This product is designed to meet the complex power supply needs of industrial, mining, and solar scenarios, focusing on providing two mainstream structures: 3-core and 4-core. The conductor arrangement of each core count is optimized for specific scenarios. The 3-Core Cable adopts a "triangular" or circular stranded arrangement. The "triangular" arrangement reduces the overall outer diameter of the cable, saving installation space, and is suitable for dense wiring in narrow underground mine roadways or inside industrial equipment. The circular stranded arrangement ensures a more stable cable structure and higher mechanical strength, making it suitable for overhead installation in industrial workshops or long-term fixed use in cable trays of solar power plants. The 4-core cable adopts a "3+1" structure (3 main power supply cores + 1 grounding core). The main power supply cores are responsible for power transmission, while the grounding core can be directly connected to the grounding system, eliminating the need for additional Grounding Wire installation. This significantly improves construction efficiency in scenarios such as underground mines and industrial equipment rooms while ensuring electrical safety.

Whether it is a 3-core or 4-core cable, each conductor is independently wrapped with an XLPE insulation layer. The thickness of the insulation layer is precisely matched to the cross-sectional area specification: 0.8mm-1.2mm for 16mm²-70mm², 1.2mm-1.6mm for 120mm²-240mm², and 1.6mm-2.0mm for 250mm²-400mm². This ensures stable insulation performance in different power transmission scenarios. After stranding the Multi-Core conductors, flame-retardant glass fiber ropes are filled in the gaps. On one hand, this makes the cable core structure tighter, preventing insulation layer wear caused by conductor displacement; on the other hand, it enhances the overall flame-retardant performance of the cable, meeting fire safety requirements in industrial and mining scenarios.

2. Conductor Cross-Sectional Area and Current-Carrying Capacity

The conductor cross-sectional area covers the full range of 16mm²-400mm². The current-carrying capacity of each specification has been tested by authoritative institutions and is suitable for power requirements of different scenarios. At an ambient temperature of 25℃, the 16mm² cable has a current-carrying capacity of 85A when installed in air and 98A when installed in soil. It is suitable for connecting solar photovoltaic panel strings (the power of a single photovoltaic string is usually 300W-500W, and the 16mm² cable can meet the transmission needs of multiple series-parallel strings) as well as power supply for small mining ventilators (power 5kW-10kW) and lighting systems (total power not exceeding 15kW). The 25mm² cable has a current-carrying capacity of 110A in air and 125A in soil, and can be used for input lines of small industrial workshop motors (power 15kW-22kW) or solar inverters (power 10kW-15kW).

The 70mm² Cable has a current-carrying capacity of 215A in air and 240A in soil, which can meet the power supply needs of medium-sized mining transportation equipment (such as scraper conveyors with power 45kW-75kW) and medium-sized industrial workshop motors (power 75kW-90kW). The 120mm² cable has a current-carrying capacity of 310A in air and 350A in soil, and can be used as the output line of a solar power plant combiner box (concentrating 20-30 photovoltaic strings) or a branch line of an industrial high-voltage distribution cabinet (rated current below 300A). The 240mm² cable has a current-carrying capacity of 480A in air and 540A in soil, suitable for the main power supply lines of large mining roadheaders (power 200kW-300kW) and large industrial compressors (power 300kW-400kW). The 400mm² cable has a current-carrying capacity of 650A in air and 720A in soil, serving as the main transmission line connecting the step-up station (power above 500kW) of a solar power plant to the power grid, or the outgoing cable of the central substation in an underground mine. It can stably carry ultra-high load currents, with a long-term operating temperature not exceeding 90℃ and a short-circuit temperature (within 5 seconds of duration) not exceeding 250℃, avoiding safety hazards caused by overload.

3. Weather Resistance and Protection Performance Parameters

The overall weather resistance of the cable has undergone rigorous testing. Within a temperature range of -40℃ to 90℃, the insulation layer will not crack, harden, or soften, and the conductor resistance change rate does not exceed 5%. This makes it suitable for use in underground mines in cold northern regions (winter temperatures can drop to -20℃) and high-temperature, high-humidity industrial workshops in southern regions (summer temperatures can reach above 40℃). In the ultraviolet radiation test, after 168 hours of xenon lamp aging test, the insulation layer's tensile strength retention rate is ≥80% and the elongation at break retention rate is ≥70%, meeting the long-term outdoor exposure needs of solar power plants (with high annual ultraviolet radiation levels).

