WDZB-YJY MV Cable, B-Class LSZH Flame Retardant XLPE Insulated Non-Armored Power

WDZB-YJY 8.7/15kV is a high-quality Class B low-smoke halogen-free flame-retardant medium-voltage power cable designed for modern high-standard commercial, industrial, and municipal medium-voltage power distribution systems. This cable features a highly conductive, compact copper conductor, a three-layer co-extruded semi-conductive shielding structure, high-performance cross-linked polyethylene (XLPE) insulation, and a WDZB-grade low-smoke halogen-free (LSZH) outer sheath, offering upgraded Class B flame retardancy, low smoke emissions, halogen-free environmental performance, and excellent dielectric stability.

This cable is suitable for 15kV rated power grids, effectively suppressing partial discharge, limiting water tree spread, and resisting long-term thermal aging under continuous cyclic loads. Compared to ordinary flame-retardant cables, its Class B fire resistance limits flame spread to a controllable range, while the halogen-free formula avoids the generation of toxic and corrosive gases during combustion. This unarmored, lightweight construction allows for flexible protective installation and fully complies with IEC international standards, global fire safety codes, and green building codes. It is the ideal designated solution for EPC contractors, electrical consulting engineers, facilities managers, and professional purchasers who need to strike a balance between fire protection, environmental protection, operational reliability, and project cost control.

Core Technical Specifications

• Rated Voltage: 8.7/15kV (Uo/U), suitable for conventional 15kV grounded medium-voltage systems
• Conductor: Category 2 compact bare copper stranded conductor, low DC resistance, high mechanical toughness, and stable connection performance
• Insulation: Cross-linked polyethylene (XLPE), high dielectric strength, ultra-low dielectric loss, and excellent anti-aging and anti-water treeing properties
• Shielding System: Inner semi-conductive shielding layer + uniform XLPE insulation layer + outer semi-conductive shielding layer, achieving a balanced electric field distribution
• Outer Sheath: Class B flame-retardant low-smoke halogen-free (LSZH) compound, weather-resistant and moisture-proof
• Continuous Operating Temperature: Maximum 90℃
• Short Circuit Withstand Temperature: 250℃, short-time withstand voltage within 5 seconds
• Flame Retardant Rating: WDZB Class B flame-retardant performance conforming to IEC 60332-3 standard
• Minimum Bending Radius: 10 times the cable outer diameter, facilitating flexible wiring and compact installation
• Standards Compliance: IEC 60502-2, GB/T 12706.3, CE, RoHS, ISO 9001

Specifically designed for protective cabling environments with higher fire safety requirements:

• Urban power grids, indoor substation connections, and medium-voltage distribution trunk lines
• Industrial plants, manufacturing bases, chemical and light industrial areas with fire control requirements
• High-rise buildings, integrated commercial districts, hospitals, schools, and densely populated public facilities
• Rail transit auxiliary facilities, underground utility tunnels, tunnels, and semi-enclosed public spaces
• Renewable energy power plants, including solar power plants, wind power plants, and energy storage systems, for medium-voltage cabling
• Cable trenches, enclosed conduits, indoor concealed cabling, and outdoor protective conduit installation

• Advanced Class B Flame Retardant Performance: WDZB's Class B flame retardant design offers stronger flame spread suppression than standard Class C cables. It effectively limits the vertical and horizontal spread of flames, reducing the risk of large-area fire spread and enhancing the overall fire protection performance of industrial and public works power systems.
• Stable Medium-Voltage Dielectric Performance: An integrated semiconductor shielding layer and high-purity cross-linked polyethylene (XLPE) insulation minimize partial discharge and electric field distortion. It maintains stable insulation performance even under long-term high loads and temperature fluctuations, reducing medium-voltage insulation breakdown and leakage failure rates.
• Low-Smoke, Halogen-Free, Environmentally Friendly and Safe Performance: Halogen-free, non-toxic, and low-smoke formulation prevents the release of corrosive gases in fire accidents, protecting precision electrical equipment and improving emergency evacuation visibility. Complies with global environmental protection and sustainable building regulations.
• Lightweight and Cost-Effective Installation: The unarmored streamlined structure reduces the overall cable weight and external footprint, optimizes duct utilization, reduces transportation, handling, and on-site installation labor costs, and shortens the construction cycle for large medium-voltage projects.
• Long-Term Environmental Adaptability: The custom-designed Low Smoke Halogen-Free (LSZH) sheath offers excellent moisture resistance, aging resistance, and climate stability, adapting to high humidity, temperature variations, and mildly corrosive indoor and semi-outdoor working environments, thus extending its service life.

6. Key Engineering and Procurement Considerations

• Laying Condition Limitations: The unarmored structure is only suitable for protected installation environments. It is not recommended for direct burial, heavy machinery crushing, strong impact, or rodent-infested areas; for harsh working environments, please select the custom-designed armored version.
• Fire Rating Selection Guidelines: WDZB Class B flame retardant offers superior fire resistance compared to standard WDZ Class C flame retardant. Engineers should select the appropriate flame retardant rating based on local fire codes, project risk levels, and fire compartment design.
• Accessory Requirements: To maintain overall fire and environmental performance, compatible Low Smoke Halogen-Free (LSZH) terminals, cable connectors, and fire-resistant accessories should be used to avoid performance degradation at connection points.
• System Parameter Matching: The 8.7/15kV rating is compatible with standard 15kV distribution networks. Please confirm the system grounding method, load current, and ambient temperature to select an appropriate conductor cross-sectional area to obtain a stable current-carrying capacity.

• Global Compliance, Complete Documentation: All products are CE, RoHS, and ISO certified and come with complete third-party fire resistance test reports, electrical performance test data, and factory documentation, supporting international bidding, customs clearance, and final project acceptance.
• Strict Raw Material and Process Quality Control: We use high-purity oxygen-free copper, brand-grade XLPE insulation materials, and high-performance Class B low-smoke halogen-free (LSZH) compounds. Automated co-extrusion production and 100% online high-voltage withstand and partial discharge testing ensure batch quality consistency.
• B2B Customized Engineering Solutions: We support customized core counts, conductor cross-sections, special sheath formulations, and printed markings to meet regional industry standards and bidding technical requirements. Flexible minimum order quantities are available for wholesale and EPC long-term orders.
• Factory Direct Sales, Highly Competitive Prices: Direct factory supply eliminates intermediary costs, providing cost-effective products for medium-voltage infrastructure, industrial parks, and public utilities projects, and guaranteeing stable delivery times.
• Professional Global Technical Support: Our experienced electrical engineering team provides free cable current carrying capacity calculations, selection consultations, on-site installation guidance, and after-sales technical support, promptly resolving core technical challenges faced by engineers and procurement teams worldwide.