Triplex 1kv 3X1X50 mm2 Cables Nyy

Conductor Structure: The 50mm² conductor is stranded by 37 high-purity Copper Wires with a diameter of 0.41mm, with an overall outer diameter of about 8.6mm. The stranding pitch is 16 times the conductor diameter (approximately 138mm), which not only ensures the Flexibility of the cable (minimum bending radius is 12 times the cable outer diameter) but also reduces the skin effect through the layered stranding process, making the high-frequency current distribution more uniform.

Insulation Layer Parameters: The insulation layer is made of temperature-resistant PVC material with a thickness of 1.2mm. Tests show that its insulation strength reaches 20kV/mm (no breakdown under 3kV power frequency withstand voltage for 5 minutes). The volume resistivity of the insulation layer is ≥1×10¹⁴Ω·cm (at 20°C), ensuring no leakage current hazards, and it can work stably within the temperature range of -15°C to 70°C.

Overall Dimensions: The three-core conductors are arranged in an equilateral triangle, and the gaps are filled with 3mm diameter polypropylene ropes to ensure the roundness of the cabled cable (ellipticity ≤5%). The outer layer is wrapped with 0.1mm thick non-woven tape for fixation, with an overall outer diameter of about 30mm. For pipe laying, the recommended pipe diameter is ≥38mm (the inner diameter of the pipe is 1.25 times the outer diameter of the cable) to ensure good heat dissipation.

Weight and Tensile Strength: The weight per meter is approximately 1.1kg, and the tensile strength of the conductor is ≥200MPa, which can bear the tensile force generated by its own weight, making it suitable for suspended laying such as in shafts and cable trays.

When the ambient temperature rises to 40°C (such as in summer industrial workshops), the current-carrying capacity needs to be multiplied by a correction coefficient of 0.82, and the actual current-carrying capacity drops to 123A;

For underground laying, if the soil thermal resistance coefficient is 1.2K·m/W, the current-carrying capacity is corrected to 135A;

When multiple cables are laid in a common pipe, 3 cables need to be multiplied by a coefficient of 0.8 to avoid overheating due to poor heat dissipation.

Power Main Lines in Small and Medium-sized Workshops: In scenarios such as mechanical processing workshops and food processing plants, the cable is often used to connect the workshop main distribution box and the production line junction box, providing power for 3 sets of 15kW CNC machine tools or 2 sets of 22kW air compressors. Its oil resistance (insulation resistance retention rate ≥90% after 72 hours of immersion in engine oil) can adapt to the oily environment of the workshop, and the insulation layer is not easy to crack during frequent bending.

Power Supply for Logistics and Warehousing Equipment: The Power Lines of equipment such as stackers and conveyors in large warehouses often use this cable. Its flexibility can adapt to the movement trajectory of the equipment (bending radius ≥360mm), and its flame retardant performance (UL94 V-0 grade) can reduce the fire risk in the warehouse. In the simulated short-circuit test, the insulation layer shrinks without dripping when exposed to fire and self-extinguishes within 3 seconds after leaving the fire.

Power Distribution Trunk Lines in Commercial Complexes: In the low-voltage power distribution systems of shopping malls and hotels, the cable is led from the low-voltage side of the transformer (400V) to the floor main distribution box, supplying power to kitchen equipment in the catering area and water chillers in the air-conditioning room. Its moderate overall outer diameter (30mm) allows flexible laying in the cable tray in the ceiling, and the moisture resistance of the insulation layer (insulation resistance ≥100MΩ·km at 90% relative humidity) can adapt to the air-conditioning condensation environment.

Auxiliary Power Supply for Data Centers: Precision air conditioners and UPS backup power lines in data centers often use this cable. Its stable current-carrying capacity can ensure 24-hour uninterrupted operation of the equipment, and the low-smoke characteristic of the insulation layer (smoke density rating ≤50) can reduce the release of toxic gases in case of fire.

Emergency Power Supply for High-rise Residential Buildings: As a dedicated fire-fighting line in high-rise residential buildings, it connects emergency generators with fire pumps, elevators, and other equipment, providing emergency power below 75kW in case of power outages. When laid in pipes underground, the soil corrosion resistance of the insulation layer (no aging after 1000 hours of soil immersion test) can ensure a service life of more than 15 years.

Public Facilities in Large Communities: The power lines of sewage treatment equipment and central heating boilers in communities often use this cable. Its UV resistance (elongation at break retention rate ≥80% after 1000 hours of xenon lamp aging test) can adapt to outdoor laying needs.

