XLPE Cable Non-halogen Fire-survival Steel Wire Armoured MV Cable for Substation & Closed High-standard Industrial Infrastructure

WDZBN-YJY73 26/35kV is a medium-voltage armored power cable with comprehensive characteristics including Class B flame retardancy, low smoke halogen-free, and fire resistance. It is specifically designed for 26/35kV rated voltage power transmission and distribution systems. The cable uses cross-linked polyethylene insulation, with a low smoke halogen-free outer sheath and a thickened round steel wire armor layer, resulting in an optimized structure. The YJY73 model features a steel wire armor structure, suitable for direct underground laying, tunnel laying, and fixed laying in harsh environments. The WDZBN code defines its core environmental and fire safety attributes: WDZ represents low smoke halogen-free Class B flame retardancy, and BN represents fire-resistant structural design, meeting the power safety requirements of high-standard fire protection projects and gaining popularity among power design institutes, EPC contractors, and bulk purchasers in emerging markets worldwide. Unlike traditional YJV73 medium-voltage cables, this series of cables features an upgraded raw material formula, using completely halogen-free compounds, achieving ultra-low smoke density during open flame combustion and emitting no toxic or corrosive gases.

Rated Voltage Rating:

26/35kV U0/U

Standard Operating Frequency:

50Hz

Conductor Long-Term Permissible Operating Temperature:

90℃ (XLPE Insulation Core Material Standard)

Short Circuit Withstand Temperature (Maximum 5 seconds):

250℃

Power Frequency Withstand Voltage Test:

78kV/15min (Factory Routine Inspection Standard)

Impulse Withstand Voltage:

Each batch passes a 200kV lightning impulse test

Conductor Type:

Solid/Stranded Annealed Copper Conductor, Class 2 Compacted Stranded Copper Conductor conforming to IEC 60228 standard

Cross-Section Size Range:

3×50mm² ~ 3×630mm² Full range of in-stock specifications; custom/non-standard cross-section specifications can be customized according to buyer's engineering drawings.

Conductor DC Resistance:

Strictly controlled below the upper limit specified by IEC at an ambient temperature of 20℃.

Insulation Layer:

High-purity cross-linked polyethylene (XLPE) insulation, uniform wall thickness, no air gaps within the insulation layer, thickness conforming to the 35kV medium-voltage insulation design specification.

Inner Liner:

Low-smoke halogen-free extruded buffer layer, buffering insulation and preventing armor friction damage.

Armor Layer:

Hot-dip galvanized round steel wire armor (YJY73 structural feature), armor wire diameter customized according to burial depth and external mechanical load requirements, resistant to compression and rodent bites.

Outer Sheath:

Low-smoke halogen-free thermosetting LSZH outer sheath, ozone-resistant and aging-resistant.

Ambient Laying Temperature:

≥0℃ (fixed laying installation)

Minimum Bending Radius:

≥15 times the outer diameter of the finished cable during installation.

Operating Altitude Adaptability:

Altitude ≤3000m, no parameter degradation; high-altitude customized versions are available for high-altitude projects.

• Superior Low-Smoke, Halogen-Free, and Environmentally Friendly Performance: The entire cable insulation and sheath are made of halogen-free polymer raw materials. During open flame combustion, the smoke penetration rate exceeds 70%, and it does not release toxic gases such as hydrogen halogen acids. This significantly improves visibility for personnel evacuation in fire accidents, a core indicator for priority fire protection projects.
• Dual Performance of Class B Flame Retardant + Class N Fire Resistance: Passes the GB/T 19666 Class B flame retardant vertical burning test and fire resistance integrity test, enabling short-term power supply under specific fire conditions, ensuring emergency power supply for fire-fighting equipment and critical load equipment.
• Superior Mechanical Protection with Steel Wire Armored Structure: The YJY73 uses circular steel wire armor, effectively resisting damage from sharp underground rocks, heavy vehicle crushing, and rodent infestation. It can be directly buried underground without additional steel pipe protection, reducing on-site construction auxiliary material costs.
• Cross-linked polyethylene (XLPE) insulation materials have excellent electrical stability: XLPE insulation materials have ultra-low dielectric loss, stable insulation resistance, and small capacitance changes under long-term alternating loads, which can reduce power loss in medium-voltage lines and improve the overall grid operation efficiency of long-distance transmission lines.
• Extreme weather resistance: The LSZH outer sheath incorporates UV-resistant and hydrolysis-resistant additives, making it suitable for long-term outdoor environments such as coastal high-salt spray, industrial chemical corrosion, and high-altitude low temperatures. Under normal operating conditions, its design service life can reach 30 years.

• Full-layer halogen-free upgrade: Common YJV73 35kV cables on the market use halogen-containing PVC outer sheaths, while our WDZBN-YJY73 cable uses LSZH formula for all non-conductive layers, fully complying with international green building electrical standards.
• Dual fire safety certification integrated: Integrating flame-retardant and fire-resistant functions into a single cable eliminates the need for separate fire-resistant backup cables in engineering designs, optimizing pipeline layout space.
• Flexible specification customization: Supports short-time bulk orders, non-standard core segment customization, and mixed-package consolidation, reducing the buyer's inventory backlog risk.
• Batch consistency control: Utilizing an automated continuous extrusion production line, each roll of cable undergoes online real-time insulation thickness and partial discharge testing, resulting in a zero partial discharge rate in the finished product's factory test.

