Solid Copper Core Fire Survival Fixed Wiring Cable for Emergency Load & Fire-code Compliant Construction Projects
Ürün Özetleri
Ürün Açıklaması
NH-VV is a fire-resistant low-voltage power cable with a rated voltage of 0.6/1kV. It consists of a solid, tightly packed copper conductor, a fire-resistant special PVC insulation layer, environmentally friendly filler materials, and an integrated PVC outer sheath. NH represents its fire-resistant properties, ensuring continuous power supply for a certain period even in open flame environments. Unlike the flame-retardant ZR-VV cable, which only suppresses flame spread, NH-VV is specifically designed for critical fire-fighting power circuits and emergency backup power circuits, providing continuous power supply during building fire hazards. NH-VV cables are widely designated by architectural design institutes as mandatory wiring materials for fire protection engineering and are one of the mainstream fixed-layout low-voltage cables in the global building procurement market for commercial complexes, hospitals, rail transit, and industrial fire protection systems.
The main standard configuration uses Class 1 solid round copper conductors. Class 2 tightly stranded copper conductors can be customized according to customer needs. The raw material copper purity is ≥99.97% electrolytic copper, conforming to IEC60228 standards. Tight processing reduces the conductor's DC resistance, thereby reducing long-term operating energy consumption. Core configurations include single-core, double-core, triple-core, quad-core, five-core, and 3+1-core, 3+2-core multi-core structures; cross-sectional area ranges from 1.5mm² to 240mm², with a complete range of specifications. Extra-large cross-sectional areas (up to 300mm²) can be customized to meet the needs of special high-current engineering projects. The resistance data of all finished conductors are strictly controlled within the upper limit range specified by GB/T and IEC standards.
The insulation layer uses modified fire-resistant PVC compound. An inorganic fire-resistant inner barrier layer surrounds the conductor. This composite structure can maintain insulation integrity under specified flame combustion conditions. Environmentally friendly, non-hygroscopic filler material is used to fill the gaps between the cable cores to maintain the rounded appearance of the cable, reduce the internal gaps of the finished cable, and improve the overall structural stability of the multi-core finished cable.
The outer sheath is made of weather-resistant rigid PVC composite material, suitable for operating temperatures from -30℃ to +70℃, and has excellent anti-aging and moisture-proof properties;
The core differentiating advantage of NH-VV cables compared to traditional cables is that, under standard fire resistance test conditions, depending on the NH rating, the cable can maintain intact insulation and continuously supply power for 90 minutes or 180 minutes. This ensures the normal operation of fire pumps, smoke exhaust fans, emergency lighting, and fire alarm equipment in the event of a building fire, meeting the mandatory design requirements of national fire protection codes for critical load circuits.
The integrated enclosed outer sheath and compact internal filling structure effectively prevent moisture, condensation, and humid air from penetrating the inner core; suitable for high-humidity environments such as damp basements, underground cable trenches, and semi-buried conduits, avoiding short-circuit faults caused by moisture degradation of the internal insulation layer during long-term use.
The integrated circular multi-core molding technology improves the cable's overall compressive strength and extrusion resistance, especially during conduit wiring and concealed wall installation; the solid copper conductor is less prone to core breakage even under moderate tensile force during construction and wiring, effectively reducing construction waste on-site.
The modified PVC insulation and sheathing materials contain UV-resistant and antioxidant additives, which slow down the aging process under long-term indoor and outdoor temperature variations. Under standard installation conditions, the design service life can reach over 30 years, thus reducing the owner's investment in later circuit maintenance and cable replacement.
The main circuits for emergency lighting, fire elevator power supply, fire hydrant pumps, and smoke exhaust equipment in high-rise residential buildings, large comprehensive hospitals, shopping malls, and municipal stadiums are all subject to fire safety regulations requiring all fire load circuits to use fire-resistant cables. This makes it the most concentrated area for NH-VV cable procurement.
Emergency power supply circuits in substations, fire control circuits in underground pedestrian passages, and dedicated fire distribution circuits in subway stations; enclosed underground spaces have strict fire safety management regulations, and the NH-VV fire resistance rating is prioritized for inclusion in design specifications by municipal design institutes.
Wiring for fire alarm systems in chemical workshops, emergency backup generator wiring in factories, and emergency power circuits for flammable raw material warehouses; high-fire-risk industrial zones require critical safety circuits to use fully fire-resistant wiring to meet factory safety inspection standards.