Continuous casting and rolling of copper rods: Φ8mm copper rods are annealed at 800°C to reduce hardness (Vickers hardness HV ≤80) and improve plasticity;

Multi-head wire drawing: The copper rod is drawn into 0.41mm fine copper wires through 10 wire drawing dies, with the diameter deviation controlled within ±0.005mm to ensure uniform conductor resistance;

Bunch stranding: 37 copper wires are stranded in layers by a concentric bunch strander, and the direction of the outer copper wires is opposite to that of the inner layer to prevent loosening during laying, with the stranding tension stably maintained at 30N±2N.

Polyvinyl chloride resin (65%): Ensures insulation performance;

Diisononyl phthalate (DINP, 20%): Improves flexibility, keeping the insulation layer from becoming brittle at -15°C;

Calcium-zinc stabilizer (3%): Replaces traditional lead salts, complying with RoHS environmental standards;

Magnesium hydroxide flame retardant (12%): Endows the insulation layer with self-extinguishing characteristics after leaving the fire.

Cabling stage: 3 Insulated Conductors are arranged in an equilateral triangle, and the gaps are filled with polypropylene ropes (density 0.91g/cm³, water absorption ≤0.5%) to ensure that the roundness error after cabling is ≤1mm;

Wrapping and fixing: 0.1mm thick non-woven tape is spirally wrapped (with an overlap rate of 50%) to enhance structural stability and prevent conductors from shifting during laying;

Appearance inspection: After cabling, an online visual inspection system is used to automatically identify defects such as scratches (depth ≤0.2mm is acceptable) and bulges on the surface of the insulation layer, and unqualified products are automatically marked and rejected.

Electrolytic copper must be tested by a spectrum analyzer, with the total content of impurities (iron, nickel, lead, etc.) ≤0.005% and conductivity ≥101% IACS;

PVC particles are tested for melt index (1.8-2.2g/10min under 190°C/2.16kg conditions) and thermal aging performance (tensile strength loss rate ≤20% after 100°C×168 hours);

Filling ropes and non-woven tapes are tested for temperature resistance (≥100°C) and tensile strength (≥150MPa).

Conductor stranding: A servo motor is used to control the stranding tension (30N), and the pitch is monitored in real-time (deviation ≤±2%) to ensure uniform stress on each copper wire;

Insulation extrusion: Equipped with an online laser diameter gauge, which detects the insulation thickness every 0.5 seconds. The data is transmitted to the control system in real-time, and the extrusion speed is automatically adjusted when there is an over-tolerance;

Cabling process: A planetary cabling machine is used with a stranding speed of 30m/min to ensure the symmetric arrangement of the three cores and avoid uneven electric field distribution caused by eccentricity.

DC resistance: ≤0.383Ω/km at 20°C (measured by the four-terminal method);

Power frequency withstand voltage: 3kV voltage is applied for 5 minutes, with no breakdown or flashover;

Insulation resistance: ≥100MΩ·km measured by a 500V megohmmeter;

Mechanical properties: Insulation layer tensile strength ≥12MPa, elongation at break ≥150%;

Flame retardant test: In the vertical burning test, the flame spread length ≤50mm, and the self-extinguishing time ≤30 seconds.

Cable reel specifications: Galvanized steel reels with a diameter of 1250mm are used, with a reel thickness of 5mm, an edge height of 180mm, and a central shaft hole diameter of 120mm, which can bear a radial pressure of 1000kg (suitable for forklift loading and unloading). The surface of the steel reel is coated with epoxy anti-rust paint, with no rust after 48-hour salt spray test.

Inner packaging details: The outer layer of the cable is first wrapped with 2 layers of waterproof kraft paper (weight 80g/㎡), then covered with 0.12mm thick PE film (moisture permeability ≤5g/㎡·24h) to form a double moisture-proof barrier. The length of each reel of cable is 100m by default, and it can also be customized to 200m/reel according to order requirements (confirmation is required 7 days in advance).

Identification information: A weather-resistant label is fixed on the side of the steel reel, indicating the product model ("1kV 3X1X50mm² Nyy"), length, production batch number, execution standard, and graphic signs such as "moisture-proof" and "up". The label is printed in both Chinese and English to ensure recognition by international customers.

It should be stored in a well-ventilated and dry indoor warehouse with an ambient temperature of -5°C to 30°C and a relative humidity of ≤60%;

The cable reel must be padded with a wooden frame (height ≥10cm) to keep away from ground moisture and corrosive gases (such as ammonia, chlorine);

The stacking height does not exceed 3 layers, and the bottom steel reel must be fixed with a forklift to prevent dumping;

The storage period is 2 years. If it exceeds the period, the insulation resistance must be re-inspected (≥50MΩ·km can be used), and it must be repackaged and sealed after passing the inspection.

