RVV Cable 4 Core 1.5mm² 2.5mm² 4mm² 6mm² Flexible PVC Power Wire for Electrical Wiring

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2025-08-28 08:38:03

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Product Introduction

Comprehensive Analysis of RVV 4-Core 1.5mm²/2.5mm²/4mm²/6mm² Flexible PVC Power Wire for Electrical Wiring

In the field of electrical wiring, the RVV 4-core 1.5mm²/2.5mm²/4mm²/6mm² flexible PVC power wire has become a core choice for home decoration, commercial premises operation, and industrial equipment power supply, thanks to its multi-specification coverage, flexible constructability, and safe and reliable performance. Whether it is for weak current control of smart home appliances or power transmission for factory motors, this series of power wires can accurately adapt to scenario requirements. This article will conduct an in-depth analysis of its performance details and service system from two major dimensions: the product itself and general information, providing professional references for purchasers, construction teams, and end-users.

I. From the Perspective of the Product Itself: Analysis of Core Performance and Production Details

The quality of the product itself is the foundation for ensuring long-term safe and stable electrical wiring. The RVV 4-core flexible PVC power wire adheres to the core design concept of "adapting to diverse scenarios and balancing safety and efficiency" in terms of specifications and parameters, characteristic uses, material styles, and production processes. It has undergone multiple rounds of technical optimization and strict quality control to ensure reliable power supply in different environments.

(I) Specifications and Parameters: Accurately Matching Scenario Power Requirements

In electrical wiring scenarios, there are large differences in equipment power and complex laying environments (such as wall concealed pipes, narrow spaces inside equipment, and high-altitude cable trays), which impose diverse requirements on the electrical performance, mechanical performance, and adaptability of power wires. This series of power wires forms a complete product system covering low, medium, and high power through differentiated specification design.

1. Electrical Performance Parameters: Ensuring Transmission Efficiency and Safety

Conductor DC Resistance: As a core indicator of conductivity, this series of power wires uses high-purity oxygen-free Copper Conductors. The DC resistance at 20℃ is strictly controlled at an industry-leading level—≤13.3Ω/km for the 1.5mm² model, ≤8.21Ω/km for the 2.5mm² model, ≤5.38Ω/km for the 4mm² model, and ≤3.08Ω/km for the 6mm² model—all lower than the upper limits specified in the GB/T 5023.5-2008 standard (e.g., the upper limit for 1.5mm² is 13.3Ω/km, and it is usually controlled at 90%-95% of the standard value in actual production). The low-resistance characteristic can effectively reduce current transmission losses. Taking a 100-meter 1.5mm² power wire as an example, its line loss is only 85% of that of ordinary electrolytic Copper Power Wires, which can reduce electricity costs for homes and commercial premises in long-term use.

Rated Voltage and Current-Carrying Capacity: The rated voltage is uniformly 300/500V, which is compatible with China's 220V single-phase electricity for homes and 380V three-phase electricity for commercial and industrial systems. It can also resist transient overvoltages in the power grid (such as voltage fluctuations during thunderstorms). The long-term safe current-carrying capacity is accurately divided according to the cross-sectional area:

1.5mm² model: Current-carrying capacity of 16-20A when laid in air (ambient temperature 30℃), and 14-18A when laid in pipes (2-3 in parallel), suitable for power ≤4.4kW, meeting the needs of low-power equipment such as smart door locks and curtain motors;

2.5mm² model: Current-carrying capacity of 25-32A when laid in air, and 20-25A when laid in pipes, suitable for power ≤7kW, capable of carrying medium-power equipment such as 1.5HP air conditioners and 2000W electric heaters;

4mm² model: Current-carrying capacity of 32-40A when laid in air, and 25-32A when laid in pipes, suitable for power ≤8.8kW, ideal for high-power scenarios such as shopping mall lighting main lines and 3000W commercial freezers;

6mm² model: Current-carrying capacity of 40-50A when laid in air, and 32-40A when laid in pipes, suitable for power ≤11kW, applicable to large-power equipment such as villa entry branch circuits and 7.5kW factory air compressors.

Insulation and Sheath Performance: Both the insulation layer and sheath layer are made of environmentally friendly PVC material, with an insulation resistance of ≥100MΩ·km (at 20℃), far exceeding the standard requirement of ≥50MΩ·km. It can effectively isolate the conductor from the outside world and avoid leakage risks. The voltage resistance performance reaches no breakdown under 1500V AC for 1 minute, which can cope with transient high-voltage impacts in the line; the long-term temperature resistance range is -15℃ to 70℃, and the short-term overload temperature resistance is 105℃. In high-temperature environments of distribution boxes in summer (50-60℃) or low-temperature outdoor environments in northern winter (-10℃), it can still maintain stable performance without softening or cracking.

2. Mechanical Performance Parameters: Adapting to Complex Construction Environments

Flexibility and Bending Performance: Adopting a multi-strand fine Copper Wire stranding structure, the minimum bending radius is only 4 times the cable outer diameter (static) and 6 times (dynamic). Taking the 2.5mm² model as an example, its outer diameter is approximately 6.5mm, and the static bending radius only needs 26mm. It can be easily threaded into 16mm wall concealed pipes or flexibly laid in narrow spaces inside equipment (such as elevator control cabinets), avoiding construction difficulties caused by the large bending radius of single-strand rigid wires. After 1000 dynamic bending tests (bending angle ±90°, frequency 10 times per minute), there is no conductor breakage or sheath layer cracking, meeting the repeated bending needs during later equipment maintenance.

Tensile and Wear-Resistant Performance: The conductor stranding process endows the power wire with excellent tensile strength—≥120N for the 1.5mm² model, ≥180N for the 2.5mm² model, ≥250N for the 4mm² model, and ≥320N for the 6mm² model. It can withstand moderate pulling during construction without conductor breakage. The sheath layer has a tensile strength of ≥12MPa and an elongation at break of ≥150%, which can resist slight friction with pipes and sand when embedded in walls; the scratch resistance complies with the GB/T 5023.5-2008 standard, with no obvious scratches when scratched with an H-hardness pencil under a pressure of 5N, further ensuring the integrity of the sheath during laying.

(II) Characteristic Uses: Covering All-Scenario Electrical Wiring Needs

Based on accurate specifications and parameters and excellent performance, the uses of this series of power wires present the characteristics of "scenario segmentation and power adaptation". It can provide stable power supply solutions from home weak current to industrial strong current, and from static equipment to dynamic devices.

1. Home Scenarios: Adapting to Smart and Traditional Power Needs

In the decoration of ordinary residences and villas, power wires of different specifications have clear divisions of labor:

1.5mm² model: Focuses on weak current control and small household appliance power supply. For example, power supply for smart door locks (power approximately 5W, current ≤0.02A), wiring for curtain motors (power approximately 30W, current ≤0.14A), and signal wires for smart lighting control systems (needing to transmit both power and control signals). Its low-resistance characteristic can ensure no delay in signal transmission, and the 4-core structure uses 1 Core for power supply, 2 Cores for signal transmission, and 1 core as a backup, reducing the number of cable layouts. In addition, it can also be used as a power wire for small household appliances such as humidifiers (power approximately 200W) and air purifiers (power approximately 150W), adapting to their low-power needs.

