Copper Power Cable For High-Rise Building Fire Lifeline, Long-Distance Emergency Circuit & High-Temperature Enclosed Cable Trunking

NH-YJV fire-resistant cross-linked polyethylene insulated power cables are manufactured entirely in accordance with the national standard GB/T 12706.1-2020 "Cross-linked Polyethylene Insulated Low-voltage Power Cables"; their core fire resistance performance strictly adheres to GB/T 19665 "Test Specification for Fire-resistant Cables", conforms to the international standard IEC 60502-1, and meets EU CE LVD and EMC directives, satisfying domestic fire safety regulatory filing and cross-border public building infrastructure bidding and customs clearance requirements.

All finished cable reels undergo comprehensive third-party type testing in nationally accredited electrical laboratories, including NH-YJV's unique high-standard fire resistance testing items:

• 950℃ high-temperature flame burning + water spray impact 90-minute continuous power supply test
• Long-cycle high-temperature thermal aging test
• Power frequency withstand voltage test
• Insulation thermal deformation resistance test
• Vertical thermal radiation stability test
• Long-term damp heat immersion aging test

Every major fire safety lifeline engineering order comes with a complete set of official filing documents stamped by the factory, free of charge:

• National Power Industry Full Type Test Report
• NH Fire-Resistant Special 90-Minute Survival Performance Test Certificate
• Batch Factory Inspection Records
• T2 Oxygen-Free Copper Raw Material Inspection Certificate
• CE Certificate
• Independent Full Batch Traceability Archives
• NH-YJV Dedicated Long-Distance Pipeline Shaft and Cable Tray Fire Emergency Laying and Terminal Production Operation Manual

All documents fully comply with the standards for high-rise building fire protection supervision filing, construction supervision review, fire safety acceptance of large public places, and overseas commercial building EPC bidding review.

High-density circular stranded pure copper core, with DC resistivity strictly controlled below the national standard upper limit. Ultra-low resistivity effectively suppresses voltage drop during emergency power transmission in long-distance vertical shafts and underground pipelines, ensuring stable continuous current carrying capacity for fire pumps, smoke exhaust fans, emergency elevators, and fire control center equipment under 24-hour full-load operation. The high density ratio reduces the cable outer diameter, saving space for cable trays and conduits for construction teams. The raw materials are 100% new oxygen-free copper, without any recycled copper, ensuring consistent conductivity across all batches.

Two layers of interlaced, high-purity inorganic mica tape are tightly wrapped around each insulated core wire, forming a robust high-temperature isolation barrier. Mica material will not melt, carbonize, or crack under ultra-high temperature flames of 950℃, effectively isolating flames and heat radiation, protecting the internal conductive copper core, and ensuring uninterrupted power supply in the event of a fire. This inorganic flame-retardant barrier is the fundamental difference between NH series flame-retardant cables and ordinary ZR flame-retardant cables that can only suppress the spread of flames.

The mica-coated layer is coated with a special cross-linked polyethylene composite material, enabling long-term sustainable operating temperatures up to 90°C, 20°C higher than NH-VV's PVC insulation layer. Even under continuous high-temperature accumulation in enclosed electrical shafts and dense cable trays, the XLPE insulation layer will not soften, deform, or age rapidly, meeting the design requirements of long-distance heavy-load emergency circuits. Combined with double-layer mica tape, it forms a dual fire-resistant safety protection system.

Moisture-proof elastic filler fills the gaps between the multi-core insulated wires, forming a neat, round cable profile. This eliminates air convection channels within the cable bundle during a fire, slows internal heat transfer, and improves the overall fire resistance of the multi-core cable bundle.

The seamless extruded PVC outer sheath encases the multi-core insulation assembly, preventing indoor moisture, basement condensation, alkaline concrete deposits, and mildly corrosive indoor gases from eroding the internal mica fireproof layer and XLPE insulation core; the improved ozone and UV resistant formula supports indoor concealed pipes, vertical cable shafts, cable trays, and semi-outdoor wall pipe installation.

