WDZ-YJY Low Smoke Zero Halogen Flame Retardant XLPE Insulated Power Cable for Indoor Wiring, Public Buildings & Fire Safety Engineering
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- WDZ: Low-smoke, halogen-free, and flame-retardant properties
- YJ: Cross-linked polyethylene (XLPE) insulation
- Y: Low-smoke, halogen-free polyolefin outer sheath
WDZ-YJY is a widely used unarmored, flame-retardant power cable designed for fixed indoor power transmission and distribution lines. It features solid or stranded oxygen-free copper conductors, XLPE insulation, and a halogen-free, flame-retardant outer sheath; its formulation meets the stringent fire safety standards required for densely populated public areas. When exposed to fire, the cable emits only minimal, faint smoke and releases no corrosive or toxic halogen gases, thereby maintaining indoor visibility to facilitate orderly evacuation while inhibiting the spread of flames along the cable run.
Unlike traditional PVC-sheathed YJV cables, which emit dense smoke and acidic gases when burning, WDZ-YJY cables are the mandatory cabling type specified in the electrical designs of many modern buildings for fire-safety-related circuits. This cable is frequently selected by electrical design institutes, general contractors, property engineering teams, electrical wholesalers, and project tendering authorities for new construction and electrical upgrade projects involving public facilities, high-rise residential buildings, and commercial complexes. The product complies with mandatory domestic inspection standards and comes with the necessary test documentation, facilitating the smooth completion of project filing, fire safety inspections, and final project acceptance procedures.
- National Standards: GB/T 12706, GB 31247 (Performance specifications for low-smoke, halogen-free cables), GB/T 19666 (Classification standards for flame-retardant grades)
- International Reference Standards: IEC 60502-1, IEC 60332-3 (Vertical flame spread test), IEC 60754 (Halogen content test), IEC 61034 (Smoke density measurement)
- Customizable Flame-Retardant Grades: Options such as WDZA, WDZB, and WDZC are available to meet specific project design requirements.
- Conductor
Utilizes Class 1 solid copper conductors or Class 2 compacted stranded oxygen-free copper conductors. These conductors feature high purity, low DC resistance, stable conductivity during long-term continuous operation, and strong oxidation resistance, effectively reducing line power losses in medium- to long-distance power supply layouts. Conductor cross-sectional areas range from 1.5 mm² to 400 mm², accommodating various load configuration requirements. - XLPE Insulation
Extruded cross-linked polyethylene (XLPE) insulation is utilized, with in-line eccentricity monitoring ensuring uniform and controlled insulation thickness. The material offers excellent thermal aging resistance, high dielectric strength, and strong resistance to partial discharge and ozone erosion, maintaining stable insulation performance even under long-term temperature fluctuations and load cycling. - Halogen-Free Filler and Inner Binder Tape
Environmentally friendly, halogen-free filler material is used between the insulated cores to ensure a circular cable profile, enhance crush resistance, prevent core twisting or displacement during bending and installation, and minimize internal frictional damage between the insulated cores. - LSZH Outer Sheath
An extruded low-smoke, zero-halogen (LSZH), flame-retardant polyolefin outer sheath is employed. It features flame retardancy, low smoke emission, and halogen-free combustion characteristics, while also offering excellent abrasion, moisture, and UV resistance, making it suitable for limited semi-outdoor installations.
| Rated operating voltage | Standard 0.6/1 kV; medium-voltage specifications available upon request for specific projects |
|---|---|
| Maximum permissible conductor operating temperature | 90°C (continuous operation) |
| 5-second short-circuit withstand temperature | Peak temperature of 250°C |
| Installation ambient temperature | Minimum 0°C; pre-heating required for installation below 0°C to prevent sheath cracking |
| Minimum bending radius during installation | Not less than 15 times the finished cable's outer diameter |
| Flame retardancy rating (Class A/B/C) | Customizable to meet specific fire safety design requirements |
|---|---|
| Combustion smoke transmittance | >60% (low-smoke, eco-friendly performance) |
| Halogen content | Zero halogen emissions; no corrosive acidic gases released during combustion |
| Heat release and smoke generation | Complies with Class B1 requirements for building fire-safety materials |
We offer a wide range of core configurations—including single-core, 2-core, 3-core, 4-core, and 5-core options, as well as composite structures like 3+1, 3+2, and 4+1—fully meeting the design requirements for three-phase three-wire, three-phase four-wire, and three-phase five-wire low-voltage power distribution systems.