2.5mm² model: Takes on the core role of home strong current circuits. It is used in scenarios such as ordinary sockets in living rooms and bedrooms (connecting TVs, laptops, etc., with total power ≤2kW), 1.5HP wall-mounted air conditioners (power approximately 1100W, current approximately 5A), and bedroom electric heaters (power 2000W, current approximately 9A). In villa decoration, it can also be used as the lighting main line for the second and third floors, carrying centralized power supply for lamps in multiple rooms (total power ≤5kW), with sufficient current-carrying capacity margin to avoid overload when multiple devices are turned on simultaneously.

4mm² and 6mm² models: Adapt to high-power needs of large apartments and villas. The 4mm² model can be used as a dedicated line for high-power household appliance clusters in the kitchen, such as the total power supply circuit for built-in ovens (power 3000W), dishwashers (power 1500W), and refrigerators (power 300W), with a total power ≤4800W and current approximately 21.8A, which is completely within its current-carrying capacity range; the 6mm² model is used for villa entry branch circuits (such as basement power supply), dedicated line power supply for whole-house water purification systems (power 1000W) and floor heating boilers (power 8000W), ensuring stable transmission of large currents and avoiding line heating.

2. Commercial Scenarios: Supporting Premises Operation and Equipment Operation

In commercial premises such as shopping malls, office buildings, and hotels, this series of power wires is the "power blood vessel" ensuring operation:

1.5mm² model: Used for weak current systems and small equipment. For example, smart shopping guide screens in shopping malls (power approximately 50W), office printers in office buildings (power approximately 300W), and smart control panels in hotel rooms (needing to transmit both power and control signals). The 4-core structure can meet both power supply and signal transmission needs, reducing the number of wall wirings and maintaining the aesthetics of decoration.

2.5mm² model: Adapts to ordinary sockets and medium-power equipment. Fitting room sockets in shopping mall clothing stores (connecting hair dryers, irons, with total power ≤1.5kW), conference room projectors (power approximately 500W) and air conditioners (1HP, power approximately 735W) in office buildings, hotel room TVs (power approximately 150W) and mini-refrigerators (power approximately 100W), its current-carrying capacity can easily cope with the simultaneous operation of multiple devices.

4mm² model: Undertakes power supply for high-power equipment and regional main lines. Commercial freezers in the catering area of shopping malls (power 3000W), electric water heaters in the pantry of office buildings (power 2000W), disinfection cabinets in hotel kitchens (power 1500W), etc., all require 4mm² dedicated lines for power supply; at the same time, it can also be used as the lighting main line for a certain floor of a shopping mall, carrying centralized power supply for dozens of LED spotlights (total power ≤8kW).

6mm² model: Used for main incoming lines and large equipment in commercial premises. For example, total power supply for freezer clusters in shopping mall supermarkets (total power ≤10kW), outdoor units of central air conditioners in office buildings (power 7.5kW), and industrial washing machines in hotel laundry rooms (power 5kW), its large current-carrying capacity characteristic can ensure stable power when multiple devices are operating simultaneously.

3. Industrial Scenarios: Adapting to Equipment Power and Control Needs

In industrial environments such as factory workshops and warehouse logistics, this series of power wires needs to cope with complex working conditions of high load and multiple interferences:

1.5mm² model: Used for equipment control circuits. For example, power supply for assembly line sensors (power approximately 10W), LED indicator lights on warehouse shelves (total power ≤500W), and control signal wires for small motors (needing to transmit both power and control signals). The 4-core structure can avoid signal interference and ensure accurate operation of equipment.

2.5mm² model: Adapts to small power equipment. Such as small bench drills in workshops (power 750W), charging stations for warehouse logistics code scanners (total power ≤300W), and electric heaters in factory changing rooms (power 2000W), its temperature resistance and wear resistance can adapt to workshop dust and slight oil pollution environments.

4mm² model: Undertakes power supply for medium-sized equipment. For example, assembly line conveyor motors in workshops (power 4kW), charging circuits for warehouse stackers (power 3kW), and small instruments in factory laboratories (total power ≤8kW), its current-carrying capacity can meet the needs of continuous high-load operation of equipment.

6mm² model: Used for large equipment and power main lines. Such as factory air compressors (power 7.5kW), refrigeration units in warehouse cold storage (power 10kW), and incoming lines of workshop power distribution boxes, its large cross-sectional area conductor can reduce line losses, ensure long-term stable operation of equipment, and reduce industrial electricity costs.

(III) Material and Style: Balancing Performance, Safety, and Construction Convenience

Material selection determines the core performance of the power wire, and style design affects construction efficiency and later maintenance. This series of power wires has dual optimizations in materials and styles, not only ensuring long-term safe electricity use but also improving scenario adaptability.

1. Material Selection: Focusing on Safety and Durability

Conductor Material: High-purity oxygen-free copper with a purity of ≥99.99% is used. Compared with ordinary electrolytic copper (purity 99.95%), it has three core advantages:

First, higher conductivity efficiency, with a conductivity of ≥101% IACS (ordinary copper is 97-98% IACS), generating less Joule heat during current transmission. Taking a 100-meter 4mm² power wire as an example, when carrying a 30A current, the temperature of the oxygen-free copper wire is 4-6℃ lower than that of the ordinary electrolytic copper wire, avoiding accelerated aging of the insulation layer due to long-term high temperatures;

Second, stronger fatigue resistance. The crystal structure of oxygen-free copper is uniform, and it is not easy to produce cracks during repeated bending (such as wire shaking caused by equipment vibration). After 1000 dynamic bending tests, the conductor breakage rate is 0, while that of ordinary electrolytic copper wires is about 6-8%;

Third, better corrosion resistance. The oxygen content is ≤0.003%, so it is not easy to oxidize and produce patina in humid and slightly chemically corrosive environments of industrial workshops, avoiding increased resistance due to reduced conductor cross-sectional area. When placed in a simulated humid environment (temperature 30℃, humidity 85%) for 1 year, the resistance change rate of the oxygen-free copper conductor is ≤2%, while that of ordinary electrolytic copper is 5-10%.

The conductor adopts a multi-strand fine copper wire stranding process, and the stranding parameters of different specifications are precisely designed: 1.5mm² is composed of 19 strands of Φ0.32mm copper wire, with a stranding pitch of 18-22mm; 2.5mm² is composed of 19 strands of Φ0.41mm copper wire, with a stranding pitch of 20-25mm; 4mm² is composed of 37 strands of Φ0.37mm copper wire, with a stranding pitch of 25-30mm; 6mm² is composed of 49 strands of Φ0.41mm copper wire, with a stranding pitch of 30-35mm. This design maximizes flexibility while ensuring the roundness of the conductor, facilitating pipe threading during construction.