• NH-ZR-YJV: Composite fire-resistant + Class C bundled flame-retardant dual-performance model, suitable for densely stacked cable trays and emergency circuits in enclosed pipe corridors.
• Low-Temperature Fire-Resistant Improved NH-YJV: Suitable for outdoor fire emergency pipeline laying in northern high-altitude areas.
• Reinforced Moisture-Proof Outer Sheath: Customized for concealed fire pump pipelines in underground large parking lots, river embankments, and other water-containing soils.

• Rated AC Working Voltage: 0.6/1kV Low-Voltage Building Emergency Power Distribution System
• Power Frequency Withstand Voltage Test: 3.5kV, no breakdown or abnormal discharge for 5 consecutive minutes
• Insulation Resistance: XLPE insulation maintains ultra-high stability insulation resistance in long-term high-temperature enclosed shafts and damp basement laying environments.
• Reference Continuous Current Carrying Capacity: Under the same cross-sectional specifications, its current carrying capacity is higher than NH-VV. The PVC insulated fire-resistant cable is about 30% thicker, fully meeting the national design standards for heavy-duty circuits of long-distance fire pumps and emergency elevators.

• 90-Minute Fire Resistance Standard Compliance: Fully compliant with GB/T 19665 NH fire resistance standard; under the dual test conditions of continuous flame burning at 950℃ + periodic water jet impact, the cable can operate normally for 90 minutes without open circuit, breakdown, or short circuit, providing sufficient time for personnel evacuation and the operation of fire-fighting linkage equipment.
• Inorganic Mica High-Temperature Insulation Advantage: Double-layer mica tape forms a stable solid heat insulation layer under open flame, without melting and dripping, avoiding the risk of secondary fire caused by melting and dripping plastic.
• Essential Difference from ZR Flame-Retardant Cables: ZR only limits the continuous spread of flames along the cable surface; NH-YJV ensures uninterrupted power supply to critical fire-fighting equipment during fire disasters and is a mandatory standard item for core fire protection lifeline circuits in the electrical design codes of all high-rise and large public buildings.

• Minimum Allowable Bending Radius: 12 times the outer diameter of the finished cable, more flexible than armored cables, suitable for wiring in narrow shafts.
• Static Compression Resistance: Passes the national standard low-voltage cable compression destructive test; double-layer mica sheathing and XLPE insulation, no delamination, cracking, or permanent deformation.
• Laying Environment Temperature Standard: Standard model installation environment ≥0℃; low-temperature customized version supports laying at -20℃, no preheating required.
• Design Service Life under Standard Indoor Shaft and Concealed Pipe Laying Conditions: Over 35 years, longer than PVC insulated NH-VV fire-resistant cables.
• Resistance to Damp Heat Aging: Passes long-term continuous damp heat immersion test, suitable for laying fire equipment pipes in underground garages and basements where long-term dampness is a concern.
• Resistance to Chemical Corrosion: Resistant to long-term erosion from weakly alkaline concrete precipitates and trace amounts of indoor volatile corrosive gases.

Ordinary NH-VV PVC insulated fire-resistant cables can only withstand a long-term operating temperature of 70℃. When used in long-distance vertical cable shafts with densely bundled cables, heat accumulation can lead to accelerated insulation aging, voltage drop overload, and potential safety hazards. Ordinary non-fire-resistant ZR-YJV cables cannot pass the 90-minute high-temperature fire resistance test and are prohibited by fire protection regulations for use in fire pumps, emergency elevators, and smoke exhaust circuits. NH-YJV cables use a double-layer inorganic mica fireproof layer and a high-heat-resistant cross-linked polyethylene (XLPE) insulation layer, simultaneously meeting mandatory fire resistance performance indicators and long-distance heavy-load high-temperature stable operation requirements. This makes it the preferred cable type for core fire safety lifeline circuits in high-rise residential buildings, large hospitals, and shopping malls. Electrical design engineers can avoid rework during project acceptance due to insufficient temperature resistance or inadequate fire resistance by choosing NH-YJV cables.

