Nyy-J 4 Core Copper Cable 70mm² 95mm² 120mm² 185mm² PVC Insulated for Power Distribution, Industrial Plants

The specification parameters of Nyy-J 4-core Copper Cables are the basis for their adaptation to different industrial power transmission scenarios. Each parameter has been carefully designed and rigorously tested to ensure stable operation in complex environments such as power distribution and industrial plants.

There is a rich range of wire gauge specifications, including 70mm², 95mm², 120mm², 185mm², etc. The conductor cross-sectional areas of different gauges vary significantly, which directly determines their current-carrying capacity and application scope. The conductor cross-sectional area of the 70mm² Cable is precisely controlled at 70±3.5mm², 95mm² is 95±4.75mm², 120mm² is 120±6mm², and 185mm² is 185±9.25mm².

Current-carrying capacity is a key indicator to measure the current transmission capacity of the cable, and it is significantly affected by the ambient temperature. In an environment of 90°C, the current-carrying capacity of the 185mm² cable can reach 420A, which can meet the high-current transmission requirements when connecting the main incoming line of large factories and large transformers; the 120mm² cable has a current-carrying capacity of 340A, suitable for medium-sized distribution trunks and power supply of high-power motor groups; the 95mm² cable has a current-carrying capacity of 280A, which can be used as the main cable of the workshop distribution box to distribute power to various production equipment; the 70mm² cable has a current-carrying capacity of 225A, suitable for dedicated power supply of small and medium-sized equipment and power transmission of branch lines. When the ambient temperature changes, the current-carrying capacity will also be adjusted accordingly. For example, at 70°C, the current-carrying capacity of the 185mm² cable will drop to about 380A, 120mm² is about 310A, 95mm² is about 255A, and 70mm² is about 205A. This requires that the cable specification should be reasonably selected according to the ambient temperature in practical applications.

The conductor is made of 99.9% pure electrolytic copper, stranded with multiple strands. The 70mm² cable is stranded with multiple strands of Copper Wire with a diameter of 0.4mm, with a total of 553 strands; 95mm² is stranded with 748 strands of copper wire with a diameter of 0.4mm; 120mm² is stranded with 940 strands of copper wire with a diameter of 0.4mm; 185mm² is stranded with 1452 strands of copper wire with a diameter of 0.4mm. The multi-strand stranded structure not only improves the Flexibility of the cable, making its minimum bending radius 6 times the outer diameter. The minimum bending radius of the 70mm² cable is about 36mm, 95mm² is about 42mm, 120mm² is about 48mm, and 185mm² is about 54mm, which is convenient for laying in narrow spaces and complex paths, but also enhances the mechanical strength of the conductor, enabling it to withstand a certain amount of tension and pressure.

In terms of the insulation layer, the thickness of the PVC Insulation layer coated on the outer layer of the conductor varies according to the wire gauge. The insulation layer thickness of the 70mm² cable is 1.4mm, 95mm² is 1.6mm, 120mm² is 1.8mm, and 185mm² is 2.0mm. The insulation layer can withstand a temperature of 90°C, and the insulation resistance is ≥100MΩ, which can effectively isolate the current and prevent electric leakage accidents.

The overall sheath is also made of PVC material, and its thickness increases with the wire gauge. The sheath thickness of 70mm² is 1.8mm, 95mm² is 2.0mm, 120mm² is 2.2mm, and 185mm² is 2.5mm. The sheath has a hardness of Shore D 75, with excellent impact and wear resistance, which can protect the internal conductor and insulation layer from external damage.

The outer diameter of the cable also varies due to different wire gauges. The outer diameter of the 70mm² cable is about 24mm, 95mm² is about 27mm, 120mm² is about 30mm, and 185mm² is about 34mm. This outer diameter design enables it to fit common cable pipes and trunking, facilitating installation and construction.

In addition, this series of cables also meets the requirements of the EN 50525 standard, and performs well in chemical corrosion resistance and ultraviolet aging resistance, and can operate stably for a long time in various harsh industrial environments.

Nyy-J 4-Core Copper cables, with their various specifications and excellent performance, have a wide range of distinctive applications in power distribution and industrial plants, and can meet the power transmission needs of different scenarios.