Insulation and Sheath Material: Environmentally friendly PVC (polyvinyl chloride) material is used, complying with the RoHS standard (free of lead, mercury, and other harmful substances), and the formula has been specially optimized:

First, improved temperature resistance, with long-term temperature resistance from -15℃ to 70℃ and short-term overload temperature resistance of 105℃. In low-temperature outdoor environments in northern winter or high-temperature environments of distribution boxes in summer, the insulation and sheath layers do not crack or soften;

Second, enhanced corrosion resistance, with the addition of oil-resistant and acid-alkali-resistant additives. In kitchen oil pollution and slightly chemically corrosive environments of factories, the sheath layer is not easy to age and crack, with a service life of 8-10 years, far exceeding the 5-6 years of ordinary PVC Wires;

Third, compliant flame retardancy, with the addition of Sb₂O₃ and chlorinated paraffin flame retardants, passing the GB/T 18380.1-2008 ZC-grade flame retardant test. It self-extinguishes within 30 seconds when exposed to fire, and the chlorine release is ≤5mg/g, avoiding harm to personnel from toxic gases during fires.

The thickness of the insulation layer and sheath layer is designed differently according to specifications: for the 1.5mm² model, the insulation thickness is ≥0.8mm and the sheath thickness is ≥0.6mm; for the 2.5mm² model, the insulation thickness is ≥0.9mm and the sheath thickness is ≥0.7mm; for the 4mm² model, the insulation thickness is ≥1.0mm and the sheath thickness is ≥0.8mm; for the 6mm² model, the insulation thickness is ≥1.2mm and the sheath thickness is ≥1.0mm. The thickness deviation is ≤±0.1mm, which not only ensures insulation safety but also avoids pipe threading difficulties due to excessive thickness.

2. Style Design: Adapting to Construction and Maintenance Needs

Appearance Style: A circular cross-section design is adopted, with 4 Conductors distributed symmetrically. After being evenly wrapped by the insulation layer, an outer sheath layer is applied, resulting in a smooth and flat surface without protrusions or depressions. The advantages of this design are:

First, low pipe-threading resistance. The circular cross-section has a small contact area with the inner wall of the pipe, resulting in low friction resistance. It can be easily pulled by a threader during construction, especially for long-distance pipe threading (e.g., wall concealed pipes over 10 meters), where it is not prone to jamming.

Second, uniform heat dissipation. The heat dissipation area of the circular cross-section is symmetrical, allowing heat generated during current transmission to be dissipated evenly, avoiding local overheating.

Third, clear identification. The surface of the sheath layer is printed with continuous product information, including model (RVV), specification (4×1.5mm², etc.), rated voltage (300/500V), execution standard (GB/T 5023.5-2008), production batch number, and production date. Wear-resistant ink (complying with the ISO 105-A02 standard) is used, which remains legible after long-term friction, facilitating specification verification during construction and traceability during later maintenance.

Color Style: Multiple sheath color options are provided to meet the color-coding requirements of different scenarios:

Black: A universal color suitable for most concealed laying scenarios (e.g., wall concealed pipes, inside equipment), which is dirt-resistant and easy to maintain.

White: Suitable for exposed installation scenarios such as homes and hotels (e.g., ceiling surface wiring), with high integration with decoration styles.

Gray: Mostly used in commercial and industrial premises, facilitating coordination with the colors of equipment and cable trays.

Yellow-green bicolor: A specially customized color used for grounding or emergency circuits, complying with national electrical safety standards and avoiding wiring errors.

The color fastness complies with the GB/T 10125-2021 standard. After 500 hours of xenon lamp aging testing, the color change grade is ≥4 (on a 5-grade scale), with no obvious fading, ensuring that the color can still distinguish circuit functions after long-term use.

(IV) Production Process: Strict Control to Ensure Product Consistency

The production process is the "lifeline" of product performance. This series of power wires adopts advanced equipment and standardized processes, covering conductor manufacturing, insulation extrusion, cabling, sheath extrusion, and quality inspection, ensuring that every meter of wire meets standards.

1. Conductor Manufacturing: Precise Control from Copper Rod to Stranded Conductor

Copper Rod Selection and Wire Drawing: Φ8mm high-purity oxygen-free copper rods (purity ≥99.99%) are selected. First, a spectrophotometer is used to detect impurity content (iron, lead, etc. ≤0.001%) to ensure material compliance. Then, a continuous wire drawing machine is used for multi-pass drawing:

1.5mm² model: After 11 passes of drawing, the copper rod is drawn into Φ0.32mm fine copper wire, with a drawing speed of 80-90m/min. A diamond die (service life ≥12,000 meters) is used to ensure uniform wire diameter (deviation ≤±0.005mm).

2.5mm² model: After 12 passes of drawing, it is drawn into Φ0.41mm fine copper wire, with a drawing speed of 75-85m/min.

4mm² model: After 13 passes of drawing, it is drawn into Φ0.37mm fine copper wire, with a drawing speed of 70-80m/min.

6mm² model: After 12 passes of drawing, it is drawn into Φ0.41mm fine copper wire, with a drawing speed of 75-85m/min (same as the 2.5mm² model, but with more strands for stranding).

During the drawing process, a water-soluble drawing fluid (containing extreme pressure agents, rust inhibitors, and coolants) is used to cool the copper wire and reduce friction between the copper wire and the die. The temperature of the drawing fluid is controlled at 30-40℃ to avoid copper wire overheating (which may cause oxidation) or excessive die wear.

Online Annealing: After drawing, the fine copper wire enters an online annealing furnace for annealing treatment. The annealing temperature is precisely controlled according to the wire diameter: 370-400℃ for Φ0.32mm copper wire, 380-420℃ for Φ0.41mm copper wire, and 360-400℃ for Φ0.37mm copper wire. The annealing time is 8-12 seconds, and nitrogen (purity ≥99.99%) is used as the protective atmosphere to prevent copper wire oxidation during annealing. The purpose of annealing is to eliminate internal stress generated during drawing (the hardness of the copper wire before annealing is ≥HV80, and after annealing, it is reduced to HV40-50) and improve the flexibility and conductivity of the copper wire (the conductivity after annealing is ≥101% IACS, an increase of 3-5% compared to before annealing).

Stranding Process: The annealed fine copper wire is stranded into conductors of the required cross-sectional area using a high-speed stranding machine:

1.5mm² model: 19 strands of Φ0.32mm copper wire are stranded, with a stranding speed of 110-130r/min and a stranding pitch of 18-22mm. The stranding direction is left-handed (complying with the GB/T 3956-2008 standard) to ensure that the conductor does not loosen during bending.

2.5mm² model: 19 strands of Φ0.41mm copper wire are stranded, with a stranding speed of 100-120r/min and a stranding pitch of 20-25mm.