Includes factory inspection reports, raw material certificates of conformity, flame-retardant performance test reports, smoke density and halogen content test reports, and product certificates of conformity. Additionally, we can facilitate CCC mandatory certification, CE certification, and other third-party testing certificates to satisfy qualification review requirements for overseas project tenders, customs clearance, and domestic government project filings.
In the event of a building fire, WDZ-YJY cables effectively inhibit flame propagation along the line, preventing widespread power failure in critical circuits such as emergency lighting, fire alarm controls, smoke exhaust fans, and fire pumps. In contrast, standard PVC-insulated cables burn rapidly during a fire and release large amounts of toxic smoke; this can easily obstruct evacuation and create secondary safety hazards, failing to meet the mandatory fire safety design standards for public buildings.
When burning, traditional PVC-sheathed cables emit dense black smoke and highly corrosive hydrogen halide gases, which can cause respiratory discomfort and corrode nearby electrical cabinets, control equipment, and metal components. In contrast, WDZ-YJY cables produce only a small amount of light smoke and release no toxic halogen gases during combustion, meeting green building assessment criteria and environmental acceptance standards for public building projects.
High-purity copper conductors effectively minimize energy loss during power transmission, while the cross-linked polyethylene (XLPE) insulation offers excellent aging resistance, supporting stable, continuous operation for over 25 years under standard installation conditions. This reduces the frequency of inspections, maintenance, and cable replacements required by property operators and project owners, thereby lowering the overall operating costs of the building's electrical system.
Its lightweight, unarmored structure facilitates transportation, pulling, and conduit threading during installation. The product is suitable for various applications, including installation in cable shafts, cable trays, buried conduits, wall cavities, and ceiling spaces; compared to armored cables, the overall installation is less complex and involves lower labor costs.
The WDZ-YJY cable model is widely specified in electrical design standards for public buildings and key municipal projects. Comprehensive certification documentation is available and can be organized for specific project requirements, helping procurement teams efficiently pass fire safety inspections, project filings, and final acceptance checks, thereby mitigating risks associated with non-compliant qualifications during the tendering process.
Suitable for high-rise apartments, office buildings, shopping centers, large commercial plazas, and other venues with stringent fire safety requirements. Applications include main power supply lines and distribution feeders within electrical shafts, dedicated emergency lighting circuits, connections for fire control cabinets, elevator backup power circuits, and power distribution wiring for public corridors.
Suitable for backup power circuits in academic buildings, student dormitories, hospital wards, and operating rooms, as well as internal power distribution wiring for libraries, museums, exhibition halls, sports venues, and nursing homes. Fire safety regulations for such venues impose strict limits on the emission of toxic gases and smoke from electrical materials during a fire.
Electrical upgrades to power distribution systems in older residential complexes, installation of main distribution lines for underground parking facilities, modification of dedicated fire-safety circuits, and modernization of public area lighting systems to ensure compliance with the latest urban fire safety regulations.
Installation of internal cable trays and control circuits for surveillance and ventilation systems, as well as emergency power wiring for public areas within underground pedestrian underpasses; designed to meet requirements for low-smoke, eco-friendly materials in enclosed underground public spaces.
This scope covers cabling for fire alarm linkage circuits, UPS backup power branch lines, and access control and surveillance systems within server rooms and smart office buildings, ensuring compliance with design requirements regarding fire separation and environmental standards in areas with high concentrations of electronic equipment.
A general contractor undertook the electrical installation for an office building project in a Central Business District. The original design specified standard YJV cables, which failed to meet updated local fire safety acceptance standards. Following consultations with the design institute, the project switched to WDZ-YJY series cables for all emergency circuits and main distribution lines in public areas. Our team provided samples for testing prior to bulk ordering, compiled a comprehensive set of test reports and certification documents for the tender and filing processes, implemented a phased delivery schedule aligned with the construction timeline, and dispatched technical personnel to provide on-site guidance on proper cable pulling and routing practices. Upon completion, the project successfully passed both the fire safety inspection and the final overall acceptance inspection.
The local education bureau launched an electrical safety upgrade project for older school campuses, mandating the use of low-smoke, zero-halogen (LSZH), flame-retardant cables for wiring in public areas, dormitory power distribution, and fire alarm circuits to enhance fire safety. The design institute specified the WDZ-YJY cable model. To meet site installation requirements, we provided custom cut-to-length services to minimize construction waste, compiled certification documentation for the education bureau's review, optimized the bill of materials to prevent inventory overstocking for the contractor, and executed phased deliveries according to schedule. After one year of operation, all circuits maintained stable temperatures and performance metrics.
