Wires and Cables
UL standard
THHN AND THWN
Electrical wire THHN THWN is used in new construction projects or rewiring tasks in 600-volt systems. Versatile and usable in both wet and dry locations, THHN/THWN-2 is an excellent choice for a wide range of electrical installations. THHN/THWN-2 conductors can withstand temperatures up to 90°C in dry environments and up to 75°C in the presence of oil or coolant. Its outer nylon jacket is smooth and fine, ensuring easy installation by reducing friction during pulling. This feature is especially useful for long or challenging runs.In-Depth Analysis
NPC Electric building wire are built to deliver high efficiency, reliable performance, and advanced safety, helping businesses reduce energy costs while ensuring stable power supply. With future-ready adaptability for renewable energy and smart grid applications, they provide a sustainable and innovative solution for today’s and tomorrow’s power needs.
Comparative Analysis of Efficiency and Loss
Compared to the industry average, NPC control & instrument cable exhibit lower losses and higher efficiency across the entire load range.
Load Efficiency Comparison(%)
No-load Loss Comparison(W)
High Conductivity Design
High-purity oxygen-free copper or high-quality aluminum conductors are used with smooth surface and low resistance to ensure efficient power transmission and reduce energy loss.
Improved Conductivity
+20%
Reduced Energy Loss
-15%
Insulation Protection System
Use flame-retardant, wear-resistant and corrosion-resistant polymer insulation materials to meet the safe operation requirements in different environments.
Withstand Voltage Level
≥1kV
Flame Retardant Grade
VW-1 / IEC 60332-3
Weather-Resistant & Durable Technology
The outer sheath is made of UV-resistant, heat-resistant, and oil-resistant materials, making it suitable for high and low temperatures, humidity, and long-term outdoor use.
Service Life
≥ 25 Years
Operating Temperature Range
-40°C to +90°C
Safe Flame Retardant System
The multi-layered flame-retardant structure effectively slows the spread of flames and releases low-smoke, halogen-free gases during combustion, reducing secondary hazards.
Flame Retardant Performance
IEC 60332 / UL 1581 Qualified
Smoke Density
Low Smoke ≤50%
Easy Installation & Maintenance
The flexible core and flex-resistant outer sheath provide a small bend radius and high installation efficiency. Color coding and length markings reduce installation and maintenance costs.
Bend Radius
≤6D
Installation Efficiency Improvement
+30%
Intelligent Monitoring
An optional remote monitoring system is available to monitor operating status, temperature, load and other parameters in real time, and supports fault warning and remote diagnosis.
Data Collection Frequency
one times a minute
Fault Warning Accuracy
98%
Environmental Adaptability Analysis
NPC building wire have been rigorously tested and can operate stably under various harsh environmental conditions.
Temperature Range
-40℃ ~ +55℃
Can work normally in extreme high and low temperature environments
Humidity Adaptation
0 ~ 100% RH
Including condensation environment, no frost requirement
Weather Resistance Grade
UV/IEC 60811-501
The outer sheath has excellent UV resistance and aging resistance
Chemical Corrosion Resistance
Oil / Acid / Alkali
Resistant to oil, acid, alkali and some chemical corrosion environments
Why Choose Us
With 30 years of expertise, global certifications, and advanced manufacturing technology, NPC Electric delivers reliable, high-performance building wire trusted by industries worldwide.
Building Wire Manufacturer
As a leading building wire manufacturer, NPC Electric specializes in providing high-quality building wire solutions for both residential and commercial wiring. Our building wires are crafted from premium copper or aluminum conductors, ensuring superior electrical conductivity and reliable performance. Designed for power distribution, lighting circuits, and control systems, our wires meet the highest safety standards, including UL and IEC certifications. Whether for new construction or remodeling projects, our building wire offers flexibility, durability, and safety in a wide range of applications. With competitive pricing and industry compliance, NPC Electric ensures you receive cost-effective, high-performance wiring solutions for any electrical project.
Building Wire Durability & Safety
Our building wire is designed to provide exceptional durability and safety for all electrical installations. With advanced fire-resistant insulation, our wires offer superior protection against fire hazards, ensuring safe electrical systems in residential and commercial buildings. The abrasion-resistant outer layer ensures that the wire maintains its integrity, even in harsh conditions or areas with high wear and tear. Whether used in indoor wiring or outdoor circuits, our high-performance building wire is built to withstand moisture, chemical exposure, and extreme temperatures, making it the ideal choice for long-lasting and reliable wiring solutions. Flexible and durable, it meets all safety standards, ensuring compliance with UL and IEC certifications for peace of mind and maximum reliability in every installation.