In the power distribution system, 185mm² and 120mm² cables play an important role as trunk lines. The 185mm² cable has a large current-carrying capacity of up to 420A, which is suitable for the main incoming line of the factory, introducing external high-voltage power into the internal power distribution system of the factory, and providing guarantee for the power supply of the entire factory. At the same time, it can also be used for connecting large transformers to ensure stable and reliable power transmission between the transformer and the power distribution system. The 120mm² cable has a current-carrying capacity of 340A, which is suitable for medium-sized distribution trunks. It distributes power from the main distribution room to each regional distribution room in the factory, and can also be used for power supply of high-power motor groups, such as power transmission for large industrial water pumps, fans and other equipment.

The 95mm² cable has a current-carrying capacity of 280A and can be used as the main cable of the workshop distribution box. In industrial plants, each production workshop is equipped with a distribution box. The 95mm² cable transmits power from the regional distribution room to the workshop distribution box, and then the distribution box distributes power to various production equipment in the workshop to ensure stable and orderly power supply in the workshop. In addition, it can also be used for dedicated power supply of some medium-sized equipment, such as medium-sized CNC machine tools, injection molding machines, etc.

The 70mm² cable has a current-carrying capacity of 225A, which is suitable for dedicated lines and branch lines of small and medium-sized equipment. In industrial production, small and medium-sized equipment such as small fans, water pumps, and conveyors can be powered by 70mm² cables. At the same time, in the branch lines of the power distribution system, 70mm² cables can distribute power from the main line to various small electrical equipment or sockets to meet scattered power needs.

In industrial plants, the application of Nyy-J 4-core copper cables is even more extensive. Assembly line motors are the core equipment of factory production, and their normal operation requires stable power supply. Cables with specifications such as 120mm² and 95mm² can provide reliable power transmission for them according to the motor power. Furnace equipment has high power and high temperature, and 185mm² cables can withstand its high current demand to ensure the normal operation of the furnace. Compressors are used for compressing air in industrial production, and 95mm² and 70mm² cables can supply power to them according to the compressor power to ensure their stable operation.

This series of cables can also adapt to various harsh industrial environments. In mechanical processing workshops with oil pollution, the PVC Sheath of the cable has oil resistance, which can prevent oil pollution from eroding the cable; near equipment with vibration, the multi-strand Stranded Conductor structure makes the cable have good flexibility and vibration resistance, and is not easy to be damaged due to vibration; in high-temperature environments, the temperature resistance of the cable can reach 90°C, and it can maintain stable performance at higher temperatures.

In addition, Nyy-J 4-core copper cables are also suitable for power wiring in new factories and line transformation in old factories. New factories can select appropriate specifications of cables according to power demand to build an efficient and stable power transmission system; during line transformation in old factories, this series of cables can be compatible with the original power distribution system, improving the safety and reliability of power transmission.

Nyy-J 4-core copper cables fully consider the needs of industrial power transmission in material selection and style design, taking into account performance, safety and practicality, enabling them to play an excellent role in complex industrial environments.

The Conductor Material is 99.9% pure electrolytic copper. This high-purity copper has extremely high conductivity, which can effectively reduce energy loss during current transmission and improve power transmission efficiency. High-purity copper also has good oxidation resistance and corrosion resistance, which can prolong the service life of the cable and ensure stable conductivity during long-term use. The multi-strand stranded structure design not only makes the cable have good flexibility, facilitating laying in narrow spaces and complex paths, but also enhances the mechanical strength of the conductor, enabling it to withstand a certain amount of tension and pressure and not easy to break.

The insulation layer is made of PVC (polyvinyl chloride) material, which has excellent insulation performance with an insulation resistance of ≥100MΩ, which can effectively isolate the current and prevent electric leakage accidents. The PVC insulation layer can withstand a temperature of 90°C, and can maintain stable insulation performance in higher ambient temperatures, adapting to possible temperature changes in industrial plants. At the same time, it also has good chemical corrosion resistance, which can resist the erosion of common acids, alkalis and other chemical substances in industrial environments and protect the conductor from damage. In addition, the PVC insulation layer also has a certain ability to resist ultraviolet aging, extending the service life of the cable in outdoor or ultraviolet-irradiated environments.

The overall sheath is also made of PVC material, and its thickness increases from 1.8mm for 70mm² to 2.5mm for 185mm² with the wire gauge. The sheath has a hardness of Shore D 75, with excellent impact and wear resistance, which can protect the internal conductor and insulation layer from mechanical damage such as collision and friction during cable laying and use. The PVC sheath also has good sealing performance, which can prevent moisture, dust and other impurities from entering the cable and affecting its performance.