4mm² model: 37 strands of Φ0.37mm copper wire are stranded, with a stranding speed of 90-110r/min and a stranding pitch of 25-30mm.

6mm² model: 49 strands of Φ0.41mm copper wire are stranded, with a stranding speed of 80-100r/min and a stranding pitch of 30-35mm.

During stranding, a tension controller is used to maintain uniform tension of each strand of copper wire (tension deviation ≤±5%), avoiding uneven stress distribution of the conductor (which may cause conductor deformation during bending). After stranding, the conductor is inspected for roundness (roundness error ≤0.1mm) and outer diameter (1.5mm² conductor outer diameter ≈1.38mm, 2.5mm²≈1.78mm, 4mm²≈2.25mm, 6mm²≈2.76mm) to ensure it meets the insulation extrusion requirements.

2. Insulation Extrusion: Uniform Coating to Ensure Insulation Safety

Insulation Material Preparation: Environmentally friendly PVC particles (complying with RoHS standards) are selected as insulation raw materials, with a melting index of 1.2-2.0g/10min (tested at 190℃, 2.16kg) to ensure good fluidity during extrusion. Before extrusion, the PVC particles are dried in a hopper dryer at 75-85℃ for 2-3 hours to remove moisture (moisture content ≤0.1%), avoiding bubbles in the insulation layer (which may cause insulation breakdown).

Extrusion Process: A single-screw extruder (screw diameter 50mm, length-diameter ratio 24:1) is used for insulation extrusion. The extruder temperature is controlled in sections according to the PVC material characteristics:

Feeding section: 130-140℃ (to preheat the material and prevent bridging in the hopper).

Compression section: 145-155℃ (to melt and plasticize the material).

Homogenization section: 155-165℃ (to make the material uniformly plasticized).

Die head temperature: 165-175℃ (to ensure smooth extrusion of the insulation layer).

The stranded conductor passes through the center of the extruder die, and the melted PVC material is evenly wrapped around the conductor surface. The extrusion speed is matched with the conductor traction speed (15-25m/min) to ensure uniform insulation thickness (deviation ≤±0.1mm). A vacuum sizing sleeve is installed at the die exit, and the insulation layer is cooled and shaped with circulating cooling water (temperature 18-22℃), which not only ensures the roundness of the insulation layer but also reduces internal stress (avoiding insulation layer cracking during bending).

Online Inspection: During the insulation extrusion process, two key online inspections are carried out:

Thickness measurement: An online laser thickness gauge is used to real-time monitor the insulation thickness (measuring 6 points on the circumference of the Insulated Conductor every second). If the thickness deviates from the standard (e.g., too thin), the extrusion speed is automatically adjusted.

Spark test: A high-voltage spark tester (applying 12kV AC voltage) is used to detect pinholes or cracks in the insulation layer. If a defect is found (e.g., the spark breaks through the insulation layer), the machine is immediately shut down, and the defective section is cut off (the length of the defective section is ≥1 meter to ensure no residual defects).

3. Cabling: Precise Arrangement of Multi-Core Conductors

After insulation extrusion, the 4 insulated conductors enter a cabling machine for cabling to form a 4-288ac2925daeccfc5b451252efd0f404 Core. The cabling process parameters are strictly controlled:

Cabling Speed: 8-12m/min (adjusted according to the conductor cross-sectional area; larger cross-sections require lower speeds to ensure cabling stability).

Cabling Pitch: 12-15 times the outer diameter of the cable core (e.g., for the 2.5mm² 4-core cable core with an outer diameter of approximately 5.0mm, the cabling pitch is 60-75mm). This pitch design ensures that the cable core does not loosen during bending and maintains good flexibility.

Tension Control: Each insulated conductor is equipped with an independent tension controller (tension deviation ≤±3%) to ensure that the 4 conductors are evenly arranged and the cable core is round.

After cabling, a non-woven wrapping layer (thickness 0.1-0.15mm) is wrapped around the cable core to enhance the integrity of the cable core and prevent the sheath material from seeping into the gaps between conductors during sheath extrusion.

4. Sheath Extrusion: Comprehensive Protection for the Cable Core

Sheath Material Preparation: High-density PVC particles with excellent wear resistance and weather resistance are selected as sheath raw materials, with a tensile strength of ≥15MPa and an elongation at break of ≥180% (after aging). Before extrusion, the particles are dried at 80-90℃ for 1.5-2.5 hours (moisture content ≤0.08%).

Extrusion Process: A single-screw extruder (screw diameter 65mm, length-diameter ratio 25:1) is used for sheath extrusion. The temperature is controlled in sections:

Feeding section: 135-145℃.

Compression section: 150-160℃.

Homogenization section: 160-170℃.

Die head temperature: 170-180℃.

The cabled core (with a wrapping layer) passes through the extruder die, and the melted PVC material forms a uniform sheath layer on the surface. The sheath thickness is controlled according to the specification (e.g., 0.6mm for 1.5mm², 1.0mm for 6mm²), with a deviation of ≤±0.1mm. The traction speed is 12-20m/min, synchronized with the extrusion speed.

Cooling and Marking: After extrusion, the Sheathed Cable is cooled in a water tank (temperature 20-25℃) for 3-5 minutes to solidify the sheath layer. Then, a laser marking machine prints product information (model, specification, etc.) on the sheath surface, with a marking interval of ≤500mm to ensure that the information can be viewed at any position of the cable.

5. Quality Inspection: Multi-Level Testing to Ensure Compliance

In addition to online inspection during production, the finished cables must pass a comprehensive offline quality inspection before leaving the factory, covering electrical performance, mechanical performance, and environmental performance:

Electrical Performance Testing:

DC resistance test: For each specification, 3 samples (each 100m long) are taken to measure the DC resistance at 20℃. The results must be ≤13.3Ω/km (1.5mm²), ≤8.21Ω/km (2.5mm²), ≤5.38Ω/km (4mm²), and ≤3.08Ω/km (6mm²).

Insulation resistance test: The insulation resistance between the conductor and the sheath is measured at 20℃, requiring ≥100MΩ·km.

Voltage resistance test: Apply 1500V AC voltage between the conductor and the sheath for 1 minute, with no breakdown or flashover.

Insulation breakdown voltage test: For random samples (1 sample per 500 coils), the breakdown voltage of the insulation layer is tested, requiring ≥20kV/mm.

Mechanical Performance Testing:

Tensile test: The insulation layer and sheath layer are stripped, and their tensile strength and elongation at break are tested using a tensile testing machine (tensile speed 200mm/min). The requirements are insulation tensile strength ≥12MPa, elongation at break ≥150%; sheath tensile strength ≥15MPa, elongation at break ≥180%.

Bending test: Fix a 1.5m-long cable on a bending tester, bend it 1000 times at a bending angle of ±90° and a frequency of 10 times/min (bending radius is 4 times the cable outer diameter). After the test, there is no conductor breakage, and the insulation and sheath layers have no cracks.

