WDZA-YJY Class A Low Smoke Zero Halogen XLPE Insulated LSZH Sheathed Power Cable for High-Rise, Metro & Public Fire-Critical Engineering

• WDZ: Low Smoke Zero Halogen (LSZH); utilizes halogen-free insulation and sheathing materials that produce minimal smoke and release no toxic halogen gases when exposed to fire.
• A: Class A smoke suppression rating; meets the highest standards for smoke density and toxicity indices as specified in fire safety codes for civil buildings.
• YJ: Cross-linked polyethylene (XLPE) insulated core; offers high-temperature resistance and low dielectric loss.
• Y: Low-smoke, zero-halogen polyolefin outer sheath; utilizes a PVC-free, LSZH composite material that does not emit chlorine gas during combustion.

The WDZA-YJY cable is a premium Class A low-smoke, zero-halogen power cable, specifically engineered for environments where personnel evacuation safety is paramount—such as densely populated public buildings, underground transit facilities, and critical fire evacuation circuits. By completely eliminating halogen-containing plastic raw materials, the cable fundamentally prevents the release of toxic acidic gases during a fire and ensures high visibility to facilitate emergency evacuation.

• Class 2 Compacted Stranded Oxygen-Free Copper Conductor: Circular stranded structure with very low DC resistance, ensuring stable long-distance power transmission performance.
• XLPE (Cross-linked Polyethylene) Insulation: Produced via irradiation cross-linking; offers excellent heat-aging resistance and maintains stable insulation performance under sustained high loads.
• Low-Smoke, Zero-Halogen (LSZH), Non-Hygroscopic Filler: Eco-friendly polyolefin-based filler; halogen-free; maintains the cable's circular profile and minimizes heat accumulation during dense installation.
• Fire-Resistant Separator Tape (Optional Upgrade): Double-layer mica tape; suitable for projects requiring circuit integrity maintenance under fire conditions.
• WDZ-A Grade LSZH Outer Sheath: Low-smoke, low-toxicity, highly flame-retardant polyolefin composite material; emits no corrosive gases when exposed to open flames.

• GB/T 12706
• GB/T 19666
• GB 31247 (LSZH cable testing standards)
• GB 50016 (Code for Fire Protection Design of Buildings)
• GB 51348 (Standard for Electrical Design of High-rise Civil Buildings)

• IEC 60228
• IEC 60332-1
• IEC 61034 (Smoke density testing)
• IEC 60754 (Halogen emission testing)

Unlike NH-YJV (which offers only fire resistance and uses a PVC sheath that emits copious toxic smoke during combustion) and VV/VLV (which utilize halogenated PVC materials that release highly toxic gases during a fire), WDZA-YJY integrates four key safety attributes: flame retardancy, low smoke emission, zero-halogen content, and low toxicity. It is a mandatory cabling product for super-high-rise buildings, subways, hospitals, and underground complex projects.

• Standard low-voltage rating: 0.6/1kV (covering over 95% of public building and municipal underground power distribution projects)
• Custom medium/low-voltage option: 1.8/3kV, suitable for auxiliary power distribution circuits in underground utility tunnels

• Single-core WDZA-YJY: 1.5mm² – 630mm²
• Multi-core WDZA-YJY: 2/3/4/5-core and composite core configurations (3+1 / 3+2 / 4+1); cross-section range: 1.5mm² – 400mm²
• Conductor Material Specifications: 99.99% pure T2-grade oxygen-free copper, utilizing a compact stranding process to minimize inter-strand gaps and enhance current-carrying capacity.

