Fire Survival LSZH Fixed Wiring Cable for Fire Priority Critical Buildings

WDZN-YJY is a low-smoke halogen-free fire-resistant power cable with a rated voltage of 0.6/1kV. It is specifically developed for emergency critical power supply circuits in Class I fire-resistant buildings and important infrastructure, and can maintain continuous power supply for the specified duration of a fire in flame-prone environments.

WDZ:

Low-smoke halogen-free; the insulation layer, filler layer, and outer sheath are all made of halogen-free environmentally friendly polymers without any PVC halogen components;

N:

N-class fire-resistant structure; a specially optimized fire-resistant composite coating layer is used between the conductor and the insulation layer to achieve fire resistance;

YJ:

Copper conductor with cross-linked polyethylene (XLPE) insulation;

Y:

Modified low-smoke halogen-free extruded outer sheath, unarmored lightweight integral structure.

Unlike the commonly available WDZB-YJY flame-retardant cables and PVC YJV cables, WDZN-YJY cables combine the low-smoke and environmentally friendly characteristics of LSZH cables with overall fire-resistant emergency power supply capabilities. They not only effectively suppress flame spread like flame-retardant cables, but also maintain circuit integrity under standard fire resistance test conditions. They can be used as fixed wiring for critical emergency load circuits such as fire pumps, fire elevators, smoke exhaust fans, and UPS backup power supplies. The product range includes single-core, 3-core, 4-core, 5-core, and 3+1/3+2 multi-core combinations to meet the diverse emergency power distribution design needs of electrical design institutes.

• Rated Operating Voltage U0/U: 0.6/1kV, suitable for 50Hz AC civil and industrial low-voltage emergency power grids;
• Long-term Allowable Continuous Operating Temperature of Copper Conductor: 90℃ under rated normal load operation;
• Maximum Allowable Temperature for Instantaneous Short Circuit (within 5 seconds of short circuit): 250℃;
• Conventional Factory Power Frequency Withstand Voltage Test: 3.5kV/5min, no insulation breakdown;
• Core Fire Resistance Performance Indicator: Passes the N-level fire integrity test, maintaining circuit continuity within the specified flame temperature and burning duration, ensuring continuous power supply to emergency equipment;
• XLPE Insulation Characteristics: Low dielectric loss, stable insulation resistance under high humidity and temperature fluctuations, reducing power consumption in long-distance emergency lines.

• Conductor Standard: Class 2 tightly stranded annealed copper conductor conforming to IEC60228 and GB/T3956 standards. Tight stranding reduces the risk of localized electric field concentration.
• Conductor Cross-sectional Area Range: Standard stock sizes 1.5mm²~300mm²; custom sizes 400~630mm² and non-standard special core material combinations can be customized according to engineering drawings.
• DC Resistance Control: The conductor's DC resistance at 20℃ is strictly controlled below the standard upper limit, optimizing voltage drop during long-distance emergency power transmission.

• Conductor + Special Fire-Resistant Coating: High-temperature mica-based fire-resistant tape tightly wraps the copper core, ensuring N-level fire resistance;
• XLPE Insulation Layer: High-purity cross-linked polyethylene, uniformly extruded thickness, with excellent heat resistance and puncture resistance;
• Halogen-Free Flame-Retardant Filler: Low-smoke halogen-free environmentally friendly filler fills the core wire gaps, standardizes the cable outer diameter, and improves the fire resistance of the entire cable bundle;
• Modified Anti-Aging Low-Smoke Halogen-Free Outer Sheath: Added UV-resistant and hydrolysis-resistant additives, suitable for humid indoor environments and slightly corrosive environments.

• Minimum fixed laying ambient temperature ≥ 0℃;
• Minimum installation bending radius ≥ 12 times the outer diameter of the finished cable;
• Standard applicable laying altitude ≤ 3000m; High-altitude low-voltage versions can be customized for key high-altitude construction projects.

• N-Class Fire-Resistant Emergency Power Capacity: The unique mica fire-resistant coating structure has passed national and IEC fire integrity tests. In the event of a fire in the surrounding environment, the cable can maintain effective circuit continuity for a specified time, ensuring the normal operation of fire pumps, fire elevators, and emergency lighting. This is a core indicator for critical fire circuits.
• High-Quality Low-Smoke Halogen-Free Safety: Combustion smoke penetration rate ≥70%, and no corrosive halogen acid gases are produced after combustion, ensuring evacuation visibility in enclosed basements, electrical shafts, and other locations, and preventing corrosion of precision emergency power distribution equipment.
• Stable Cross-Linked Polyethylene (XLPE) Insulation Electrical Reliability: Small capacitance fluctuations under load changes ensure stable operation and uninterrupted emergency power transmission for critical loads.
• Lightweight, unarmored structure advantages: No metal armor results in a smaller outer diameter and lighter unit weight, saving on cable tray and trough procurement costs and installation space.
• Excellent environmental protection and anti-aging performance: The optimized low-smoke halogen-free sheath resists the corrosion of humid indoor environments and trace industrial volatile gases, with a design service life of up to 25 years under standard fixed installation conditions.
• Bundled flame-retardant matching performance: Combined with internal halogen-free flame-retardant filler, dozens of cables can be densely laid in the cable tray, effectively limiting the spread of flames along the cable path.