Compared to NH-VV PVC insulated fire-resistant cables with the same conductor cross-section, NH-YJV XLPE insulated cables can operate stably at 90℃ and have a significantly higher continuous allowable current carrying capacity. For long-distance fire pump main lines and multi-story vertical shaft emergency power distribution lines, designers can choose smaller cross-section specifications to meet the same load requirements, thereby reducing the total cable procurement, conduit specifications, and cable tray size configuration, comprehensively reducing the raw material and construction auxiliary material costs for EPC contractors.

The ultra-low resistance copper conductor combined with a high-heat-resistant cross-linked polyethylene (XLPE) insulation layer effectively controls voltage loss during long-distance emergency power transmission over kilometers. For fire protection pipeline circuits installed in vertical shafts of super high-rise buildings over 100 meters high and long-distance buried in large underground commercial complexes, the NH-YJV avoids the situation of insufficient terminal voltage leading to fire protection equipment failure that often occurs with the NH-VV when used in ultra-long-distance circuits, ensuring the stable start-up and operation of fire pumps and smoke exhaust fans during fire accidents.

NH-YJV's complete specification library covers single-core to five-core cables, with cross-sectional areas ranging from 1.5mm² to 400mm². It can simultaneously meet the needs of emergency lighting branch circuits in small corridors of entire high-rise buildings or large commercial complexes, dedicated main lines for smoke exhaust fans, high-capacity incoming lines for fire pumps, and emergency elevator power supply. The procurement team only needs to liaise with one supplier to complete the procurement of all indoor fire-resistant emergency cables, simplifying incoming inspection sampling and classification, material acceptance testing, and on-site temporary warehouse management.

NH exclusive fire-resistant XLPE cable automated production line is equipped with real-time online monitoring equipment to monitor the double-layer mica tape wrapping overlap rate, XLPE insulation extrusion thickness, and outer sheath uniformity. The mica coating coverage, insulation thickness, and electrical performance of each batch of production are strictly controlled within a narrow standard tolerance range, eliminating the risk of inconsistent fire resistance ratings or unstable current carrying capacity between different cable reels, and avoiding delays in fire supervision and construction supervision acceptance caused by unqualified batches of fire-resistant cables.

• Super High-Rise Residential Projects: Main cables for emergency elevators and fire pumps in high-rise building shafts; concealed conduit cables for smoke exhaust fans and fire alarm systems in underground parking garages; emergency evacuation lighting distribution lines in multi-story corridors.
• Class A Large-Scale Public Medical Infrastructure: Dedicated power cables for the central fire control room of tertiary hospitals; backup emergency circuits for life support equipment in wards; long-distance buried main cables for fire pumps in hospital basements.
• Large-Scale Integrated Commercial Complexes: Enclosed cable trays for fire equipment distribution in supermarkets and underground shopping malls; densely bundled emergency lighting and smoke exhaust cables in underground parking lots; main fire safety lifeline lines in the shafts of multi-story shopping malls.
• Large-Scale Municipal Public and Educational Projects: Fire pump and emergency elevator circuits in large-scale campus teaching buildings; fire-resistant distribution cables for enclosed conduit corridors in city center cultural venues; main cables for fire control equipment in large underground public parking lots.