In terms of protection performance, the tensile strength of the steel wire armor layer is ≥1500MPa, and its impact resistance is such that there is no armor layer breakage or insulation layer damage under an impact energy of 10J. In terms of chemical corrosion resistance, after soaking the cable in 10% hydrochloric acid and 20% sodium hydroxide solutions for 72 hours, the insulation resistance change rate is ≤20%, making it suitable for environments with acidic water (pH 4-6) in underground mines or oil pollution and chemical solvents in industrial workshops. In addition, the cable's waterproof performance reaches IP67 level, with an insulation resistance of ≥100MΩ after short-term immersion (1m water depth for 24 hours), which can handle water accumulation scenarios in underground mines or during the rainy season in solar power plants.

In heavy industrial workshops such as metallurgical plants, machinery factories, and chemical plants, this cable can serve as a core power transmission carrier. In the steelmaking workshop of a metallurgical plant, the converter cooling water pump (power 150kW-200kW) in a high-temperature environment needs to withstand an ambient temperature of 40℃-60℃. The temperature resistance of the cable's XLPE insulation layer ensures stable power supply, and the steel wire armor layer can resist the impact of steel slag splashing and heavy object collisions in the workshop. The large machine tools (power 200kW-300kW) in machinery factories generate strong mechanical vibrations during operation. The multi-strand Stranded Conductor and armor structure of the cable can reduce the impact of vibrations on the conductor connection points, avoiding power failure faults caused by poor contact.

The power supply lines of reactors (power 100kW-150kW) in chemical plants need to resist acid and alkali vapor corrosion. The cable's XLPE insulation layer and steel wire armor layer (with hot-dip galvanized surface treatment) can effectively isolate corrosive media. At the same time, the flame-retardant filling material can prevent the spread of fire in case of reactor leakage. In addition, in the power distribution transformation projects of industrial plants, this cable can directly replace traditional PVC Insulated Cables without the need for additional protective sleeves, reducing transformation costs and adapting to the interfaces of existing distribution cabinets, shortening the construction period.

2. Scenario Adaptation in the Mining Field

In underground mining scenarios, this cable demonstrates strong environmental adaptability. In the excavation face, the roadway is narrow and rock friction is frequent. The steel wire armor layer can prevent insulation layer damage caused by the cable being scratched by rocks, and its impact resistance can handle the impact of roof falling rocks. The scraper conveyor (power 75kW-110kW) in the coal mining face moves frequently. The Flexibility of the cable (bending radius ≥12 times the cable outer diameter) can meet the line bending needs when the equipment moves, avoiding conductor breakage.

In the above-ground mineral processing plant of the mine, in areas where equipment such as ball mills (power 150kW-200kW) and flotation machines (power 50kW-80kW) are concentrated, the oil resistance of the cable can resist erosion from equipment lubricating oil. The 3-core/4-core structure enables centralized laying of power and control lines, reducing the space occupied by cable trays. In addition, in the mine Emergency Power Supply system, this cable can be used as the output line of a backup power source (such as a diesel generator with power above 200kW), quickly connecting to underground equipment and ensuring emergency operations in case of sudden power outages.

3. Precise Matching in the Solar Field

In solar photovoltaic power plants, this cable can cover the entire transmission chain from strings to the power grid. At the string level, 16mm²-25mm² cables are suitable for strings of 20-30 series-connected photovoltaic panels (total voltage 600V-1000V). The UV resistance of the XLPE insulation layer can handle long-term outdoor exposure, avoiding leakage risks caused by insulation layer aging. In the link from the combiner box to the inverter, 70mm²-120mm² cables can concentrate the current of multiple strings, meeting the input needs of 100kW-500kW inverters. The steel wire armor layer can protect the cable from mechanical rolling during power plant construction.

In the link from the inverter to the step-up station, 240mm²-400mm² cables can carry high-voltage (below 10kV) and high-current transmission, adapting to the input needs of step-up station transformers (capacity above 500kVA). In distributed photovoltaic scenarios, such as factory roof photovoltaic projects, the cable can be directly laid on roof brackets or wall surfaces. Its high and low temperature resistance can handle large day-night temperature differences (up to more than 30℃), and it has good compatibility with building exterior walls without affecting the building's appearance.