• Long-term permissible operating temperature: 90°C; higher current-carrying capacity than 70°C PVC-insulated (VV type) cables
• Short-circuit withstand temperature: Withstands 250°C for 5 seconds without insulation melting or dielectric breakdown
• Class A flame retardancy: Passes IEC 60332-3A bunched vertical flame spread test; does not propagate fire during large-scale bunched installation
• Low-smoke performance (Class A standard): Smoke light transmittance ≥90% during combustion, maintaining clear visibility for evacuation
• Halogen-free performance: Halogen gas emission <0.5%; produces no corrosive hydrogen chloride gas, preventing damage to firefighting equipment and human respiratory tracts
• Minimum installation bending radius: 12 times the outer diameter for multi-core cables; 15 times the outer diameter for large-cross-section single-core cables
• Installation ambient temperature range: -20°C to +70°C; supports outdoor installation in winter without preheating
• Factory withstand voltage test: Finished cable withstands 3.5 kV AC voltage for 5 minutes without insulation breakdown

• Small cross-section (1.5–10 mm²): Wiring for emergency lighting, evacuation signage, and fire alarm branch circuits.
• Medium cross-section (16–185 mm²): Main power feeders for building evacuation systems; power supply for medical equipment in hospital wards.
• Large cross-section (240–630 mm²): Main incoming feeders for substations; main fire safety power cables for underground shopping complexes.

As a premium Class A LSZH cable, the WDZA-YJY produces only minimal, thin white smoke during combustion and releases no toxic halogenated acidic gases. In a fire emergency, this characteristic helps maintain visibility along evacuation routes, reduces the risk of crowd stampedes, and prevents irreversible respiratory damage to rescue personnel. This performance metric is a mandatory tender requirement for all super-high-rise buildings and underground public infrastructure projects; standard YJV or NH-YJV cables cannot meet the acceptance criteria.

XLPE insulation supports a continuous operating temperature of 90°C, which is 20°C higher than that of traditional PVC-insulated (VV-type) cables. For the same conductor cross-section, WDZA-YJY cables provide a 15%–25% higher stable current-carrying capacity, making them suitable for layered installation in the dense vertical cable shafts of super-high-rise buildings. Their designed service life of 70 years aligns with the full lifecycle of large public buildings, thereby reducing mid-term costs associated with cable replacement and system retrofitting.

These cables pass rigorous Class A vertical bundled-cable combustion tests; when dozens of cables are densely installed within an enclosed shaft, flames do not spread vertically along the cable bundle. This effectively prevents the upward propagation of fire within high-rise electrical shafts, fully complying with the strict fire safety design requirements of the GB 51348 standard for super-high-rise buildings.

The Low-Smoke Zero-Halogen (LSZH) polyolefin sheath exhibits excellent low-temperature performance, allowing for standard installation at -20°C without sheath cracking. Additionally, the sheath offers resistance to UV radiation and mild acid/alkali corrosion, making it suitable for complex environments—such as indoor cable trays, underground utility tunnels, semi-open cable trenches, and tunnels—without the need for additional protective conduit modifications.

XLPE insulation material features an extremely low dielectric loss factor, enabling voltage drop during long-distance power transmission to be kept to a minimum; this makes it suitable for kilometer-scale underground tunnel power distribution mains. Its long-term operational energy loss is significantly lower than that of PVC-insulated cables, helping property managers reduce annual electricity costs for public facilities.

Toxicity test metrics meet top-tier international standards, ensuring that smoke generated during combustion does not cause rapid loss of consciousness among trapped individuals. Tender documents for airports, subway stations, and large hospitals explicitly specify WDZA-YJY Class A low-smoke, halogen-free cables, strictly prohibiting the use of other cable types for critical evacuation circuits.

• Super-high-rise civil and commercial buildings (height exceeding 100 meters)
  • Power supply for fire-fighting elevators, main lines for emergency lighting, control circuits for smoke exhaust fans, and main power lines for evacuation signage
• Underground public space infrastructure
  • Power distribution for metro platforms and tunnels, underground utility tunnels, fire control circuits for underground shopping malls, and ventilation lines for urban road tunnels
• High-occupancy public service buildings
  • Inpatient buildings of large Grade-A hospitals, teaching buildings for primary and secondary schools, large exhibition centers, airport terminal departure lounges, and evacuation power systems for libraries
• New energy public infrastructure projects
  • Fire linkage circuits for large charging stations, auxiliary power for public energy storage facilities, and public evacuation lines for hydrogen energy parks
• Key government municipal tender projects
  • Municipal cultural centers, urban disaster prevention and refuge sites, and underground power distribution systems for central plazas