Fire-resistant power circuits for centralized energy storage power stations, and emergency shutdown control cables for distributed photovoltaic projects; the new energy industry implements strict fire protection regulations, and NH-VV cables are widely used in auxiliary power distribution wiring related to internal safety of power stations.
Emergency evacuation lighting cables for school dormitories; fire control wiring for government office buildings; most government-invested public construction projects use centralized bidding for NH-VV series cables.
Rating Selection Principles: NH-A grade is recommended for fire protection circuits in super high-rise buildings, underground enclosed tunnels, and large medical cores; NH-B grade is suitable for fire protection circuits in ordinary multi-story commercial buildings and ordinary industrial plants. Our technical team can provide free fire rating matching advice based on local building fire protection standards.
Laying Requirements: When concealed within walls or pre-embedded in PVC conduits, control cable tension to avoid scratching the outer sheath; the minimum bending radius of finished NH-VV cables should not be less than 10 times the cable's outer diameter to prevent cracking of the inner insulation layer.
High-Density Cable Shaft Laying: Reserve appropriate heat dissipation gaps between cable bundles to avoid overheating and accelerated insulation aging; we provide complete current carrying capacity parameter tables for different laying methods for engineers to perform load calculations and cable gauge selection.
Strictly confirm the core wire structure and cross-section according to the construction drawings, distinguishing between fire emergency circuits and general lighting circuits. Avoid purchasing excessively high-specification NH-A grade cables for non-fire emergency circuits, thereby saving unnecessary procurement costs.
For projects with phased construction and batch delivery requirements, our factory supports batch delivery according to the project construction progress, reducing the purchaser's large-volume on-site warehousing costs and capital occupation.
For projects in coastal high-salt spray or special chemically corrosive environments, specify customized anti-corrosion sheath requirements before order confirmation to improve the environmental adaptability of the finished cables.
- Compared to ordinary non-fire-resistant VV cables: NH-VV cables maintain complete power transmission capability throughout the specified fire duration, meeting mandatory acceptance standards of fire protection codes; ordinary VV cables rapidly lose insulation in a fire and fail fire safety inspections during final acceptance.
- Compared to ZR-VV flame-retardant cables: ZR-VV cables can only suppress the continued spread of flames but cannot maintain normal power supply under combustion conditions; NH-VV cables provide fire-resistant power supply, are the legally designated option for critical fire loads, and are irreplaceable in compliant fire circuits.
- Compared to imported brand fire-resistant cables: Our products adhere to the same international fire-resistant testing standards, have shorter delivery cycles, and offer more flexible small-batch customization services, resulting in a more advantageous overall procurement cost under the same technical specifications.
All NH-VV finished products have passed the national mandatory CCC certification and have full-type test reports issued by a national authoritative cable testing institution; all specifications are provided with third-party fire resistance performance test certificates and IEC standard inspection documents. The products comply with domestic engineering bidding and certification requirements as well as engineering certification requirements in Southeast Asia and the Middle East; the complete set of certification documents can be compiled into a formal bidding document package, helping the purchaser to successfully pass the project bidding qualification review and construction acceptance.
In 2025, a local EPC contractor purchased 36 kilometers of mixed-specification NH-VV 0.6/1kV (3x10mm²~5x25mm²) NH-A grade fire-resistant cables for the renovation of hospital fire pumps and emergency lighting. The project had stringent fire protection regulations for local medical buildings. Our cables passed the local third-party fire protection inspection on the first attempt, and the project was completed and accepted on schedule. The buyer subsequently signed an annual framework procurement contract.
In 2024, a municipal rail transit procurement department purchased 52 kilometers of NH-B grade NH-VV multi-core cables for the fire alarm and smoke exhaust power supply lines of a newly built subway station. The high-temperature and humid laying environment of the underground tunnel placed high demands on the cable's moisture-proof and fire-resistant performance. The finished product passed random on-site sampling inspection, and all indicators were qualified.
A professional team of electrical engineers provides free consultation on specification selection, current carrying capacity verification, and assistance in preparing bidding technical parameters; we offer editable official data sheets, scanned certification documents, and test reports to expedite the preparation of design drawings and bidding documents. We can customize non-standard cross-section or special environment-modified sheathing products according to unique engineering needs.
Direct factory supply eliminates middlemen markups; tiered pricing is available for large orders; stable inventory of copper and plastic raw materials helps long-term contract clients mitigate the risk of raw material market price fluctuations. A portion of finished products of commonly used mainstream specifications is kept in stock, shortening delivery cycles for urgent orders.
