China Zhenglan Cable Technology Co., Ltd Company News

Part 1: The role and use of shielding cable Shielding cable is a transmission line that uses a metal mesh braided layer to wrap the signal line. The braided layer is generally red copper or tinned copper. Shielding cable is a kind of wire with a metal braided shell specially used to reduce the influence of external electromagnetic fields on power or communication lines. This shielding cable also has the function of preventing the line from radiating electromagnetic energy outward. The shielding layer needs to be grounded, and external interference signals can be introduced into the earth by this layer. The shielding layer of the shielded cable is mainly made of non-magnetic materials such as copper and aluminum, and the thickness is very thin, which is much smaller than the skin depth of the metal material at the frequency of use (the so-called skin effect refers to the distribution of current in the conductor cross section tending to the surface of the conductor as the frequency increases. The higher the frequency, the smaller the skin depth; that is, the higher the frequency, the weaker the penetration ability of electromagnetic waves. The effect of the shielding layer is not mainly due to the reflection and absorption of the electric field and magnetic field by the metal body itself, but due to the grounding of the shielding layer. Different grounding forms will directly affect the shielding effect.   Part 2:  Structure The wrapped conductor is called a shielding layer, which is generally a conductive cloth, a braided copper mesh, or copper (aluminum) platinum. Ordinary: insulation layer + shielding layer + conductor; advanced: insulation layer + shielding layer + signal conductor + shielding layer grounding conductor The shielding layer generally needs to be grounded. The function of the shielding wire is to isolate the electromagnetic field noise source from the sensitive equipment and cut off the propagation path of the noise source. Shielding is divided into active shielding and passive shielding. The purpose of active shielding is to prevent the noise source from radiating outward, which is a shielding of the noise source; the purpose of passive shielding is to prevent sensitive equipment from being interfered with by the noise source, which is a shielding of sensitive equipment. The shielding layer of the shielded wire is not allowed to be grounded at multiple points, because different grounding points are always different, and there is a potential difference at each point. If multiple points are grounded, current will be formed in the shielding layer, which will not only fail to play a shielding role, but will also introduce interference. Especially in occasions where frequency converters are used frequently, the interference contains various high-order harmonic components, which will cause greater impact and should be paid special attention to.

The main reasons for the large price difference of wires and cables of the same model and specification include the following aspects: ‌1. Raw material cost difference ‌: National standard cables usually use oxygen-free copper as raw material, while non-standard cables may use scrap copper. Although scrap copper and oxygen-free copper have the same weight, the price difference is 10%. Since copper accounts for most of the cost of cable raw materials, this raw material difference is particularly evident in price ‌ 2. Auxiliary material quality difference ‌: Non-standard cables may cheat on auxiliary materials and use materials of slightly lower quality. Although the cost of auxiliary materials only accounts for about 20% of the cost of cables, if poor quality auxiliary materials are used, a 5% price difference can be generated with national standard cables .   3. Wire length problem ‌: Non-standard cables may have a short meter phenomenon, that is, the actual length is less than the nominal length. For example, a 100-meter line may only have 99 meters. Although the number of meters reduced each time is not much, the cumulative cost can be significantly reduced ‌ 4. Structural differences‌: Some non-standard cables make a fuss about the structure, using national standard materials at both ends and non-standard materials in the middle. Although this practice reduces costs, it may affect the quality and performance of the cable. Since samples are usually not cut from the middle during testing, this practice has a certain degree of concealment‌   ‌How to identify high-quality wires and cables‌: ‌Check the composition of copper‌: High-quality wires and cables should use oxygen-free copper, not scrap copper. The quality can be judged by observing the color and luster of copper. ‌Check the quality of auxiliary materials‌: High-quality wires and cables should use auxiliary materials that meet the standards and avoid using inferior materials. ‌Measure the length of the wire‌: Make sure that the actual length of the wire meets the nominal length to avoid short meters. ‌Check the structure‌: Pay attention to whether there is any trick in the structure of the wire to ensure that the overall quality meets the national standard requirements.

Dear customer Here comes the Chinese traditional Dragon Boat Festival. We will start a 3-day Dragon Boat Festival holiday from May 31st till June 2nd. Work will resume from June 3rd. During this time, if we cannot reply you timely, we beg your kind understanding. Hope everyone safe and happy. Zhenglan Cable Technology Co., Ltd

The main reason for using fumigated wooden drums for cable exports 1. Comply with international quarantine requirements • Regulatory compliance: Most countries/regions in the world have formulated strict quarantine regulations to prevent wooden packaging from carrying harmful organisms (pests, eggs, pathogens, etc.) to cause biological invasion or spread of plant pests and diseases. • Core measures: Fumigation treatment can kill harmful organisms in wooden drums, ensure that the goods pass the quarantine of the importing country, and avoid the risk of return or destruction. 2. Protect cable products • Structural advantages: The wooden drum is made of strong material, providing stable support for the cable, and resisting mechanical damage such as collision and extrusion during transportation and loading and unloading. • Environmental adaptability: The natural moisture-proof and buffering properties of wood reduce the impact of humidity, vibration, and other external environments on the cable insulation layer and outer sheath. 3. Easy to transport and load, and unload • Standardized design: The specifications of the fumigated wooden drums are unified (such as diameter and load-bearing parameters), which are suitable for cable winding and fixing, and improve the efficiency of storage and stacking. •Mechanized operation: The regular shape facilitates forklift and crane operation, reduces manual handling losses, and optimizes logistics space utilization. IV. Environmental sustainability •Material characteristics: Wood is a renewable resource and can be recycled after use, which is in line with the global green packaging trend. •Comparative advantages: It is lower carbon than disposable plastic/metal packaging and reduces waste disposal costs.

Dear customers and partners, In celebration of International Workers' Day, our company will observe a holiday from May 1st to May 5th, 2025, a total of five days. Our office will resume normal operations on May 6th. During this period, our customer service will be unavailable. We will process them as soon as we return to work. For any urgent matters, please contact us at worldmarket@zhenglancable.com. We apologize for any inconvenience caused by the holiday and wish you a wonderful May Day!   Best Regards.                                                                                                                                                                             Zhenglan Cable Technology CO., Ltd

The main differences between pure copper grounding wire and copper-clad steel grounding wire are material composition, conductivity, corrosion resistance and applicable scenarios. ‌ 1. Material composition ‌Pure copper grounding wire‌: Made of pure copper, with a copper content of up to 99.95%, it has good conductivity and corrosion resistance‌ ‌Copper-clad steel grounding wire‌: It is composed of a high-strength steel core and a copper layer, and the thickness of the copper layer is generally above 0.25mm‌   2.Conductive performance ‌Pure copper grounding wire‌: Excellent conductivity, low resistivity, able to quickly conduct current and maintain a low grounding resistance value‌ ‌Copper-clad steel grounding wire‌: High resistivity, relatively poor conductivity, but in some cases, its corrosion resistance is relatively good Strong ‌   3. Corrosion resistance ‌ Pure copper grounding wire‌: Due to the high copper content, it has strong corrosion resistance, but requires better protection under complex grounding conditions ‌ Copper clad steel grounding wire‌: Weak corrosion resistance, prone to inner layer corrosion ‌   4. Applicable scenarios ‌ Pure copper grounding wire‌: Suitable for occasions with high safety requirements, such as large facilities such as power stations, to ensure the safety of the facilities ‌ Copper clad steel grounding wire‌: Suitable for small facilities, such as household electricity, small factories, etc., because of its low cost and guaranteed use effect ‌