In terms of style design, the cable has a 4-core structure, including 3 phase lines and 1 neutral line. This structure meets the needs of the three-phase four-wire system in industrial power transmission, facilitating the connection of three-phase equipment and single-phase equipment. The color identification of the cable is clear. The phase lines are brown, black and gray respectively, and the neutral line is blue. This color distinction can help electricians quickly identify the function of each core wire during installation and wiring, reduce the risk of wiring errors, and improve construction efficiency.

The appearance of the cable is round with a smooth surface. This design reduces the resistance during laying, facilitating pipe threading and wiring operations. At the same time, the smooth surface is also conducive to reducing the accumulation of dust and dirt, reducing maintenance costs. In addition, the overall structure of the cable is compact, occupying a small space, and can adapt to various complex installation environments.

The production process of Nyy-J 4-core copper cables is complex and rigorous. Every link from raw material selection to finished product inspection is strictly controlled to ensure that the product quality and performance meet relevant standards and usage requirements.

Conductor manufacturing is the first step in the production process. 99.9% pure electrolytic copper ingots are selected as raw materials and put into a furnace for high-temperature smelting. The temperature is controlled at about 1100°C to completely melt the copper ingots into copper water. During the smelting process, an appropriate amount of deoxidizer is added to remove oxygen and other impurities in the copper water and improve the purity of copper. The smelted copper water is cast into copper rods through a continuous caster, and the diameter of the copper rods is precisely controlled according to different wire gauges.

Subsequently, the copper rod enters a wire drawing machine for wire drawing. According to the required copper wire diameter for different wire gauges, the copper rod is drawn into fine copper wires with a diameter of 0.4mm through a series of dies with different apertures. During the wire drawing process, it is necessary to accurately control the wire drawing speed and die temperature to ensure that the diameter of the copper wire is uniform, the surface is smooth, and defects such as burrs and cracks are avoided. The drawn copper wire needs to be annealed. The copper wire is put into an annealing furnace, heated to 300-400°C under the protection of inert gas, and slowly cooled after being insulated for a period of time. Annealing can eliminate the internal stress of the copper wire, improve the flexibility and conductivity of the copper wire, and make the copper wire easier to strand.

Next is the conductor stranding process. According to the requirements of different wire gauges, multiple strands of fine copper wires are stranded according to the specified stranding direction and pitch to form 4 independent conductors (3 phase lines and 1 neutral line). The stranding process is carried out on a special stranding machine. It is necessary to ensure that each strand of copper wire is evenly stressed and tightly stranded, avoiding loose strands, broken strands, etc., to ensure the conductivity and mechanical strength of the conductor. The stranded conductor needs to undergo appearance and size inspection to ensure that it meets the design requirements.

Insulation layer extrusion is a key step to endow the conductor with insulation performance. Each stranded conductor is sent to an extruder separately, and a layer of PVC insulation is extruded outside the conductor. Before extrusion, PVC raw materials need to undergo strict screening and drying treatment to remove impurities and moisture to ensure the quality of the insulation layer. The temperature control of the extruder is crucial. The barrel temperature is generally set at 160-180°C to fully melt and plasticize the PVC material. The molten PVC material is evenly coated on the surface of the conductor through a die to form an insulation layer with uniform thickness. The thickness of the insulation layer varies according to the wire gauge (1.4mm for 70mm², 1.6mm for 95mm², 1.8mm for 120mm², and 2.0mm for 185mm²). The extruded Insulated Wire core is quickly cooled through a cooling water tank to shape the PVC insulation layer.

After the insulated wire core is cooled, color identification is required. Different colors are extruded on the surface of the insulation layer through special color masterbatches. The phase lines are brown, black and gray respectively, and the neutral line is blue. The color should be uniform, clear and not easy to fall off, which is convenient for identification.

Then is the cabling process. The 4 wire cores with insulation layer and color identification are cabled according to a certain stranding method to form a 4-Core Cable. During the cabling process, it is necessary to ensure that each wire core is arranged neatly and stranded tightly. At the same time, appropriate filling materials are filled in the stranding gap to make the cross-section of the cable round and improve the structural stability of the cable. After cabling, a layer of non-woven fabric is wrapped around the cable to play an isolation and protection role.

Next is the sheath extrusion process. The cabled cable is sent to the sheath extruder, and a layer of PVC sheath is extruded outside it. The process of sheath extrusion is similar to that of the insulation layer. The PVC raw materials also need to be processed, and the extrusion temperature is controlled at 170-190°C. The molten PVC material is evenly coated on the outer layer of the cable through a die to form a sheath with uniform thickness. The thickness of the sheath increases with the wire gauge (1.8mm for 70mm², 2.0mm for 95mm², 2.2mm for 120mm², and 2.5mm for 185mm²). The extruded cable is cooled through a cooling water tank to shape the sheath.