Wear resistance test: Use a Taber wear tester (load 1000g, rotation speed 50r/min) to test the sheath layer. After 500 rotations, the wear depth is ≤0.2mm, and the insulation layer is not exposed.

Environmental Performance Testing:

High-temperature aging test: Place the cable in a constant temperature oven at 80℃ for 168h. After aging, test the tensile strength and elongation at break of the insulation and sheath layers, requiring retention rates ≥70%.

Low-temperature bending test: Place the cable in a low-temperature box at -20℃ for 4h, then bend it around a mandrel (radius 6 times the cable outer diameter) at room temperature. The insulation and sheath layers have no cracks.

Flame retardant test: Conduct the vertical flame test according to GB/T 18380.1-2008. The cable self-extinguishes within 30s after removing the flame, and the burning length is ≤50mm.

All test data are recorded in the "Production Batch Quality Report", which includes test items, standard requirements, test results, and tester signatures. The report is archived for 6 years to facilitate product quality traceability. If any unqualified product is found during inspection, the entire batch is re-inspected; if it is still unqualified, the batch is scrapped (no unqualified products are allowed to leave the factory).

II. From the Perspective of General Product Information: Full-Process Service System

To meet the diverse needs of home decoration users, commercial enterprises, and industrial customers, this series of RVV 4-core flexible PVC power wires has established a comprehensive general service system, covering packaging, transportation, delivery, samples, and after-sales service. This system ensures that customers receive professional support throughout the procurement and use process.

(I) Packaging: Adapt to Different Procurement Scenarios

The packaging of power wires needs to balance protection (preventing insulation/sheath damage during transportation) and convenience (facilitating construction and storage). This series of wires adopts differentiated packaging solutions based on customer types and order quantities:

1. Retail Packaging for Home Users

For individual users or small decoration teams purchasing cables for home renovation (e.g., 1-5 coils of 100m/coil), a "protective + portable" packaging solution is adopted. Each coil of power wire is first wrapped with 2 layers of transparent PE film (thickness 0.05mm) to isolate dust and moisture—critical for users who store cables for 1-2 months before construction, as it prevents the PVC Sheath from absorbing moisture and affecting insulation performance. The PE-wrapped coil is then placed in a customized corrugated carton (material: B=B grade corrugated paper, thickness 4mm) with a moisture-proof coating on the inner wall. The carton features a foldable handle (load-bearing capacity ≥5kg) for easy carrying, and the outer surface is printed with clear guidance information: a "Wiring Specification Prompt" (e.g., "Black wire for live wire, blue for neutral wire, yellow-green for Ground Wire") and a "Storage Warning" (e.g., "Avoid direct sunlight and high-temperature environments above 70℃"). Inside the carton, a 10g desiccant bag and a small cable stripper (suitable for 1.5-6mm² wires) are included as gifts—this small tool addresses the common issue of users lacking professional stripping equipment, significantly improving construction efficiency.

2. Bulk Packaging for Commercial and Industrial Customers

For commercial enterprises (e.g., shopping mall renovation contractors) and industrial customers (e.g., factory equipment suppliers) purchasing large quantities (50+ coils of 500m/coil or 1000m/coil), a "heavy-duty + easy-unwinding" packaging solution is implemented. Power wires are coiled on high-strength wooden or plastic reels:

Wooden reels: Made of pine wood (thickness 20mm) treated with anti-corrosion and anti-insect agents, complying with IP54 protection standards, suitable for outdoor storage at construction sites or factory yards.

Plastic reels: Constructed from HDPE material (impact resistance ≥15kJ/m²), lightweight and reusable, ideal for indoor scenarios such as office Building Wiring or clean factory environments.

Each reel is equipped with a metal central shaft (diameter 50mm) that can be directly mounted on mechanical unwinding machines—this reduces manual labor intensity, allowing one worker to complete unwinding tasks that previously required 2-3 people. The reel surface is labeled with project-specific information: project name, construction area, wire specification (e.g., "RVV 4×2.5mm², black, power supply for 3rd-floor office sockets"), and laying location. Multiple reels are fixed on standard wooden pallets (size 1200mm×1000mm, load-bearing capacity ≥1000kg) using 20mm-wide steel strapping (tensile strength ≥800N) to prevent shifting during transportation. The entire pallet is covered with 3 layers of thickened stretch film (thickness 0.03mm) for waterproof and dustproof protection, and "Fragile" warning labels are affixed to 4 sides of the pallet to remind logistics personnel to handle with care.

3. Special Packaging for International Distributors

For distributors exporting to overseas markets (e.g., Southeast Asia, Europe, North America), a "customized + compliance-focused" packaging solution is provided to meet international transportation and customs requirements:

Material compliance: Wooden reels undergo ISPM 15 fumigation treatment (free of bark, insect eggs, and pests) to avoid quarantine issues in importing countries.

Multilingual labeling: The outer packaging is printed with warning symbols and instructions in 3 languages (English, Spanish, Arabic for regional adaptability), including "Moisture-Proof," "Avoid Heavy Pressure," and product information (HS code: 7326129000, country of origin: China).

Space-saving design: Wires are coiled into 200m/coil standard sizes, and 10 coils are stacked into a cube (height ≤1.2m) wrapped with stretch film to maximize container space utilization—reducing sea freight costs by 15-20% compared to irregular packaging.

Documentation support: A set of customs clearance documents (commercial invoice, packing list, certificate of origin, flame retardant test report) is placed in a waterproof document pouch attached to the pallet, ensuring smooth customs clearance in the destination country.

(II) Transportation: Ensuring Timely and Safe Delivery

The timeliness and safety of power wire transportation directly impact the progress of home decoration, commercial construction, and industrial production. This series of wires has established a multi-modal transportation network and strict management system to adapt to different regional and project needs.

1. Transportation Mode Selection

Express Delivery for Retail Orders: For retail orders (≤5 coils), international express services (DHL, SF Express International) or domestic express (SF Express, JD Logistics) are used. Domestic delivery takes 1-3 days (same-city delivery on the same day, inter-provincial delivery within 2-3 days), and door-to-door service is provided—convenient for individual users or small teams without logistics pickup capabilities. Each express package is insured for 5 times the product value (e.g., a 100m 4×1.5mm² wire valued at 180 yuan is insured for 900 yuan). In case of damage or loss during transportation, the express company provides full compensation within 48 hours.

Road Transportation for Short-Distance Bulk Orders: For customers within 500km (e.g., a Shanghai-based factory supplying to a Suzhou workshop), road transportation is preferred. The company collaborates with logistics providers specializing in electrical material transportation, using closed trucks with temperature control (ambient temperature inside the truck maintained at 5-35℃) and shock-absorbing pads (thickness 50mm) on the carriage floor. This prevents the PVC sheath from softening due to high temperatures (e.g., 40℃+ in summer trucks) or being damaged by vibrations. Transportation time is controlled within 24 hours (e.g., Shanghai to Suzhou takes 2-3 hours), ensuring no project delays due to material shortages.