Road transportation: Closed trucks are used within 300km, and anti-slip rubber pads are laid in the carriage. Each reel of cable is fixed on both sides of the carriage with steel belts (4 fixed points per reel), and buffer cotton is filled between the steel reels to avoid collision and wear during transportation. During summer transportation, a sunshade is installed on the top of the carriage to control the internal temperature ≤40°C and prevent overheating and aging of the insulation layer.

Railway transportation: Containers are used for long-distance transportation (≥500km). A 20-foot container can hold 10 reels of 100m cables. 5kg of silica gel desiccant is placed in the container to control the relative humidity ≤60%, and the cable reels are fixed with wooden boards between the container walls to prevent shaking.

Sea transportation: The main transportation method, departing from Shanghai Port/Shenzhen Port to major ports around the world (such as Rotterdam, Dubai), with a voyage of 25-40 days. The cable reels are reinforced with pallets, moisture-proof membranes are laid in the containers, and each reel of cable is covered with a dust cover (to resist salt spray during sea transportation). Bilingual (Chinese and English) versions of the "Packing List" and "Quality Certificate" are attached with the goods.

Air transportation: Air freight is used for emergency orders, with a single reel weight ≤300kg (100m/reel). "Handle with care" and "No rolling" signs are affixed to the packaging, which conforms to IATA dangerous goods transportation rules (cables are not dangerous goods but need to be marked as "non-flammable").

Special spreaders (load-bearing ≥1t) must be used for loading and unloading, with the lifting points located at the center of both sides of the steel reel to avoid cable loosening caused by tilting;

When manually handling short cables (such as 10m/roll), two people need to lift them, and dragging the insulation layer is prohibited to prevent surface scratches.

Whether the packaging is intact (no damage, water stains, deformation);

Whether the label information is consistent with the order (model, length, batch number);

Whether the cable appearance has defects (no scratches or bulges on the insulation layer, and the cabled cable is round);

Whether the length deviation is within the allowable range (±0.5%).

Customers can apply for samples through email, phone or online forms, and 1m long cable samples (including "Test Report") are provided free of charge, which will be sent within 3 working days after application.

The sample test report includes key parameters such as conductor resistance, insulation thickness, and voltage resistance performance, which are consistent with bulk products and can be used as a basis for model selection.

Model selection consultation: Technical engineers provide current-carrying capacity correction tables and laying plan suggestions (such as pipe diameter, cable tray specifications) according to the scenarios provided by customers (such as "workshop power", "commercial power distribution").

Installation guidance: Provide the "Cable Laying and Terminal Processing Manual", including details such as bending radius requirements, fixing spacing (horizontal laying ≥1.5m, vertical laying ≥2m), and cold-shrink terminal installation steps. If necessary, technical personnel can be sent for on-site guidance (free for domestic customers, travel costs are charged for international customers).

Troubleshooting: 7×24-hour technical hotline responds to provide solutions for problems such as "overload heating" and "insulation aging", such as suggesting to increase the cable cross-section or change the laying method.

The product provides a 24-month warranty period (calculated from the date of acceptance). For faults caused by the product's own quality problems (such as insulation layer cracking, conductor oxidation) within the warranty period, the same specification cable will be replaced free of charge, and the round-trip freight will be borne.

For damages caused by human factors (such as mechanical damage, overvoltage breakdown), paid maintenance services are provided (only the material cost is charged), and a "Fault Analysis Report" is issued to put forward preventive suggestions.

Balanced Performance: With a 50mm² cross-section, it fills the gap between small-section (≤35mm²) and large-section (≥70mm²) cables, meeting the power needs of medium-sized equipment while avoiding the waste of large-section cables.

Environmental Adaptability: The insulation layer has multiple properties such as oil resistance, moisture resistance, and UV resistance, and can operate stably in industrial workshops, commercial buildings, and outdoor environments, reducing the need for additional protection measures.

Safety and Reliability: Strict quality control from raw materials to finished products ensures that the failure rate is less than 0.1% within 5 years of use. The flame retardant and low-smoke characteristics meet the safety requirements of public places.

Cost-effectiveness: Compared with imported cables of the same specification, the price is 15-20% lower, while the performance is equivalent, reducing the overall procurement cost for customers.

Mature Production Technology: With 15 years of cable production experience, the company has optimized the stranding and insulation extrusion processes, and the product qualification rate is 2-3 percentage points higher than the industry average.

Complete Certification System: The product has passed IEC, CE, UL and other international certifications, and has obtained domestic CCC certification, which can meet the import requirements of various countries.

Flexible Customization Capabilities: It can be customized according to customer needs, such as adjusting the cable length, adding armor layers (for special environments), etc., with a minimum order quantity of 500m.

Global Service Network: In addition to domestic after-sales points, cooperative service providers are established in Europe, Southeast Asia, and other regions to provide localized technical support and maintenance services.