• Transmission Distance and Load Matching Rules: NH-YJV 90℃ high-temperature resistant cross-linked polyethylene cable is suitable for long-distance emergency power transmission within 800 meters; when the laying distance exceeds 800 meters, the building's vertical height, total pipe length, and rated load parameters of the fire-fighting equipment must be submitted to our internal fire-resistant cable technical team for free voltage drop simulation calculation to avoid insufficient terminal voltage affecting the start-up of the fire pump. For small-load projects with a laying distance within 250 meters and no risk of high-temperature stacking, designers can compare the cost of the NH-VV solution based on the project budget.
• Composite Performance Level Matching Standard: Standard single-strand NH-YJV cable is selected for ordinary single-strand vertical shaft and small enclosed cable tray circuits; emergency circuits in densely stacked multi-layer cable trays, fully enclosed underground shopping malls, and large pipeline corridors are upgraded to NH-ZR-YJV composite fire-resistant and flame-retardant cable trays that comply with the mandatory provisions of local fire protection codes.
• Laying Environment Classification and Matching Rules: Standard NH-YJV is suitable for concealed pipes in ordinary dry indoor shafts and walls; reinforced moisture-proof modified type is suitable for large underground parking lots in environments with long-term condensation; low-temperature resistant type is suitable for outdoor fire emergency pipe laying in high-altitude areas of northern China.
• Mandatory Requirements for Fireproof Isolation Laying: When NH-YJV fire-fighting lifeline cables pass through building firewalls and floors, fire-resistant sealing material must be installed at the pipe openings to form a complete fireproof isolation system, preventing flames from penetrating through pipe gaps and damaging emergency circuits.

• Ambient Temperature Control Requirements: The construction ambient temperature for standard NH-YJV cable laying must not be lower than 0℃; in northern winters with low temperatures, a low-temperature resistant modified outer sheath model must be selected to prevent brittle cracking of the PVC outer sheath during long-distance vertical traction and bending operations.
• Bending radius limit standard: All bends, conduit runs, and fire control cabinet terminal connection operations must maintain a bending radius ≥ 12 times the cable outer diameter; forced sharp angle bends are prohibited to prevent the risk of internal double-layer mica tape entanglement separation and fire-resistant circuit opening hidden under flame impact.
• Requirements for heat dissipation and fire protection of parallel cable bundling: Sufficient heat dissipation gaps should be reserved between parallel NH-YJV fire-resistant cables in cable trays and shafts to avoid excessive density leading to heat accumulation and reduced actual current carrying capacity. Independent isolation baffles should be installed between fire-fighting lifeline cables and ordinary power distribution cables to block the cross-spread of flames in a fire.
• Protection measures for long-distance underground pipelines: For underground fire pump trunk lines passing under motor vehicle lanes, a reinforced concrete protective layer should be laid above the cable layer to withstand the long-term crushing load of vehicles. Sufficient cable length should be reserved at both ends of fire pump rooms and fire distribution cabinets for future cable terminal replacement and circuit fault repair.

• Before starting the acceptance work, verify the batch factory inspection certificate, the third-party NH 90-minute fire resistance test full-type test report, and the T2 oxygen-free copper raw material certificate.
• After cable laying and fire-resistant cable terminal manufacturing are completed, complete the insulation resistance test and power frequency withstand voltage test.
• Check the fire resistance test records of cable batches to ensure compliance with mandatory review requirements for fire safety supervision filing.
• Ensure that the cable core and sheath are reliably grounded according to emergency power distribution specifications, and test the grounding resistance to ensure compliance with the safety operation standards for the fire protection lifeline power grid in high-rise buildings.

Each delivery includes a complete set of officially certified materials stamped by the factory free of charge: National power industry authoritative full-type test report, GB/T 19666 NH type fire resistance special 90-minute survival test certificate, IEC certificate of conformity, CE certification documents, copper raw material certificate of origin, batch production inspection records, and NH-YJV dedicated vertical shaft and underground long pipeline fire-resistant lifeline laying guidance manual. These documents fully meet the requirements for high-rise building fire protection supervision filing, construction supervision review, fire protection acceptance of large public places, and overseas commercial building EPC customs clearance, avoiding delays in the construction cycle of large-scale super high-rise and commercial complex projects due to incomplete fire protection certification materials.