Railway Transportation for Long-Distance Bulk Orders: For orders exceeding 500km (e.g., a Guangzhou supplier delivering to a Beijing shopping mall renovation project), railway transportation is chosen for its large load capacity (a single freight car can carry 50+ wooden reels) and high on-time rate (≥98%), avoiding road traffic congestion. The company has reserved fixed container slots at major railway hubs (Guangzhou South Railway Station, Beijing West Railway Station). Wires are loaded into 20-foot containers with moisture-proof pads (water absorption rate ≤0.5%) laid on the bottom, and a temperature-humidity recorder is placed inside to monitor data every 30 minutes. If humidity exceeds 70%, the logistics supervisor is notified to activate dehumidification measures.

Sea Transportation for International Orders: For overseas customers (e.g., a Singapore hotel purchasing from a Chinese manufacturer), sea transportation is used for its cost-effectiveness for large batches. The company partners with Maersk and COSCO Shipping, offering FOB, CIF, and DDP trade terms. Wires are packaged in fumigated wooden reels and placed in 40-foot high-cube containers (volume 76.4m³), with buffer boards (thickness 10mm) between reels to prevent collision. The transportation cycle is 15-30 days (Guangzhou to Singapore takes 7-10 days), and the company provides real-time container tracking via a dedicated APP, allowing customers to monitor the shipment’s location and status.

2. Transportation Monitoring and Emergency Handling

Real-Time Monitoring: For bulk orders exceeding 100,000 yuan, GPS trackers and temperature-humidity sensors are installed in transportation vehicles or containers. Customers and the company’s logistics department can access real-time data (location, speed, temperature, humidity) via a cloud platform. For example, if a truck transporting wires to a Wuhan project is stuck in a traffic jam on the Beijing-Hong Kong-Macao Expressway, the platform automatically sends a delay notification to the customer and suggests adjusting the construction schedule.

Emergency Response Plan: In case of unexpected incidents (e.g., heavy rain causing container water seepage, traffic accidents damaging packaging), the logistics department activates an emergency plan within 1 hour:

Alternative Supply: Coordinate with the nearest regional warehouse (the company has 8 warehouses nationwide in China, and 3 overseas warehouses in Vietnam, Germany, and the U.S.) to prepare replacement goods.

On-Site Assessment: Dispatch a professional team to the accident site to inspect the wires—if the insulation and sheath layers are intact, the goods are transferred to another vehicle for delivery; if damaged, the goods are returned and replaced free of charge.

Compensation for Losses: If the delay causes project downtime (e.g., a factory production halt due to missing wires), the company compensates the customer according to the contract (0.5% of the order value per day of delay, up to 5% of the total value).

(III) Delivery: Efficient and Accurate Order Fulfillment

The delivery process directly affects customer satisfaction, so the company has established an efficient delivery management system to ensure orders are processed accurately and delivered on time.

1. Order Processing

Multi-Channel Order Acceptance: Orders are accepted via online platforms (Alibaba, Amazon Industrial), offline sales offices, and a 24-hour hotline. A dedicated order management team (composed of 10 professionals with 3+ years of Electrical Wire experience) verifies order details within 1 working hour, including:

Wire specifications (e.g., "RVV 4×4mm², gray, for factory motor power supply").

Quantity (e.g., "20 coils of 500m/coil").

Delivery address (including detailed street, floor, and contact person).

Payment status (prepayment, partial payment, or credit account).

If there is ambiguity (e.g., a customer only specifies "RVV 4-core wire" without mentioning the cross-sectional area), the team contacts the customer via phone or video call to confirm—for example, recommending 1.5mm² for weak current control and 6mm² for high-power industrial equipment based on the customer’s scenario.

ERP System Integration: After order confirmation, it is entered into the SAP S/4HANA ERP system, which automatically generates a "Production-Delivery Integration Plan":

The warehouse department receives an inventory check task to confirm stock availability.

The production department receives a production task if stock is insufficient.

The logistics department receives a transportation booking task.

Customers can log in to the company’s official website to view real-time order progress (e.g., "Inventory checked, pending packaging," "In transit, estimated arrival on November 10th").

2. Inventory Management and Allocation

The company operates a 20,000㎡ central warehouse in Shanghai (China) and 11 regional/overseas warehouses, with a total inventory of 800,000+ meters of power wires. The warehouse uses a WMS (Warehouse Management System) to implement "first-in-first-out" inventory control—each coil is labeled with a production date, and the system prioritizes delivery of older stock to avoid long-term storage affecting sheath performance. For high-demand specifications (e.g., RVV 4×2.5mm² black), inventory is maintained at 80,000+ meters to ensure 90% of retail orders and 80% of bulk orders are shipped within 24 hours. If a regional warehouse is out of stock (e.g., the Beijing warehouse has no RVV 4×6mm² yellow-Green Wires), the system automatically transfers stock from the nearest warehouse (e.g., Tianjin) and arranges express delivery, ensuring no delivery delays exceeding 1 day.

3. Delivery Time Commitment and Compensation

Clear delivery time standards are set based on order type:

Retail orders: In-stock orders are shipped within 24 hours of payment; out-of-stock orders are delivered within 3-5 working days (including 2-3 days of production and 1-2 days of transportation).

Bulk orders (≤50 coils): In-stock orders are shipped within 48 hours; out-of-stock orders are delivered within 7-10 working days.

Large project orders (>50 coils): Delivery time is negotiated based on the project schedule. For urgent projects (e.g., a hotel opening in 1 month), the company arranges overtime production (24-hour shifts) to shorten delivery to 5-7 days, with only a 10-15% premium on the original price.

If the company fails to deliver on time due to internal issues (e.g., production delays, logistics scheduling errors), compensation is provided per the contract: 0.3% of the order value per day of delay, up to 3% of the total value. This mechanism ensures the company prioritizes delivery timeliness and protects the customer’s project progress.

(IV) Samples: Supporting Informed Purchasing Decisions

Providing samples is critical for customers to verify wire quality and compatibility with their projects. The company has established a standardized sample service system to assist customers in making informed procurement choices.

1. Sample Provision Scope and Specifications

Free samples (1-2 meters per specification) are provided to customers with clear purchasing intentions, including:

Home decoration users: Applying for samples of different specifications (e.g., 1.5mm² and 2.5mm²) to test flexibility (via manual bending) and sheath hardness (via pinching), ensuring compatibility with home wiring needs.

Commercial/industrial customers: Requesting 5-10 meters of samples to conduct professional tests (e.g., DC resistance, insulation resistance, flame retardancy) and include test results in project bid documents to enhance competitiveness.

Distributors: Obtaining samples of all 4 specifications (1.5mm²/2.5mm²/4mm²/6mm²) and multiple colors to demonstrate to downstream customers and assess market demand.

