE 0267, DIN VDE 0271, DIN VDE 0273 and DIN VDE 0276 part 603, 604, 620, 622, 626 For cables with plastic insulation and plastic sheath the following designation codes are used (starting with the conductor): Code Description N Cables acc. to standard A Aluminum conductor Y Insulation of polyvinyl chloride (PVC) 2Y Insulation of thermoplastic polyethylene (PE) X Insulation of cross-linked polyvinyl chloride (XPVC) 2X Insulation of cross-linked polyethylene (XLPE) H Field limiting conductive layers over the conductor and over the Insulation HX Insulation of cross-linked halogen-free polymer blend C Concentric conductor of copper CW Concentric conductor of copper, waveform (ceander) CE Concentric conductor in multi-core cables on each individual core S Braided copper SE For multicore cables field limiting conductive layers over the conductor and the insulation and copper screen over each individual core (indicated by “H” is omitted here) F Overhead line cable (DIN VDE 0276) F Armouring of galvanized flat steel wire FE insulation sustaining (F) Longitudinally watertight cable (screen) B Steel tape armouring R Armouring of galvanized round steel wires G Helix of galvanized steel tape HX Sheath of cross-linked halogen-free polymer blend Y Inner sheath of polyvinylchloride (PVC) Y Outer sheath of polyvinylchloride (PVC) 2Y Outer sheath of polyethylene (PE) 1Y Outer sheath of polyurethane (PUR)   Conductor cross-section, shape and structure Code Description R Circular conductor S Sector shaped conductor E Solid conductor M Stranded conductor RE Circular conductor, solid RM Circular conductor, stranded SE Sector shaped conductor, solid SM Sector shaped conductor, stranded OM Oval shaped conductor, stranded H Waveguide /V Compacted conductor  

Dear Customers,   Please be informed that our company will be closed from January 26th to February 4th for the Chinese New Year holiday. Normal business will resume on February 5th We're sorry for any inconvenience that occurred please do drop us an email at worldmarket@zhenglancable.com or call us if you have urgent matters. We would like to express our heartiest thanks for your great support and cooperation. Wishing you a prosperous year in 2025!   Zhenglan Cable Technology CO., Ltd.

  In practical applications, the design of compressed copper conductors needs to consider many factors, including compression coefficient, stranding structure, material resistivity, etc.   For example, for a 95 mm² compressed copper conductor, its kilometer resistance should not exceed 0.193Ω/km, which needs to be achieved through a reasonable stranding structure and single wire diameter.   The compression process will increase the resistivity of the conductor, so it is necessary to introduce corresponding correction factors during design, such as compression coefficient K3 and stranding coefficient K2, to ensure that the final resistance value meets the standard requirements.     The relationship between the cross-sectional area and DC resistance of compressed copper conductors can be summarized by the following points: 1. Inverse relationship: The cross-sectional area A is inversely proportional to the DC resistance R, that is, the larger the cross-sectional area, the smaller the DC resistance. 2. Compression effect: The compression process will cause the conductor to harden, thereby increasing the resistivity, which needs to be adjusted through the correction factor. 3. Design requirements: According to national standards (such as GB/T3956), the DC resistance value of the conductor is the key indicator to measure its qualification, and the cross-sectional area is only the basis for design and calculation. 4. Adjustment in practical application: In the production process, in order to reduce costs, the cross-sectional area may be reduced to the minimum value to meet the DC resistance requirements, but this practice may affect the overall performance of the cable.   Therefore, when designing and manufacturing compressed copper conductors, it is necessary to comprehensively consider factors such as cross-sectional area, compression coefficient, and material resistivity to ensure that the DC resistance of the conductor meets the standard requirements and meets the performance requirements in practical applications.   The specific calculation method of the compression coefficient K3 and twisting coefficient K2 of the compressed copper conductor is as follows: Compression coefficient K3： Compression coefficient K3 refers to the ratio of the actual cross-sectional area of ​​the conductor after compression to the theoretical cross-sectional area when not compressed. According to the evidence, the value of the compression coefficient is usually 0.90, which is empirical data based on production experience and process tests.   Twisting coefficient K2 ： The twisting coefficient K2 refers to the ratio of the actual length of a single wire to the length of the twisted wire pitch within a twist pitch. Other related parameters 1. Single wire diameter: For stranded conductors with a single wire diameter greater than 0.6 mm, K2 is 1.02; for stranded conductors with a single wire diameter not greater than 0.6 mm, K2 is 1.04. 2. Cabling coefficient: For single-core and non-cabled multi-core cables, it is 1, and for cabled multi-core cables, it is 1.02.   In summary, the specific calculation method of the compaction coefficient K3 and twisting coefficient K2 of compacted copper conductors is as follows: Compressive coefficient K3: Usually the value is 0.90.

