China Zhenglan Cable Technology Co., Ltd Company News

The Difference Between Oxygen-Free Copper, Low-Oxygen Copper, and Electrolytic Copper: 1. Purity: Oxygen-free copper: Extremely pure, typically with an oxygen content below 20 ppm, minimal impurities, and a copper content exceeding 99.99%. Low-Oxygen Copper: Oxygen content is generally around 200-400 ppm, slightly lower in purity than oxygen-free copper. Electrolytic Copper: Higher in purity, reaching 99.95%-99.98%, but still contains a certain amount of oxygen and other impurities such as lead, bismuth, and antimony. 2. Production Process: Oxygen-free copper: Typically produced using the top-draw or continuous casting and rolling methods, strictly controlling oxygen content during production and utilizing specialized smelting equipment and processes to ensure copper purity and performance. Low-Oxygen Copper: Typically produced using the continuous casting and rolling process, with relatively loose control over oxygen content during production. Targeted performance requirements are achieved through controlled oxygen content during the smelting process and the use of additives. Electrolytic copper: Produced through electrolytic refining, using crude copper as the anode and pure copper as the cathode, electrolysis occurs in a copper sulfate electrolyte. Impurities in the crude copper are removed during the electrolysis process, resulting in high-purity electrolytic copper.

Dear Customer Thanks for visiting our website. Here comes China's National Day and Mid Autumn Festival holiday. We will be on a 8-day holiday from October 1st(Wednesday) to October 8th(Wednesday). During holiday, we may have limit access to email. Shall any delay to reply your email, kindly ask for your understanding. Zhenglan Cable Technology Co., Ltd 2025. 09.30

We are going to attend the FIEE exhibision (International Trade Show of the Electrical, Electronic, Power, Automation and Connectivity Industry) to be held on September 9th~12th at São Paulo Expo Exhibition & Convention Center, and our booth number is H4. A39.   If you are going there, welcome your coming to our booth. Look forward to meeting you.   Zhenglan Cable Technology Co., Ltd  

The International Electrotechnical Commission (IEC), the world's most authoritative electrical standards organization, specifies that safety grounding conductors must use alternating green and yellow conductors. This special color scheme requires alternating stripes of the two colors every 25 mm, creating a unique visual identifier. The choice of the yellow-green combination was based on rigorous human factors research. The two colors provide a sharp contrast in most lighting conditions, making them easily identifiable even for those with color blindness and difficult to confuse with other functional conductors.   In electrical equipment, the grounding conductor fulfills the crucial function of conducting fault current to the earth. When insulation failure causes the equipment casing to become live, a good grounding system can trigger protective devices to disconnect power within milliseconds, preventing electric shock accidents. Standardized colors enable operators to instantly identify grounding conductors, significantly reducing the risk of misoperation during emergency repairs or routine maintenance. Studies have shown that standardized color coding can increase electrical maintenance efficiency by 40% and reduce accident rates by over 60%.   While the IEC standard has been adopted by most countries, the United States maintains its unique grounding conductor specifications. According to the US National Electrical Code (NEC), grounding wires can be either bare copper wire or solid green insulated conductors. This difference stems from the history of electrical engineering. Early US electrical systems used green as a grounding color, a color that remains in place today to maintain system continuity. In contrast, the UK and EU countries strictly enforce the yellow-green stripe standard, with regulations such as BS 7671 clearly stipulating legal liability for non-compliance.   Special circumstances often require workarounds. High-voltage substations may use orange grounding wires, while offshore platforms may use blue. These exceptions require special approval from regulators, prominent warning signs on the equipment, and specialized training for personnel.