For customers requiring large-scale performance tests (e.g., a national-level construction project needing 10,000-hour aging tests), extended samples (10-20 meters) are provided at cost price—only covering raw material and processing fees (e.g., 1.2 yuan/meter for 1.5mm² wires) with no profit added.

2. Sample Application and Delivery Process

Application Submission: Customers apply for samples through 3 channels:

Filling out the "Sample Application Form" on the company’s official website (providing company name, project type, and required specifications).

Contacting a sales representative via WeChat or phone.

Visiting an offline sales office in person.

Review and Approval: The sales department reviews applications within 1 working hour, verifying the customer’s purchasing intention (e.g., checking if a customer is a registered construction company) and the rationality of sample requests (e.g., whether 20 meters of samples are necessary for a 50㎡ home renovation). Approved samples are prepared; unapproved requests receive explanations (e.g., "Free samples are limited to 2 meters per specification; additional samples require retail purchase").

Sample Preparation and Delivery: Samples are cut from the same production batch as bulk orders to ensure performance consistency. Each sample is labeled with a "Sample Information Card" (model, specification, batch number, production date, test report number) and packed in a transparent plastic bag with a desiccant. Samples are shipped via express delivery within 2 working days (domestic delivery takes 2-3 days, international delivery takes 5-7 days), and customers receive a tracking number to monitor delivery status.

3. Sample Supporting Services

Technical Data Package: A digital package is emailed to customers within 12 hours of sample shipment, including:

Technical Data Sheet (TDS): Detailing electrical performance (DC resistance, insulation resistance), mechanical performance (tensile strength, bending radius), and environmental performance (temperature range, flame retardancy).

Quality Inspection Report (QIR): Including test results for conductor diameter, insulation thickness, and sheath color fastness, issued by the company’s quality inspection department with a qualified stamp.

Wiring Guide: A 10-page PDF with diagrams for correct wiring (e.g., "How to connect power wires to air conditioner terminals") and common mistakes to avoid (e.g., "Do not mix live and neutral wires").

Testing Guidance: The company’s technical support team (composed of engineers with 5+ years of electrical wiring experience) provides free guidance:

For flexibility testing: Sending a "Bending Test Guide" (recommending 100 bends at a radius 4 times the wire outer diameter, checking for sheath cracking).

For troubleshooting: Offering remote assistance via video call if customers encounter abnormal test results (e.g., unusual insulation resistance), helping verify equipment calibration (e.g., multimeter accuracy) and operating steps.

Test Result Analysis: After customers complete testing, the team analyzes results—for example, if a 2.5mm² wire’s DC resistance is 12.8Ω/km (slightly above the standard ≤13.3Ω/km), the team explains it is within the normal range; if resistance exceeds 14Ω/km, a replacement sample is arranged, and the abnormal batch is investigated.

(V) After-Sales Service: Comprehensive Support Throughout the Product Lifecycle

RVV power wires have a long service life (8-10 years in home/commercial use, 5-8 years in industrial environments). The company provides full-lifecycle after-sales service to address customer concerns during use.

1. Pre-Sales Technical Consultation

A 24-hour technical consultation hotline (400-XXX-XXXX) and online platform (WeChat mini-program, official website live chat) are available, staffed by electrical engineers specializing in home, commercial, and industrial wiring:

Home Decoration Consultation: For a 3-bedroom apartment renovation, the engineer recommends a configuration plan: "Use 1.5mm² wires for smart door locks and curtain motors (≈200 meters), 2.5mm² wires for lighting and sockets (≈500 meters), 4mm² wires for air conditioners and electric water heaters (≈150 meters), and yellow-green 2.5mm² wires for ground wires (≈100 meters). Reserve 10% extra length to avoid insufficient wiring due to design changes."

Commercial Project Consultation: For a shopping mall’s food court renovation, the engineer advises: "Use 4mm² wires for commercial freezers and electric stoves (power ≤8kW), and separate circuits for each store to avoid overload. Install residual current circuit breakers (RCCBs) with a rated current of 30mA to prevent electric shock."

Industrial Consultation: For a factory’s assembly line wiring, the engineer suggests: "Use 6mm² wires for 7.5kW motors (current ≈15A, within the 40-50A current-carrying capacity), and choose gray wires to distinguish from other circuits. Lay wires in metal conduits to resist mechanical damage from workshop equipment."

The team also publishes "Wiring Knowledge Guides" on the official website monthly, covering seasonal tips (e.g., "Summer Wiring: Avoid laying wires near high-temperature equipment like boilers") and case studies (e.g., "Analysis of a Short Circuit Caused by Incorrect Core Connection in RVV 4-Core Wires").

2. In-Sales Construction Guidance

On-Site Guidance for Key Projects: For large-scale projects (e.g., a 5-star hotel renovation, a data center construction), the company dispatches 1-2 senior engineers to the site within 24-48 hours:

Installation Demonstration: Showing workers how to strip the sheath (using a dedicated stripper to avoid damaging the inner insulation), arrange the 4 Cores (separating power and signal cores to reduce interference), and fix the wires (using cable clips every 80cm for ceiling wiring).

Quality Inspection: Using professional tools to check:

Conductor connection tightness (using a torque wrench to ensure terminal torque meets standards: 1.5mm² wires ≈1.2N·m, 6mm² wires ≈4.5N·m).

Insulation integrity (using a 15kV spark tester to detect pinholes in the sheath).

Circuit continuity (using a multimeter to confirm all 4 cores are connected correctly).

Worker Training: Conducting a 2-hour training session on safety operations (e.g., turning off the main power before wiring) and common issues (e.g., how to troubleshoot a no-power issue caused by a loose core connection).

Remote Guidance for Ordinary Projects: For home decoration or small commercial projects, the company provides guidance via video calls, phone calls, and WeChat messages. Customers can use their mobile phones to show the on-site wiring environment (e.g., wall pipe layouts, equipment connection ports), and engineers will provide real-time guidance:
If the wire gets stuck while threading through a narrow wall pipe, the engineer will suggest: "Apply a small amount of talcum powder to the wire surface to reduce friction, and pull the wire slowly at a uniform speed instead of forcefully tugging to avoid sheath damage."

For incorrect core connection (e.g., mixing up power and signal cores in smart lighting wiring), the engineer will send a "4-Core Wiring Diagram" via WeChat, clearly marking which core is for power (red/black), which is for signal (blue/white), and which is for backup (yellow-green), ensuring accurate connection.

The company also provides pre-recorded "Standard Installation Videos" (5-8 minutes each) covering key operations such as "How to Connect RVV Wires to Socket Terminals" and "Waterproof Treatment for Wires in Humid Areas (Bathrooms/Kitchens)". Customers can watch these videos repeatedly to standardize their construction processes.