The conductor is made of high-purity electrolytic copper with a copper content of ≥99.95% and a resistivity of ≤0.017241Ω·mm²/m (at 20℃), which is much lower than the national standard (≤0.01777Ω·mm²/m), ensuring minimal power loss during current transmission. The conductor is processed using a "multi-pass wire drawing + bunching + stranding" process. Imported wire drawing oil is used during the wire drawing process to ensure the conductor surface is smooth and free of burrs, preventing the insulation layer from being punctured. A 1+6+12 layered bunching structure is adopted during bunching, which increases the conductor's flexibility by more than 30%. During stranding, the stranding pitch is controlled to be 12-16 times the conductor outer diameter, balancing flexibility and structural stability.

The insulation layer is made of high-quality XLPE material, with additives such as antioxidants and UV absorbers added. After cross-linking treatment, it forms a three-dimensional network structure. This material has a dielectric loss tangent value of ≤0.003 (at 100℃) and an insulation resistance of ≥10¹⁴Ω·cm, ensuring stable insulation performance under high voltage. At the same time, the XLPE material has excellent environmental stress cracking resistance, with no cracking after 1000 hours of damp heat testing, making it suitable for humid environments in underground mines. The steel wire armor layer is made of hot-dip galvanized high-carbon steel wire with a zinc layer thickness of ≥80μm. There is no red rust after a salt spray test (5% sodium chloride solution for 480 hours), demonstrating strong corrosion resistance. The steel wire diameter is matched to the cable specification: 1.2mm-1.6mm diameter steel wire for 16mm²-70mm² cables and 1.8mm-2.2mm diameter steel wire for 120mm²-400mm² cables, ensuring a balance between the armor layer strength and the overall flexibility of the cable.

The cable outer sheath is made of flame-retardant polyolefin material with an oxygen index of ≥32%, meeting the flame-retardant requirements of GB/T 18380.3-2008. In the vertical burning test, the flame spread height is ≤2.5m and the self-extinguishing time is ≤60 seconds. Clear product markings are printed on the outer sheath surface, including model, specification, manufacturer, production date, and other information. The marking's wear resistance is such that it remains clearly visible after 100 friction tests, facilitating later maintenance and identification.

2. Style and Installation Adaptation

According to different installation methods, the product offers a variety of style optimizations. For overhead installation scenarios, the cable adopts a "steel wire armor + lightweight outer sheath" design. The outer sheath thickness is reduced to 1.0mm-1.2mm, reducing the cable weight by 15% per meter compared to conventional styles, facilitating overhead installation. At the same time, the steel wire armor layer still maintains sufficient strength to resist mechanical fatigue caused by wind-induced swaying. For buried installation scenarios, a "double-layer steel wire armor + thickened outer sheath" design is adopted. The outer sheath thickness is increased to 2.0mm-2.5mm, and the armor layer uses a composite structure of spiral winding + interlocking armor, increasing soil pressure resistance by 50% and capable of withstanding a soil pressure of 30kN/m, avoiding damage from gravel extrusion during burial.

In underground mine mobile installation scenarios, the cable adopts a "Flexible Conductor + elastic outer sheath" design. The conductor stranding pitch is reduced to 8-10 times the outer diameter, and elastic material is added to the outer sheath. The bending radius can be reduced to 8 times the cable outer diameter, adapting to frequent bending when underground equipment moves. In solar power plant roof installation scenarios, UV-resistant additives are added to the cable outer sheath, and the surface adopts a corrugated design, increasing the heat dissipation area (heat dissipation efficiency is 20% higher than that of a smooth sheath) and avoiding cable overheating in the high-temperature roof environment.

Conductor production starts with high-purity electrolytic copper rods (diameter 8mm). First, continuous wire drawing machines are used for multi-pass wire drawing. The wire drawing machines adopt a frequency conversion speed control system, with a wire drawing speed of 8-12m/s. The area reduction rate of each wire drawing pass is controlled at 15%-20%, ensuring uniform conductor diameter and a surface roughness of ≤0.8μm. The drawn copper wires undergo annealing treatment in an annealing furnace with a nitrogen-protected atmosphere. The annealing temperature is 380℃-420℃, and the holding time is adjusted according to the copper wire diameter (30 minutes for 0.5mm-1.0mm copper wires and 45 minutes for 1.0mm-2.0mm copper wires). After annealing, the tensile strength of the copper wires is reduced to 200MPa-220MPa, and the elongation is increased to more than 30%, enhancing flexibility.