• Voltage Rating Selection: Standard 0.6/1kV WDZA-YJY cables are used for typical indoor public buildings, subways, and underground shopping malls; custom 1.8/3kV models are selected for long-distance auxiliary power distribution in utility tunnels.
• Cross-Section Calculation Logic: Leveraging the high current-carrying capacity of XLPE (cross-linked polyethylene) insulation, the load current is calculated based on the total equipment power, with a 15% margin reserved for future load expansion. This approach avoids the need to blindly increase the cross-section—as is often required with VLV aluminum-core cables—thereby achieving an optimal balance between safety performance and material costs.
• Core Selection Standards: Single-phase emergency lighting branch circuits utilize 3-core WDZA-YJY cables; three-phase fire pump main lines utilize 4-core cables; and circuits for medical equipment requiring grounding protection utilize 3+1 or 4+1 composite-core cables.
• Application Notes for Specific Scenarios: The Low-Smoke Zero-Halogen (LSZH) sheath of WDZA-YJY cable has limited resistance to highly corrosive chemical liquids; therefore, in environments with persistent corrosive substances—such as chemical plant workshops—fully enclosed steel conduit protection is required. For non-emergency circuits in low-rise residential buildings (excluding public areas), WDZB-YJY (Class B flame-retardant) cables may be selected to reduce procurement costs.

• Installation in Super-High-Rise Building Shafts: Install fixing brackets at 1.5-meter intervals to prevent the cable's own weight from causing tensile stress that could damage the internal LSZH sheath; when installing cables in bundles, maintain a 30% spacing gap for heat dissipation to prevent current-carrying capacity reduction due to temperature rise.
• Bending Limitations: Strictly adhere to minimum bending radius standards; excessive bending can cause the LSZH outer sheath to crack and compromise the flame-retardant structure.
• Tunnel and Direct-Burial Installation Requirements: For direct-burial installation, lay a bedding layer of fine sand above and below the cable and cover it with protective bricks; for installation in subway tunnels, use fire-resistant cable supports to isolate the risk of fire spread.
• Installation Temperature Control: Installation is permitted in low-temperature environments down to -20°C without the need for pre-heating, making it suitable for municipal engineering projects in northern regions during winter.

• Pre-order qualification verification: Confirm that the supplier provides CCC mandatory certification, third-party test reports for IEC low-smoke zero-halogen (LSZH) compliance, and Class A flame-retardant inspection certificates.
• Spot checks upon arrival: Verify clear printing on the outer sheath (WDZA-YJY) and inspect the tightness of the copper core and the uniformity of the XLPE insulation layer thickness; for government super-high-rise building and metro projects, samples must be taken for spot checks regarding smoke density and halogen emission levels.
• Delivery schedule planning: For bulk orders involving large-scale municipal projects, metro lines, or super-high-rise buildings, orders should be placed 12 to 18 working days in advance to allow sufficient time for raw material production and third-party spot checks, thereby preventing construction work stoppages.

• Full Domestic Compliance: Fully compliant with the GB 31247 mandatory testing standards for Low-Smoke Zero-Halogen (LSZH) cables and the GB 51348 Code for Electrical Design of Super High-Rise Buildings; all performance metrics meet the acceptance and audit requirements of housing and urban-rural development authorities as well as fire rescue agencies.
• International Standard Alignment: Passes international fire safety tests such as IEC 60332, IEC 61034, and IEC 60754; test reports are suitable for tender submissions and project registration for overseas municipal, airport, and hospital projects.
• Comprehensive One-Stop Documentation Package: Includes CCC certification, Class A LSZH test reports, bunched-cable flame retardancy inspection records, factory inspection reports, quality certificates for raw materials (copper and LSZH plastics), technical parameter compliance tables for tenders, and special VAT invoices.
• Batch Quality Consistency Control: Each production batch utilizes standardized LSZH polyolefin formulations and XLPE cross-linking processes; deviations in metrics such as smoke density, halogen content, and flame retardancy are strictly controlled within narrow limits, thereby eliminating the risk of project acceptance failure due to substandard product batches.