Dear Customer,   Thanks for your support in the past year. We cannot make even a little progress in our business without your attention. That's why we never forget the past.    Here comes the new year. We send our blessings to you. May your year be filled with love, laughter, and endless possibilities. May your journey through 2025 be filled with adventure, joy, and wonder.   Happy New Year!!   Zhenglan Cable Technology Co., Ltd.

Dear Customer   Thank you for visiting our website.   Upon the Christmas May your Christmas be filled with love, laughter, and the warmth of family and friends. May your holiday be as wonderful as you are, filled with love, joy, and festive cheer.   Merry Christmas!   Zhenglan Cable Technology Co., Ltd

Flame-retardant wire refers to wires that are fireproof and flame-retardant. Generally, under test conditions, after the wire is burned, if the power is cut off, the fire will be controlled within a certain range and will not spread. It has the performance of flame retardancy and suppression of toxic smoke. As an important part of electrical safety, the selection of materials for flame-retardant wires is crucial. At present, the commonly used flame-retardant wire materials on the market include PVC, XLPE, silicone rubber, and mineral insulation materials. Material selection of flame-retardant wires and cables The higher the oxygen index of the material used for flame-retardant cables, the better the flame-retardant performance, but as the oxygen index increases, some other properties will be lost. If the physical properties and process properties of the material are reduced, the operation is difficult, and the material cost is increased, so the oxygen index should be reasonably and appropriately selected. Generally, if the oxygen index of the insulating material reaches 30, the product can pass the test requirements of Class C in the standard. If the sheath material and the filling material are both flame-retardant materials, the product can meet the requirements of Class B and Class A. Materials for flame-retardant wires and cables are mainly divided into halogen-containing flame-retardant materials and halogen-free flame-retardant materials;   1. Halogen-containing flame-retardant materials decompose and release hydrogen halides when heated during combustion. Hydrogen halides can capture active free radicals HO roots, thereby delaying or extinguishing the combustion of the material and achieving the purpose of flame retardancy. Commonly used materials include polyvinyl chloride, chloroprene rubber, chlorosulfonated polyethylene, ethylene propylene rubber, etc. 1) Flame-retardant polyvinyl chloride (PVC): Due to its low price, good insulation, and flame retardancy, polyvinyl chloride is widely used in ordinary flame-retardant wires and cables. To improve the flame retardancy of PVC, halogen flame retardants (decabromodiphenyl ether), chlorinated paraffin, and synergistic flame retardants are often added to the formula to improve the flame retardancy of polyvinyl chloride; Ethylene propylene rubber (EPDM): It is a non-polar hydrocarbon with excellent electrical properties, high insulation resistance and low dielectric loss, but EPDM is a flammable material. It is necessary to reduce the degree of cross-linking of EPDM and reduce the low molecular weight substances produced by molecular chain disconnection to improve the flame retardancy of the material; 2) Low smoke and low halogen flame retardant materials are mainly for polyvinyl chloride and chlorosulfonated polyethylene. Add CaCO3 and A(lOH)3 to the formula of polyvinyl chloride. Zinc borate and MoO3 can reduce the HCL release and smoke of flame-retardant polyvinyl chloride, thereby improving the flame retardancy of the material and reducing the emission of halogen, acid mist and smoke, but may slightly reduce the oxygen index.   2. Halogen-free flame retardant materials Polyolefin is a halogen-free material composed of hydrocarbons. It decomposes carbon dioxide and water when burned, and does not produce obvious smoke and harmful gases. Polyolefins mainly include polyethylene (PE) and ethylene-vinyl acetate (E-VA). These materials themselves are not flame retardants, and inorganic flame retardants and phosphorus series flame retardants need to be added to be processed into practical halogen-free flame retardant materials; however, due to the lack of polar groups on the molecular chain of non-polar substances, they are hydrophobic and have poor affinity with inorganic flame retardants, making it difficult to combine firmly. To improve the surface activity of polyolefins, surfactants can be added to the formula; or polymers containing polar groups can be mixed into polyolefins for blending, thereby increasing the amount of flame retardant fillers, improving the mechanical properties and processing properties of the material, and obtaining better flame retardancy. It can be seen that flame-retardant wires and cables are still very advantageous and are very environmentally friendly to use.