3. After-Sales Maintenance and Warranty

To address customer concerns about long-term use, the company offers a comprehensive maintenance and warranty system tailored to the 8-10 year service life of the RVV 4-core power wires:

(1) Warranty Period and Scope

Basic Warranty: A 2-year warranty is provided from the date of delivery. During this period, if the wire experiences quality issues due to manufacturing defects—such as sheath cracking caused by substandard PVC materials, conductor breakage from uneven stranding, or insulation failure leading to leakage—the company will provide free replacement of the defective wires and bear all transportation and installation costs.

Extended Warranty: For commercial and industrial customers (e.g., shopping malls, factories) with long-term project needs, an extended warranty service is available, extending the warranty period to 3-5 years. The extended service includes annual on-site inspections: engineers visit the customer’s site to test the wire’s electrical performance (e.g., measuring DC resistance to check for conductor oxidation, testing insulation resistance to ensure no leakage risks) and inspect the sheath for wear (especially in high-traffic or high-humidity areas). A detailed "Maintenance Report" is issued after each inspection, with recommendations such as "Replace the 4×1.5mm² wires in the kitchen’s oil-polluted area within 1 year to avoid sheath aging".

(2) Fault Response and Handling

The company follows a "2-4-8 Fault Resolution Rule" to ensure efficient handling of customer-reported issues:

Response Within 2 Hours: After receiving a fault report (via hotline, online platform, or sales representative), the after-sales team confirms the fault details (e.g., fault location, phenomenon, and impact on operations) with the customer within 2 hours and assigns a dedicated engineer to the case.

Preliminary Solution Within 4 Hours: The engineer analyzes the possible cause of the fault within 4 hours and proposes a preliminary solution. For example, if the fault is "intermittent power loss in the office socket circuit", the engineer may suggest: "Check whether the 4-core connection at the distribution box is loose, especially the neutral wire core, as loose connections often cause intermittent power issues."

On-Site Resolution Within 8 Hours (Domestic): If the preliminary solution fails or the fault requires on-site diagnosis (e.g., wire breakdown inside a wall), the company dispatches a maintenance team to the site within 8 hours (arrival within 4 hours for first-tier cities, 24 hours for remote areas). The team carries professional equipment such as cable fault locators (to pinpoint hidden breakdown points) and insulation resistance testers (to assess insulation integrity). After resolving the fault (e.g., replacing the defective wire section, reprocessing the connection), the team tests the wire’s performance again (ensuring insulation resistance ≥100MΩ·km and stable current transmission) and obtains the customer’s confirmation before leaving.

(3) Daily Maintenance Guidance

To help customers extend the wire’s service life, the company provides regular maintenance guidance:

Seasonal Reminders: Every 6 months, the after-sales department sends SMS/email reminders to customers, such as "Summer Maintenance: Check the temperature of wires near air conditioners and refrigerators to prevent overheating; clean dust off wire surfaces to avoid insulation aging" and "Winter Maintenance: Avoid placing heavy objects on exposed wires to prevent sheath cracking in low temperatures".

Online Maintenance Resources: The official website and WeChat public account publish "RVV Wire Daily Maintenance Manuals", which include simple inspection methods (e.g., "Use a multimeter to test insulation resistance between cores monthly; if the value is below 50MΩ·km, contact the after-sales team immediately") and dos/don’ts (e.g., "Do not paint over wires; do not use wires to hang heavy objects").

4. Customer Complaint Handling

The company treats customer complaints seriously and has established a standardized "3-5-7 Complaint Handling Process" to ensure fairness and satisfaction:

Acknowledge Within 3 Hours: After receiving a complaint, the after-sales manager contacts the customer within 3 hours to acknowledge the issue, apologize for any inconvenience, and explain the subsequent handling steps (e.g., "We will arrange an engineer to investigate the cause within 5 working days and propose a solution within 7 working days").

Investigate Within 5 Working Days: A cross-departmental investigation team (including representatives from production, quality inspection, and logistics) is formed to identify the root cause of the complaint. For example, if a customer complains about "sheath peeling after 3 months of use", the team will:

Review the production records of the corresponding batch (e.g., PVC material batch number, sheath extrusion temperature parameters) to check for process deviations.

Analyze the customer’s use environment (e.g., whether the wire is exposed to oil, chemicals, or extreme temperatures) to rule out improper use.

Conduct performance tests on the same-batch wires in the warehouse (e.g., tensile testing of the sheath, low-temperature bending testing) to verify if the product meets quality standards.

The investigation results are compiled into a "Complaint Investigation Report" with clear conclusions (e.g., "The sheath peeling is due to a temporary increase in PVC plasticizer content during production, which is a manufacturing defect").

Resolve Within 7 Working Days: Based on the investigation report, the company proposes a solution to the customer. Common solutions include:

Replacement: Free replacement of all defective wires, with the company covering transportation and installation costs.

Compensation: If the complaint causes project delays or economic losses (e.g., a restaurant’s business suspension due to a wire short circuit), the company negotiates compensation (e.g., providing a 10% discount on the next order, compensating for direct losses such as lost revenue).

Process Improvement Commitment: If the complaint reflects a systemic issue (e.g., multiple customers reporting the same sheath problem), the company commits to optimizing production processes (e.g., adding an additional quality inspection step for PVC materials) and provides a timeline for improvement.

After the solution is implemented, a follow-up visit is conducted within 1 week to confirm the customer’s satisfaction. All complaint cases and handling results are recorded in a "Complaint Database", which is reviewed quarterly to identify recurring issues and drive product/service improvements (e.g., if 5+ complaints about "core disconnection" are received, the R&D team optimizes the stranding process to enhance core cohesion).

(VI) Summary of General Product Information

The general product information system of the RVV 4-core 1.5mm²/2.5mm²/4mm²/6mm² flexible PVC power wire—covering packaging, transportation, delivery, samples, and after-sales service—is designed to address the full lifecycle needs of customers, from procurement to long-term use.

Differentiated packaging ensures protection and convenience for diverse customer groups (retail users, bulk buyers, international distributors); multi-modal transportation and real-time monitoring guarantee timely and safe delivery, minimizing project delays; efficient order processing and inventory management ensure 90% of in-stock orders are shipped within 24 hours; standardized sample services help customers make informed purchasing decisions; and comprehensive after-sales support (technical consultation, construction guidance, maintenance, complaint handling) solves customer worries throughout the wire’s service life.

This system not only enhances the product’s market competitiveness but also builds long-term trust with customers. For home users, it simplifies the complex wiring process and ensures safety; for commercial/industrial customers, it supports project efficiency and reduces operational risks; for distributors, it provides reliable logistics and after-sales backing to expand market share.

Looking ahead, the company will continue to optimize this service system based on customer feedback—for example, launching an intelligent after-sales APP (allowing customers to submit fault reports and track handling progress in real time) and expanding the global logistics network (adding regional warehouses in Southeast Asia and Europe to shorten delivery times for international customers). By integrating product quality with customer-centric services, the RVV 4-core flexible PVC power wire will remain a leading choice in the global electrical wiring market.