• Upgraded Fire Resistance: Ordinary WDZB only retards flames and prevents the spread of fire, but cannot maintain electrical continuity during a fire; WDZN uses an additional fire-resistant mica sheath, maintaining power integrity even in open flames, meeting the mandatory requirements for emergency fire-fighting equipment power supplies in global fire protection codes;
• Upgraded Full-Layer Halogen-Free Formula (Compared to PVC Fire-Resistant Cables): Traditional fire-resistant cables use halogen-containing PVC sheaths, which release harmful corrosive fumes when burning; our full LSZH configuration meets LEED green building and international fire protection certification requirements;
• Flexible Customized Production Mechanism: Supports small-batch short-line trial orders, customized irregular core layouts, and mixed-specification consolidated shipments to reduce the buyer's inventory capital tied up;
• Strict Full-Process Factory Inspection: Employs an automated continuous extrusion production line equipped with online insulation thickness detection. Each batch of products undergoes third-party fire resistance and smoke density sampling tests before leaving the warehouse to ensure batch stability.

• Primary Hospital and Medical Complex Construction: Hospital fire pumps, fire elevators, emergency lighting, ICU backup UPS power supply main cabling, centralized cabling in enclosed equipment rooms in basements; local fire safety regulations explicitly require the use of Class N fire-resistant, low-smoke, halogen-free cables for medical emergency circuits.
• Large-scale Integrated Transportation Hubs: Airport terminals, high-speed rail stations, emergency fire equipment power supply main lines, underground passage emergency power distribution cabling, priority cable designation in enclosed public spaces.
• Super High-rise Commercial and Residential Buildings: High-rise building fire equipment dedicated power cables, vertical shaft emergency circuit cabling, fixed cabling for underground garage smoke exhaust fans.
• Underground Integrated Pipe Gallery and Subway Auxiliary Projects: Urban integrated pipe gallery fire emergency power cables, subway station smoke exhaust and emergency lighting power distribution lines, cabling in enclosed tunnels with strict fire safety regulations.
• Large Data Centers and Smart Parks: IDC server room fire equipment dedicated power circuits, backup generator incoming lines, cabling in centralized electrical rooms with fire risk.

• Emergency Dedicated Circuit Installation Requirements: WDZN-YJY cables for fire protection equipment should be installed independently from conventional power cables, avoiding bundling with ordinary non-fire-resistant cables in the same conduit, and comply with fire safety acceptance standards.
• High-Rise Shaft Installation Recommendations: For emergency power lines in the shafts of super high-rise buildings, WDZN-YJY full LSZH fire-resistant cables are preferred to ensure successful final acceptance by the fire department.
• High Humidity Underground Space Layout: For basement and underground utility tunnel projects, use customized versions with moisture-proof enhanced LSZH sheaths to extend cable lifespan.
• Green Building Bidding Projects: All critical emergency power circuits should uniformly use WDZN-YJY cables to meet the requirements of green building certification technical clauses.

Key audit points from multiple perspectives, including EPC procurement managers, engineering contractors, and overseas electrical distributors:

• Raw Material Qualification Audit: Suppliers are required to provide third-party testing certificates for low-smoke halogen-free compounds and fire-resistant mica tape before signing bulk orders, confirming that no inferior recycled raw materials are mixed into the finished cables;
• Pre-shipment Third-Party Testing Clause: A random sampling inspection agreement should be included in the sales contract, allowing the buyer to designate a local authorized laboratory to test fire resistance, smoke density, and electrical properties before container loading;
• Pre-order Specifications Matching Confirmation: Submit the project's emergency power distribution diagram and laying environment to our technical department. Our professional low-voltage engineers will optimize the selection of cross-sections and core wire combinations to avoid on-site rework losses due to incorrect procurement models.
• Delivery Cycle Planning: Standard mainstream specifications are readily available from the factory, with fast delivery within 5-7 working days. For non-standard customized products, a fixed production plan is confirmed during the pre-purchase negotiation stage to coordinate with the overall project construction schedule.
• Export Packaging Optimization: Export-specification cables are packaged in moisture-proof wooden rolls and sealed with plastic film. The logistics team optimizes container stacking layout to improve space utilization and reduce unit sea freight costs for bulk importers.

WDZN-YJY series products have all passed authoritative testing and can provide complete English certification documents for overseas bidding and customs clearance at the port of destination:

• Domestic Standards: GB/T12706 Low-voltage Power Cable Standard, GB/T19666 Flame-retardant and Fire-resistant Cable Specification;
• International Standards: Compliant with the core clauses of IEC60502, IEC60332, and IEC61034, and conforming to the electrical access specifications of major importing countries in Southeast Asia, the Middle East, Central Asia, and Africa;
• Complete Qualification Documents: CCC mandatory certification, fire-resistant product type approval certificate, CNAS accredited laboratory test report, ISO9001 quality management system certification and ISO14001 environmental management system certification, as well as a complete set of English certification documents for preparing tender documents;
• Customs Clearance Assistance Services: Assisting the buyer in issuing certificates of origin and relevant customs support documents to shorten customs clearance time at the port of destination.

• Professional Dedicated Electrical Engineering Team: We have senior R&D engineers specializing in low-voltage cables who can provide free consultation on pre-order specifications based on emergency power supply design drawings, and offer remote online construction technical guidance to on-site engineering teams.
• Full-Process Traceable Quality Management: Each roll of finished cable has a unique batch tracking code, covering raw material inspection, online production monitoring, and finished product sampling inspection, facilitating full-cycle quality traceability during project acceptance.
• Diverse International Trade Cooperation Terms: We support multiple settlement methods including FOB/CIF/CFR, offering a dual cooperation model of small-batch trial orders and annual long-term framework contracts. Long-term partners can enjoy tiered bulk purchase discounts.
• Stable Inventory and Global Logistics Coordination: We regularly update general specifications and factory inventory in real time. We collaborate with multiple top international freight forwarders to develop cost-effective transportation solutions, avoiding delivery delays caused by port congestion.
• Flexible Capacity Reserved: We reserve some production line capacity for long-term strategic partners to quickly respond to unexpected emergency replenishment orders during the later stages of project construction.