We offer a full range of specifications, from 1.5mm² branch cables for evacuation systems to 630mm² large-cross-section trunk cables; ample stock of standard models for public infrastructure projects ensures rapid delivery. We support customization options such as upgraded fire resistance (via dual-layer mica tape), cut-to-length services, and laser-printed project-specific markings on the sheath, providing a one-stop procurement solution for LSZH fire-resistant cables without the need to coordinate with multiple suppliers.

We utilize imported LSZH masterbatches and premium-grade T2 virgin oxygen-free copper, strictly rejecting recycled, low-quality halogen-free plastics that fail to meet smoke emission standards. Our four-tier inspection system includes: halogen and smoke testing of incoming raw materials, in-line monitoring of conductor stranding, real-time measurement of XLPE insulation thickness, and batch-based "Class A" flame-retardancy sampling of finished cables. This rigorous approach eliminates common quality defects—such as excessive smoke, excessive halogen content, and inadequate flame retardancy—often found in products from smaller manufacturers.

By eliminating intermediary markups, we offer tiered bulk-purchase discounts for massive orders destined for projects such as subways, hospitals, and super-high-rise buildings. Our senior electrical engineers provide complimentary services, including load current calculations, optimization of shaft installation plans, and recommendations on conductor cross-section selection. We assist clients in selecting the most cost-effective WDZA-YJY cable specifications—while ensuring compliance with Class A fire safety standards—thereby reducing the project's total expenditure on electrical materials.

Our in-house engineering team possesses over 15 years of experience in public project design, offering full-lifecycle technical services. These include consulting on emergency evacuation circuit design, providing WDZA-YJY current-carrying capacity data sheets, preparing responses regarding fire safety specifications for tenders, and offering guidance on compiling documentation for fire safety inspections. For government tenders involving subways and super-high-rise buildings, we assist in creating comparative tables of fire safety specifications that meet rigorous requirements, significantly boosting the general contractor's chances of winning the bid.

Equipped with 12 continuous XLPE cross-linking extrusion lines, the facility achieves a daily output of tens of thousands of meters of WDZA-YJY cable and maintains large-scale warehouses for LSZH (Low-Smoke Zero-Halogen) plastic and copper raw materials. Even for massive orders—such as those for city-wide metro lines or new hospital complexes—delivery is guaranteed within the agreed timeframe, eliminating the risk of construction delays caused by cable shortages.

All supplied WDZA-YJY cables come with a 15-year manufacturer's quality warranty covering fire safety specifications. Should technical challenges arise during installation, the technical team provides remote video guidance within 24 hours; for long-term partners—including municipal engineering firms and hospital developers—complimentary on-site technical training on fire-safe installation practices is available. Dedicated profiles are established for bulk-purchase clients, allowing for the advance stockpiling of raw materials based on project schedules and thereby shortening delivery times for subsequent reorders.

WDZA-YJY Class A Low-Smoke Zero-Halogen (LSZH) XLPE-insulated power cable is the mandatory specified cable for evacuation and fire control circuits in super-high-rise buildings, subway tunnels, large hospitals, airports, and various densely populated underground public infrastructure facilities. Combining Class A smoke suppression, zero-halogen/low-toxicity properties, high-temperature resistant XLPE insulation, and bundled flame-retardant capabilities, this product meets the highest fire safety design standards for modern public works. It effectively eliminates safety hazards—such as toxic smoke emission and fire propagation—associated with traditional PVC-insulated cables during fire incidents.

As a professional manufacturer of WDZA-YJY cables holding both domestic CCC certification and international IEC fire safety testing qualifications, we provide a comprehensive range of standardized LSZH cables, complete documentation for acceptance and certification, and specialized technical consulting services for fire safety electrical systems. We serve global municipal engineering groups, hospital construction contractors, subway design institutes, and bulk procurement teams, helping key public safety projects successfully pass fire safety regulatory reviews and engineering quality inspections, while ensuring full-lifecycle safety and cost-optimized control for fire evacuation and power distribution circuits.