Power Cable for Subway and Urban Rail Transit (Rated Voltage 35kV)

Technical Standards
The production and testing of these products strictly follow national and enterprise standards to ensure high compliance under rail transit operating conditions:
*   Technical Specification: Manufactured in accordance with the enterprise standard GB/T 12706.3-2020. 

Product Structure and Model Features
Based on the diverse laying environments of rail transit, the product offers multiple functional combinations:
*   Model Examples: Includes (FZ-FSY)-WD-TYJY (Low-smoke halogen-free flame-retardant, anti-termite and anti-rodent, XLPE insulated, polyolefin sheathed power cable) and (FZ-FSY)-DD-TYJV, among others.
*   Multi-Dimensional Protection: The structural design balances electrical stability with physical toughness. The outer sheath material possesses excellent resistance to environmental stress cracking, effectively blocking the destruction chain of termites and rodents.
*   Production Range: Conductor cross-sections cover various specifications up to 630mm², satisfying the power supply needs of different load levels. 

Operating Characteristics & Performance Advantages
*   Rated Voltage Level: The rated voltage ($U_0/U$) of the products is 21/35kV and 26/35kV.
*   Thermal and Discharge Performance:
*   The maximum long-term allowable operating temperature of the conductor is 90°C, and the instantaneous maximum temperature during a short circuit (max. duration 5s) can reach 250°C.
*   Cables must pass 3.5 $U_0$ AC and DC voltage resistance tests to ensure the long-term reliability of the insulation structure.
*   Strict Fire and Environmental Indicators:
*   Low Smoke: The light transmittance of the halogen-free cable during combustion is not less than 60%.
*   Halogen-Free: The total content of halogen acid gas produced during combustion does not exceed 5mg/g. The PH value of the evolved gas is not less than 4.3, and the conductivity is not more than 10μS/mm, ensuring safety during fire evacuation.
*   Flexible Installation Requirements:
*   The ambient temperature for installation should be no lower than 0°C (preheating is required if below this temperature).
*   Scientific Bending Radius: For single-core cables, it is not less than 20D (unarmored) and 15D (armored); for multi-core cables, it is not less than 15D (unarmored) and 12D (armored), where D is the outer diameter of the cable. 

Core Application Scenarios
This series of cables is widely utilized in the core power systems of various rail transit projects:*   Rail Transit Main Lines: Suitable for 35kV power supply networks of subways, light rails, and urban commuter railways.
*   Underground Sections and Tunnels: With its excellent LSZH properties and biological resistance, this cable is the preferred solution for wiring in tunnels, underground platforms, and areas with restricted ventilation.
*   Complex Environmental Conditions: Provides a long-lasting physical and chemical protective barrier in areas along the track with a high risk of termite infestation or rodent damage.

Q: In which fields are your company's products applied?

A: The products cover multiple fields including electric power, new energy, transportation, communications, and engineering. Custom Power Cable for Subway and Urban Rail Transit (Rated Voltage 35kV). The company has also continuously passed the qualification verification for power cables and conductors of the State Grid Corporation of China for many years.

Q: What is your company's production capacity?

A: Guanghuan Cable currently has a standardized production base and has built a full-chain industrial system covering R&D, production, and testing. Power Cable for Subway and Urban Rail Transit (Rated Voltage 35kV) Manufacturer in China. It occupies an area of over 100,000 square meters with a building area of more than 45,000 square meters. The company owns over 70 advanced production and testing equipment lines, employs more than 140 staff, and achieves an annual output value exceeding 3 billion RMB.

Q: Has the company obtained relevant quality system certifications?

A: Yes. The company has obtained ISO9001 Quality Management System, ISO14001 Environmental Management System, ISO45001 Occupational Health and Safety Management System, and GB/T23331 Energy Management System certifications. It has also obtained the national compulsory CCC certification and the National Industrial Production License.

Q: What green and environmental certifications or initiatives does the company have?

A: The company has established an Environmental Management System, Energy Management System, Green Management System, and Social Responsibility Management System. As Power Cable for Subway and Urban Rail Transit (Rated Voltage 35kV) Factory in China, it has completed product carbon footprint certification and obtained certifications such as "Green Manufacturing Enterprise," "China Energy-Saving and Environmental Protection Product," and "Carbon Neutrality Commitment Demonstration Unit."

Q: Does the company focus on technological innovation? What recent patent achievements have there been?

A: The company actively implements the strategy of "revitalizing the enterprise through science and technology" and continuously increases R&D investment. As of 2026, it has disclosed 45 patents, including an important patent for "a halogen-free flame-retardant environmentally friendly cable and its preparation method."

Q: Does the company have sales and service networks across the country?

A: Yes. The company has set up sales outlets or offices in many major cities across China, such as Nanjing, Shanghai, Beijing, Guangzhou, Shenzhen, and Inner Mongolia, responsible for marketing and product after-sales service.