Building Wire Conductivity & Performance
Our building wire is engineered for exceptional conductivity and high electrical performance, ensuring efficient power transmission across residential and commercial installations. Manufactured with premium copper or aluminum conductors, our wires provide superior electrical conductivity, minimizing energy loss and enhancing overall system efficiency. Designed for both lightning circuits and power distribution systems, our high-performance building wire delivers consistent and reliable electrical performance. Whether you choose copper for higher conductivity or aluminum for a lighter and cost-effective solution, our wires meet the highest industry standards, ensuring safe and efficient wiring solutions. Built for long-term durability, our building wires offer unmatched performance, keeping your electrical systems running smoothly for years.
Testing & Quality Control
At NPC Electric, testing and quality control are critical to ensuring the highest standards of building wire performance and safety. Our electrical cable testing procedures include voltage testing, insulation resistance tests, and mechanical stress testing to ensure every wire meets safety regulations and performs reliably under demanding conditions. We use advanced testing methods to evaluate conductivity, flexibility, and abrasion resistance, guaranteeing high-performance wire that meets or exceeds UL and IEC standards. Our strict quality assurance process ensures that every building wire is thoroughly tested for durability, electrical efficiency, and safety. With quality control procedures in place, we ensure each product delivers reliable, long-lasting performance, making NPC Electric the trusted choice for premium wiring solutions in residential, commercial, and industrial applications.
Product Show
Explore the detailed design and practical application scenarios of building wire
Red Building Wires
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Building Wires Types
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Building Wires Construction Site
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Building Wire Warehouse
building wire warehouse products
Testing and Certification
Tested with precision and certified to meet international standards as
well as strict industry requirements.
Bare Cable Test Report
SGS Inspection Report
Certificate of Acceptance
ISO Quality Certificate
ISO Environmental Certificate
ISO Occupational Certificate
UL Laboratory Certificate
UL Product Certificate
Project Cases
NPC building wire has been successfully applied in many projects and has been highly praised by customers.
Peru Solar PV Project
CompletedNPC Electric Delivers Medium-Voltage Cables for Peru Solar PV Project
Country：Peru
Model：HEPRZ1(AS) 1x630 mm² 19/33kV x 6km
Chile El Project
CompletedReliable 19/33kV MV cables ensuring safe, stable, and efficient power transmission for critical projects.
Country：Chile
Model：19/33kV MV Power Cables x 5km
Dominican Edenorte Project
CompletedProvide outdoor power solutions for urban main road reconstruction projects to adapt to complex environments.
Country：Dominican
Model：NPC AAAC Cable & Triplex Cable x 10km
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
FAQ From Customers
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What is UL standard building wire?
UL standard building wire refers to electrical wiring that meets the safety and performance standards set by Underwriters Laboratories (UL). UL is a global safety certification organization that tests and certifies electrical products to ensure they meet safety, fire resistance, and electrical conductivity requirements. UL standard building wire is designed for use in residential, commercial, and industrial electrical systems, ensuring safe and reliable operation in a wide range of environments. -
Why is UL certification important for building wire?
UL certification ensures that building wire meets rigorous safety standards, protecting both the electrical system and users. UL-certified wires are tested for fire resistance, electrical performance, and mechanical durability to ensure they can withstand harsh conditions. Using UL standard building wire helps meet national electrical codes and ensures that installations are compliant with safety regulations, reducing the risk of electrical hazards, such as short circuits, overheating, and fires. -
What are the advantages of using UL standard building wire?
The advantages of using UL standard building wire include enhanced safety, reliability, and performance. UL-certified wires undergo thorough testing for electrical conductivity, flame resistance, and durability. They are designed to provide optimal power transmission while ensuring fire safety and reducing the risk of electrical faults. UL standard wire offers peace of mind, knowing that the wire has been tested to the highest safety standards and is suitable for both residential and industrial applications. -
What types of building wire meet UL standards?
UL standard building wire comes in a variety of types depending on voltage rating, application, and environment. Common types include:
1. Low Voltage Building Wire (up to 600V), typically used in residential and commercial wiring.
2. Medium Voltage Wire (600V to 15kV) used in industrial or power distribution systems.
3. Fire-Resistant Cables designed for use in high-risk environments.
4. Flexible and Armored Cables for dynamic applications that require protection against physical damage.
All of these wires meet UL 83, UL 1063, and other UL standards, ensuring compliance and reliability in various electrical systems. -
How does UL standard building wire differ from non-UL certified wire?
UL standard building wire is tested and certified to meet strict safety standards, ensuring reliable electrical performance and compliance with national electrical codes. Non-UL certified wire may not have undergone the same rigorous testing and could pose higher risks of electrical failure, overheating, or fire hazards. UL-certified wire is also traceable, ensuring it has been manufactured to meet the required specifications, offering greater assurance of safety and durability for both residential and commercial electrical installations.
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