After the sheath is cooled, the cable is printed. The product specifications, model, rated voltage, implementation standard, production batch number and other information are printed on the surface of the sheath by a printing machine. The printing should be clear and firm, facilitating product identification and traceability.

Finally, the cable undergoes a series of strict quality inspections, including conductor DC resistance test, insulation resistance test, voltage withstand test, mechanical performance test, etc. The conductor DC resistance test ensures that its conductivity meets the standard; the insulation resistance test and voltage withstand test verify the insulation performance of the insulation layer and sheath to prevent electric leakage accidents; the mechanical performance test checks the tensile strength, elongation at break and other indicators of the cable to ensure that it has sufficient mechanical strength. Qualified cables are cut and wound according to the specified length (usually 100 meters, 200 meters or 500 meters), and then packaged.

The packaging design of Nyy-J 4-core copper cables fully considers product protection, transportation, storage and customer convenience, ensuring that the products remain intact during circulation and maintain good condition.

For long-length cables (100m, 200m, 500m), cable reel packaging is usually adopted. Cable reels are made of high-strength wooden or steel materials, with sufficient compressive and impact resistance to bear the weight of the cable and external impacts during transportation. The diameter of the cable reel depends on the length and gauge of the cable. For 70mm² and 95mm² cables, the diameter is generally 800-1000mm; for 120mm² and 185mm² cables, it is 1000-1200mm. This ensures that the cable can be neatly wound without looseness, distortion, or mutual friction.

After the cable is wound onto the reel, a moisture-proof film is wrapped around its surface to prevent moisture damage during storage and transportation, which could affect insulation performance. Both sides of the reel are fitted with baffles printed with clear product information: name, specification, length, rated voltage, execution standard, batch number, manufacturer’s name, and contact details. This facilitates quick identification and verification during customer receipt and inspection.

Short-length cables (10m, 20m, 50m) are packaged in sturdy wooden crates or on pallets. Wooden crates use high-quality boards with moisture-proof paper lining; cables are placed neatly and sealed to resist dust, debris, and impacts. Pallet packaging secures cables to pallets with stretch film for easy forklift handling. All packaging includes detailed product information for convenient access and management.

For export, packaging complies with international shipping standards: fumigated wooden reels/crates prevent pest transmission; clear English labels and universal shipping marks (e.g., moisture resistance, upright orientation, stacking limits) ensure safe transit.

Packaging processes strictly follow specifications to secure cables. Reels are tension-controlled during winding, with ends fixed by ropes or steel straps to prevent shifting. Small packages are rationally packed to avoid over-compression.

Nyy-J 4-core copper cables are transported in strict accordance with regulations to ensure safe, intact, and timely delivery.

Domestic transportation options include road and rail, chosen by distance, quantity, and customer needs. Road transport offers flexibility for short to medium distances, using enclosed vans or semi-trailers to shield cables from sunlight, rain, and dust. Loading involves 整齐排列 reels or packages, secured with ropes/straps. Heavy reels are handled by forklifts to prevent displacement, collisions, or falls during transit.

Rail transport suits long-distance, large-volume shipments, with advantages of high capacity, low cost, and stability. Cables are loaded into containers or covered railcars, secured to avoid compression and collisions. Real-time tracking via railway systems monitors location and estimated arrival, aiding customer preparation.

For exports, sea and air freight are primary options. Sea freight is cost-effective for large quantities and long distances but slower. Cables are packed in reinforced reels with moisture-proofing to resist seawater and humidity; reels are fixed inside containers to prevent damage from vessel movement.

Air freight is used for urgent or small-volume orders, ensuring speed at higher cost. It adheres to airline regulations on packaging, weight, and dimensions. Packages are reinforced to withstand pressure changes and vibrations during flight. Documentation (invoices, packing lists, certificates) is prepared to ensure smooth customs clearance.

Regardless of mode, extreme temperatures, humidity, and mechanical impacts are avoided. Insulation and sheath materials may soften in high heat or become brittle in cold, so shipments are timed to avoid extreme weather or equipped with temperature-control measures. Sharp objects are excluded from cargo to prevent sheath/insulation damage.

Reputable logistics partners are selected, with detailed contracts clarifying liability for loss or damage. Customers receive shipment notifications with logistics details (carrier, tracking number, ETA) for monitoring. Upon delivery, customers inspect for damage; any issues are promptly addressed with the logistics provider and manufacturer.