  Cable shielding density is a quantitative indicator of the shielding ability of a cable shield against electromagnetic signals. It is usually expressed as a percentage, reflecting the degree to which the shield can block or attenuate electromagnetic interference. For example, in the case of a braided shield, the shielding density depends on factors such as the thickness of the braided wires and the tightness of the weave. A higher braid density means smaller gaps between the braided wires, and thus a stronger ability to block electromagnetic interference. For example, a shielding density of 90% means that the cable shield can theoretically block 90% of external electromagnetic interference signals, allowing only 10% of interference signals to pass through the shield and affect signal transmission within the cable.   Common cable shielding densities vary. The following are some of the more common ones: • 70%: Provides a certain degree of protection against external electromagnetic interference and is suitable for general electrical equipment connections with relatively low electromagnetic shielding requirements. • 80%: Provides good electromagnetic interference suppression and is commonly used for internal wiring of general electronic equipment and office equipment. • 90%: Provides excellent shielding effectiveness and is suitable for applications with certain electromagnetic environment requirements, such as industrial automation control systems. • 95%: Offers high shielding performance and is commonly used in cables sensitive to electromagnetic interference, such as communications and data transmission. • 98%: High shielding density, suitable for specialized applications with stringent electromagnetic shielding requirements, such as medical equipment and aerospace. • 99% and above: Provides extremely excellent shielding effectiveness and is generally used in military, high-end scientific research, and other applications with extremely high electromagnetic compatibility requirements.   The selection of cable shield braid density requires comprehensive consideration of multiple factors, including the application scenario, equipment requirements, and cost.   Chinese standards have different requirements for cable shielding density: • For single-core shielded cables with a nominal cross-section of 0.12 mm² or less, the shield braid density should be no less than 60%. • For other shielded cables, the shielding density should be no less than 80%. • For computer cables: The individual shielding density must reach 85%, and the total shielding density must reach 95%. • For control cables: When using round copper wire braided shielding, the braid density should be no less than 80%.

The main reasons for using fumigated wooden trays for cable export are: 1. Compliance with international quarantine requirements. • Regulatory Compliance: Most countries/regions around the world have strict quarantine regulations to prevent wooden packaging from carrying harmful organisms (pests, insect eggs, pathogens, etc.) that could cause biological invasions or spread plant pests and diseases. • Core Measures: Fumigation kills harmful organisms in the trays, ensuring that the goods pass quarantine inspection in the importing country and avoiding the risk of return or destruction. 2. Protecting Cable Products. • Structural Advantages: The trays are sturdy, providing stable support for the cables and resisting mechanical damage such as collisions and crushing during transportation and loading and unloading. • Environmental Adaptability: Wood's natural moisture-proof and cushioning properties reduce the effects of humidity, vibration, and other environmental factors on the cable insulation and outer sheath. 3. Ease of Transportation and Loading and Unloading. • Standardized Design: Fumigated wooden trays have uniform specifications (such as diameter and load-bearing capacity) to accommodate cable winding and securing, improving storage and stacking efficiency. • Mechanized Operation: The standardized design facilitates forklift and crane operation, reducing manual handling losses and optimizing logistics space utilization. IV. Environmental Sustainability • Material Characteristics: Wood is a renewable resource and can be recycled after use, aligning with the global trend towards green packaging. • Comparative Advantages: Lower carbon footprint compared to single-use plastic/metal packaging, reducing waste disposal costs. How to Determine the Compliance of Fumigated Wooden Trays 1. Check the IPPC Mark ✅ Core Marking Elements: • IPPC (International Plant Protection Convention) logo • Country code (e.g., CN for China) • Treatment agency code (e.g., HT for a fumigation agency) • Treatment method code (e.g., MB for methyl bromide fumigation) • The mark is typically printed or branded in a conspicuous location on the wooden tray (e.g., edge or side). II. Verify the Fumigation Certificate ✅ Key Certificate Information: ・ Treatment date, location, number of pallets, and specifications; ・ Fumigant type (e.g., methyl bromide), concentration, and treatment duration; ・ Implementation standards (e.g., ISPM 15 International Wood Packaging Standard); ・ Issuing agency seal and validity period, which must be issued by an officially recognized quarantine agency. III. Preliminary Appearance Inspection (Supplementary Reference) ⚠️ Non-absolute basis for judgment: ・ The wood may appear slightly yellow (a sign of chemical penetration); ・ Occasional light brown chemical stains or slight cracks may be seen on the surface (a natural phenomenon during the drying process); • Appearance alone is not acceptable for judgment; the inspection must be based on both the label and the certificate. IV. Professional Testing and Verification ✅ Scientific Testing Methods: 1. Chemical Analysis: Check the wooden pallets for residual fumigants (such as methyl bromide). Residual levels must be below international safety standards. 2. Biological Testing: Microscopic observation or culture methods confirm the absence of live insects, eggs, and microbial residues. 3. Application Scenarios: For high-risk cargo or trade disputes, commission a third-party testing agency to issue a report. Key Points Summary Necessity of Use: Quarantine compliance is mandatory, and wooden pallets offer advantages in terms of protection, logistics, and environmental protection. Compliance Assessment: Prioritize verification of the IPPC mark and official certificate. Appearance is a secondary reference, and professional testing is the final decision.