A property engineering firm procured a large volume of multi-core WDZ-YJY cables to upgrade the wiring for fire pumps, smoke exhaust fans, and emergency lighting across multiple underground garages. Addressing the challenges of complex internal routing and high total cable volume, our factory organized centralized production and unified distribution. We provided customized cable reel labeling to facilitate on-site sorting and identification, supported small-batch replenishment to cover installation wastage, and established a long-term supply partnership with the client to support subsequent phases of the renovation project.
- Low-Temperature Construction Management: Cable pulling and laying operations must not be performed when the ambient temperature is below 0°C. If winter installation is unavoidable, slow preheating measures must be implemented to prevent the outer sheath from cracking due to forced bending.
- Bending Radius Control Standards: Minimum bending radius requirements must be strictly observed during operations such as conduit threading, navigating turns in cable trays, and vertical shaft installation. Excessive bending can compress internal insulated cores and damage the insulation structure, creating a risk of insulation breakdown during long-term operation.
- Categorized Arrangement in Cable Trays: When WDZ-YJY cables are laid alongside ordinary non-flame-retardant cables in the same tray, separation barriers must be installed in accordance with electrical design standards to retard flame spread in the event of a fire.
- Standardized Termination: Cable ends must be crimped using compatible terminals, and the connections must be reliably insulated and sealed. Inadequate crimping can lead to localized overheating during long-term operation under load, thereby accelerating the aging of the insulation layer.
- Recommendations for installation in damp environments: When installing cables in damp cable shafts or enclosed underground utility conduits, please install compatible waterproof sealing accessories at cable entry and exit points. This prevents moisture ingress into the conductor cores, which could otherwise compromise insulation performance.
- Storage guidelines (warehouse and site): Finished cable reels should be stored in a dry, well-ventilated indoor warehouse. Avoid prolonged exposure to direct sunlight or rain to delay sheath aging and embrittlement. Ensure reels are stacked stably to prevent deformation caused by crushing or compression.
- Full-specification customization capabilities to meet project drawing requirements
We manufacture WDZ-YJY cables covering a wide range of cross-sectional sizes and core configurations. We offer services such as cut-to-length delivery, custom sheath colors, reel-side inkjet marking, and personalized packaging solutions based on client construction drawings. Should wiring designs require adjustment, our technical team is available to assist designers with load calculations, cable selection verification, and scheme optimization. - Strict Quality Control Across Raw Materials and Production
We use only high-purity copper rods, compliant XLPE insulation materials, and certified LSZH (Low Smoke Zero Halogen) sheathing materials. Every batch undergoes DC resistance testing, insulation resistance checks, and spot inspections for flame retardancy and smoke performance before leaving the factory, ensuring consistent quality for large-scale engineering orders. - Comprehensive Documentation Services Covering Tendering to Acceptance
We compile complete documentation packages—including factory inspection reports, raw material certificates, fire performance test records, and product certificates—tailored to specific requirements such as government tenders, project filings, fire safety inspections, and overseas customs clearance. This service significantly saves procurement teams time and effort regarding document organization and qualification verification. - Flexible Order Volumes and Global Logistics Solutions
We accommodate everything from small-batch sample orders for preliminary project validation to medium-batch stock production and large-scale bulk supply for major infrastructure projects. We offer "door-to-door" delivery for domestic projects; for overseas orders, we provide sea-worthy wooden reel packaging, container loading arrangements, and comprehensive export documentation coordination. - Professional Electrical Technical Support Team
Our senior electrical engineers provide a range of complimentary services, including ampacity verification, cable selection optimization, consultation on installation layouts, preparation of bills of quantities, and technical coordination with design institutes. We respond rapidly to on-site issues—such as wiring, connections, and troubleshooting—providing timely assistance to engineering teams to resolve technical challenges and ensure project schedules remain on track. - Stable Pricing Policy for Long-Term Framework Partnerships
For engineering contractors, electrical distributors, and clients with ongoing bulk procurement needs, we offer long-term framework agreement pricing, tiered volume discounts, and raw material price-locking options. These measures help stabilize project procurement budgets and protect clients against the risks associated with copper price fluctuations in long-term projects.