The shipment process for Nyy-J 4-core copper cables is streamlined to ensure accurate, timely delivery, covering order verification to post-delivery follow-up.

Upon order receipt, the sales team verifies details: specification, quantity, delivery address, timeline, and packaging requirements. This prevents errors like incorrect gauges or quantities. Validated orders enter the system, triggering notifications to warehouse and production departments.

Warehouses check inventory for in-stock items. Picked cables undergo strict inspections: conductor continuity, insulation layer integrity (no cracks/abrasions), sheath smoothness, and clear printing. For 70mm²-185mm² cables, diameter and length are measured to meet standards.

If stock is insufficient, production schedules are adjusted based on order priority. The production department accelerates manufacturing while maintaining quality checks—e.g., conductor resistance testing and insulation withstand voltage tests—to meet deadlines.

After inspection, cables are packaged as specified: long lengths on reels with moisture-proof film and labels; short lengths in crates/pallets with protective padding. Each package is labeled with product info and batch numbers for traceability.

Warehouses coordinate with logistics for pickup, providing handling instructions (e.g., "Do not stack over 3 layers" for reel packages). A comprehensive shipment record is maintained, including product details, quantity, waybill numbers, and departure time, stored electronically for 5+ years per quality management requirements.

Customers receive shipment alerts via email/SMS with tracking links. The sales team follows up during transit, addressing delays or damage promptly. Post-delivery, a confirmation call ensures satisfaction, with feedback recorded to improve processes.

Providing samples of Nyy-J 4-core copper cables is a key service to help customers verify quality and suitability before bulk orders.

Sample requests are processed within 24 hours of inquiry. Standard samples (1-2 meters) are cut from production batches to ensure representativeness, including all components: 4 Conductors, insulation layers, and sheath. Each sample is labeled with specification, batch number, and production date.

Samples undergo the same quality checks as bulk products: conductor purity verification (via spectroscopy), insulation resistance testing (≥100MΩ at 500V DC), and sheath hardness measurement (Shore D 75±2). Test reports from accredited labs (e.g., ISO 17025-certified) are provided upon request, covering parameters like DC resistance (≤0.268Ω/km for 70mm² at 20°C) and voltage withstand (3kV for 5 minutes without breakdown).

Packaging for samples uses durable cardboard boxes with foam padding to prevent bending or crushing during transit. A product brochure and test report copy are included for reference.

Samples are shipped via express services (DHL, FedEx) for 3-5 day delivery, with tracking provided. The technical team follows up to assist with evaluation—e.g., explaining Insulation Material advantages or conducting on-site tests if needed—helping customers make informed decisions.

For custom sample requests (e.g., specific lengths or color-coded sheaths), the R&D department collaborates with production to fulfill requirements within 5-7 days, supporting unique project needs.

Comprehensive after-sales service ensures customer satisfaction and addresses issues with Nyy-J 4-core copper cables, fostering long-term partnerships.

A dedicated after-sales team responds to inquiries within 2 hours for urgent cases (e.g., power failure due to suspected cable issues) and 24 hours for general queries. Contact channels include phone, email, and an online portal with ticket tracking.

For quality complaints—such as insulation breakdown or conductor oxidation—the team initiates an investigation within 48 hours: reviewing production records, shipment photos, and customer usage conditions (e.g., ambient temperature, chemical exposure). If manufacturing defects are confirmed (e.g., substandard insulation material), replacements or refunds are offered per the warranty policy.

The warranty period is 24 months from delivery, covering material and workmanship defects. It excludes damage from improper installation (e.g., exceeding bending radius) or external factors (e.g., rodent bites). A "Warranty Extension Program" offers up to 5 years of coverage for an additional fee, including annual maintenance checks.

Technical support includes on-site guidance for installation—e.g., proper termination methods using crimp connectors—and system design advice (e.g., selecting 185mm² for 400A loads). The team provides installation manuals in multiple languages, with diagrams for reel unwinding and cable routing.

Feedback collection mechanisms include post-purchase surveys and annual customer visits. Common feedback—such as requests for more durable labels—is integrated into product improvements. For example, after customer reports of label fading in high humidity, a UV-resistant printing process was adopted.

Training sessions are offered for customer maintenance teams, covering cable inspection (visual checks for sheath cracks), troubleshooting (using megohmmeters for insulation testing), and safety protocols. These sessions are available in-person or via webinars, with certification provided upon completion.

In summary, Nyy-J 4-core copper cables combine robust specifications, versatile applications, and reliable support—from production to after-sales—making them a trusted choice for power distribution and industrial plant needs.