Our professional R&D team specializing in NH fire-resistant cross-linked polyethylene cables provides zero-cost, full-lifecycle consulting services: calculation of full-load current carrying capacity for high-rise fire-fighting equipment, simulation of voltage drop in long-distance emergency circuits over kilometers, recommendations for cable core count and cross-section matching, selection of single NH/NH-ZR composite performance grade, and optimized design of fire-resistant isolation laying schemes for densely bundled cables in vertical shafts. For large orders such as super high-rise residential buildings, large hospitals, and underground commercial complexes, professional engineers provide remote video on-site construction guidance, promptly helping construction teams solve technical challenges such as long-distance cable traction in vertical shafts, fireproof partition sealing, and fire protection acceptance.

We have established long-term, exclusive strategic supply partnerships with top-tier T2 oxygen-free copper smelters, high-purity double-layer fire-resistant mica tape manufacturers, and low-loss high-temperature cross-linked polyethylene raw material suppliers. This completely eliminates the possibility of products containing recycled copper or inferior single-layer thin mica tape that fail to meet fire resistance standards. Each batch of products undergoes 90-minute flame impact resistance and low-voltage electrical laboratory performance testing before shipment. Real-time online monitoring is conducted throughout the process to check the double-layer mica tape wrapping overlap rate, cross-linked polyethylene insulation extrusion thickness, and outer sheath uniformity, ensuring stable and reliable fire resistance and excellent high-temperature electrical performance of all cable reels. This effectively eliminates fire safety hazards in long-distance, densely laid cable installation projects in vertical shafts.

A dedicated intelligent automated production workshop for NH-YJV cross-linked polyethylene fire-resistant cables maintains ample inventory of mainstream multi-core universal specifications, enabling immediate shipment. For key EPC projects in high-rise residential buildings, large medical facilities, and underground commercial complexes, priority is given to the production of customized NH-ZR composite flame-retardant, reinforced moisture-proof, and low-temperature modified NH-YJV cables to fully meet the urgent construction schedule requirements of fire protection contractors.

Each cable reel is printed with a unique production batch number, production date, voltage rating, number of cores, and cross-sectional specifications, enabling full traceability from raw material supply to finished product delivery. Orders for large-scale high-rise residential buildings, hospitals, and underground commercial complex fire safety lifeline projects enjoy extended factory quality guarantees. If, during the warranty period, defects such as fire survival failure due to non-human-caused damage, mica layer delamination, high-temperature aging of XLPE insulation, or sheath damage caused by factory manufacturing processes occur, we will provide free replacement delivery and a complete cable replacement service to minimize the risk of large-scale power outages for fire protection equipment for the purchaser and long-term construction EPC project partners.

NH-YJV double-layer mica-wound fire-resistant XLPE low-voltage power cable is the preferred high-performance fire-resistant lifeline cable for core fire emergency circuits in ultra-high-rise residential buildings, large Class A hospitals, and underground integrated commercial buildings worldwide. It has received widespread recognition and recommendation from building electrical design institutes, fire supervision departments, and EPC general contractors for large-scale public buildings globally. Its unique double-layer inorganic mica tape with a 90-minute fire resistance barrier, a high-temperature resistant (90℃) high-current-carrying XLPE insulation layer, and long-distance low voltage drop performance enable this cable to adapt to various complex environments such as vertical shafts, long-distance buried pipelines, and densely bundled enclosed cable trays for fire-resistant lifeline installation. This effectively balances the initial investment in fire-resistant cables for building owners and general contractors with long-term maintenance costs for fire equipment circuits.

Our factory integrates independent R&D of fire-resistant cross-linked polyethylene cables, intelligent automated production lines, and a fully standardized low-voltage electrical high-temperature fire-resistant testing laboratory. We focus on providing stable, fully compliant, and cost-effective NH-YJV series fire-resistant cables to buyers of ultra-high-rise residential buildings, public medical facilities, underground commercial buildings, and large-scale municipal public infrastructure projects worldwide. We support long-term, stable, and bulk supply cooperation for various long-distance, high-temperature fire-resistant lifeline low-voltage power distribution projects.