• Municipal Power Grid Renovation Projects: 35kV ring network in urban centers, transmission lines for urban underground integrated pipe corridors, and power grid upgrades in old urban areas. These core scenarios have strict requirements for fire prevention and low-smoke operation.
• Large-Scale Comprehensive Public Construction Projects: Transmission lines for airport terminals, high-speed rail hubs, large commercial complexes, underground shopping malls, hospitals, and large comprehensive sports stadiums. All projects have mandatory fire safety acceptance standards.
• Industrial Park and Heavy Machinery Plant Projects: Fixed medium-voltage transmission lines in chemical industrial parks, new energy battery plants, and metallurgical processing parks. Suitable for corrosive plant environments and direct-buried on-site layouts.
• New Energy Power Generation Matching Projects: Outgoing lines from wind farm substations, 35kV transmission lines for centralized photovoltaic power stations, and internal main distribution cables for energy storage power stations. Meets the stringent safety access standards of the new energy industry.
• Transportation infrastructure: auxiliary power systems for urban subways, 35kV power supply for highway service areas, fixed power distribution lines in tunnels, and preferred cable models for laying cables in enclosed spaces.

• Direct Burial Installation Recommendations: When the burial depth exceeds 1.2 meters or heavy machinery operations are frequent in the construction area, it is recommended to use the WDZBN-YJY73 thickened steel wire armored custom version to reduce the frequency of later maintenance and replacement.
• Pipe Gallery/Tunnel Installation Recommendations: For installations in confined spaces, WDZBN low-smoke halogen-free cables should be prioritized over ordinary PVC-sheathed cables to meet the fire safety inspection standards for pipe gallery projects.
• Coastal Salt Spray Area Project Recommendations: For projects in coastal ports and offshore industrial parks, an anti-salt spray enhancement formula can be added to the outer sheath to mitigate electrochemical corrosion of the sheath in high-salt environments.
• High-Altitude Area Project Recommendations: For construction sites at altitudes above 3000 meters, we will adjust the insulation material formula to a custom specification resistant to low air pressure to avoid partial discharge of the insulation material caused by the thin air at high altitudes.
• Class I Fire-Resistant Building Reminder: Class I fire-resistant public buildings must adopt a BN fire-resistant structural scheme for the 35kV main line to successfully pass the pre-acceptance inspection by the local fire department.

• Raw Material Source Verification: Confirm that all low-smoke halogen-free insulation and sheathing raw materials comply with international halogen-free testing standards. Require suppliers to provide factory testing reports for raw materials before signing bulk orders to avoid the introduction of inferior recycled materials into the cables, which could lead to project acceptance failure.
• Bulk Sampling Testing Arrangement: Negotiate third-party authorized laboratory sampling inspection clauses in the sales contract. Arrange for random sampling of cable coils for fire resistance, flame retardancy, and electrical parameter testing before full container shipment.
• Specification Matching with Engineering Drawings: Submit the project's electrical schematics and installation environment description to my technical team in advance. My engineers will provide optimal cross-section and armor thickness matching suggestions to avoid on-site rework costs due to incorrect procurement models.
• Delivery Cycle and Inventory Planning: Standard mainstream specifications (3×95/150/240mm²) are readily available from the factory, enabling 7-day rapid delivery. Non-standard customized specifications will have their production cycle confirmed during pre-order communication to coordinate with project construction schedules.
• Packaging and Logistics Optimization: Large cross-section medium-voltage cables are packaged in steel-wood reels for export and undergo moisture-proof treatment. We offer optimized container loading layout solutions to maximize container space utilization and reduce unit ocean freight costs for bulk importers.

• Domestic Standard Compliance: Complies with GB/T 12706 National Standard for Medium-Voltage Power Cables, GB/T 19666 Specification for Flame-Retardant and Fire-Resistant Cables, and GB/T 2952 Manufacturing Standard for Armored Cables.
• International Standards Compliance: Manufactured in accordance with the core provisions of IEC 60840, IEC 60332, and IEC 61034 international standards, and conforms to local electrical engineering access specifications in most parts of Southeast Asia, the Middle East, and Africa.
• Authoritative Certifications: Complete CCC mandatory certification, national fire protection product type approval certificate, third-party CNAS laboratory test report, factory ISO9001 quality management system certification, and ISO14001 environmental management system certification. All documents are provided in English and can be used for preparing overseas tender documents.
• Customs Clearance Support: We assist buyers in issuing certificates of origin, commercial invoices, packing lists, and certification documents that meet the import customs requirements of the target country, expediting the import customs clearance process.

• Professional After-Sales Technical Support: Equipped with a team of senior electrical engineers specializing in medium-voltage cables, we provide free pre-sales selection consultation, on-site laying technical guidance document preparation, and remote online engineering parameter matching services for buyer design institutes.
• Strict End-to-End Quality Control System: From raw material inspection upon arrival and real-time online production monitoring to sampling tests for partial discharge and fire resistance performance of finished products, each roll of product has a unique batch number for easy after-sales quality traceability.
• Flexible B2B Business Cooperation Model: Supporting various international trade terms such as FOB/CIF/CFR, we offer a dual cooperation option of small-batch trial orders and large-batch long-term framework contracts; long-term contract customers can enjoy exclusive tiered bulk purchase discount policies.
• Stable Delivery Time and Global Logistics Coordination: We maintain a stock of core standard specifications and have fixed production plans for customized orders; we cooperate with multiple top global freight forwarders to provide cost-effective sea/air freight solutions, avoiding unexpected delays caused by logistical congestion.
• Long-term technical support after delivery: Provide follow-up technical consultation on on-site construction issues after the goods arrive at the port of destination; reserve spare raw materials and production capacity to meet the buyer's urgent replenishment orders for subsequent projects.