The annealed copper wires enter a bunching machine for bunching. The bunching machine adopts a 1+6+12+18 layered bunching method with a bunching speed of 6-8r/s. At the same time, a tension control system ensures uniform tension of each copper wire (deviation ≤5%), avoiding conductor eccentricity after bunching. After bunching, stranding is performed according to the cable core count: triangular stranding for 3-core cables and "3+1" circular stranding for 4-core cables. The stranding machine is equipped with an online diameter monitoring system to real-time monitor the conductor outer diameter (deviation controlled within ±0.1mm). After stranding, the conductor is cleaned of surface oil by an ultrasonic cleaner to ensure the adhesion of the subsequent insulation layer.

2. Insulation Extrusion Process

Three-layer co-extrusion equipment is used for insulation extrusion. The XLPE material (base resin + cross-linking agent + additives mixed in proportion) is heated to 180℃-200℃ for melting and extruded onto the conductor surface by a screw extruder (screw length-diameter ratio 25:1). During the extrusion process, an online insulation thickness monitoring system (accuracy ±0.01mm) is used to real-time control the insulation layer thickness. At the same time, a spark tester (voltage 15kV-25kV, adjusted according to insulation thickness) is used for online spark testing to ensure no pinholes, bubbles, or other defects in the insulation layer.

The extruded Insulated Wire cores enter a cross-linking tube for cross-linking treatment. The cross-linking tube uses a steam heating method, with a temperature of 220℃-240℃ and a pressure of 1.2MPa-1.5MPa. The cross-linking time is adjusted according to the insulation thickness (15 minutes for 0.8mm-1.2mm insulation layers and 25 minutes for 1.6mm-2.0mm insulation layers). After cross-linking, the insulated wire cores enter a cooling water tank for rapid cooling (water temperature 20℃-25℃), with a cooling rate controlled at 5℃/s to avoid internal stress in the insulation layer caused by uneven cooling.

3. Armoring and Sheathing Process

After the insulated wire cores are stranded, they enter the armoring process. For single-layer steel wire armoring, a spiral armoring machine is used. The armoring steel wires undergo pre-treatment (rust removal and anti-rust coating application), and the armoring pitch is controlled to be 12-15 times the steel wire diameter. At the same time, pressure rollers are used to tightly attach the steel wires to the cable core surface, ensuring the armor layer coverage rate is ≥90%. For double-layer steel wire armoring, inner-layer spiral armoring is first performed, followed by outer-layer interlocking armoring. During interlocking armoring, a meshed interlocking structure is adopted, with an interlocking depth of 1/3 of the steel wire diameter to ensure no gaps in the armor layer.

After armoring, the cable enters the sheathing extrusion process. A twin-screw extruder (screw length-diameter ratio 28:1) is used for sheathing extrusion. The extrusion temperature is adjusted according to the sheath material (160℃-180℃ for polyolefin materials), and the extrusion speed is synchronized with the cable traction speed (5-8m/min). The sheath thickness is ensured to be uniform (deviation ≤0.1mm) through mold design. After extrusion, the cable is cooled by spray cooling (water temperature 15℃-20℃). After cooling, it enters a laser coding machine for marking. The marking content is clear and wear-resistant, and finally, the cable is wound onto a dedicated cable drum (wooden or steel) by a traction machine. The winding tension is controlled at 500N-800N to avoid cable deformation.

4. Quality Inspection Process

Multiple quality inspection nodes are set up during the production process. After conductor manufacturing, conductor resistance (measured by a double-arm bridge with an accuracy of ±0.0001Ω), diameter (measured by a laser diameter gauge with an accuracy of ±0.001mm), and surface quality (observed under a microscope with 20x magnification) are inspected. After insulation extrusion, insulation thickness (measured by an ultrasonic thickness gauge), dielectric loss tangent value (measured by a dielectric loss tester at a frequency of 1kHz), and breakdown voltage (measured by a withstand voltage tester with a voltage rise rate of 1kV/s) are inspected.

After the armoring process, the armor layer adhesion (tested by a tensile testing machine with a test force of 500N-1000N, requiring adhesion ≥15N/cm) and impact resistance (tested by a drop weight impact tester with an impact energy of 10J) are inspected. After sheathing extrusion, the sheath thickness (measured by an ultrasonic thickness gauge), flame-retardant performance (tested by a vertical burning tester), and weather resistance (tested by a xenon lamp aging test chamber) are inspected. Sampling inspection is also conducted on finished cables, including overall DC resistance (≤0.017241Ω·mm²/m), insulation resistance (≥10¹⁴Ω·cm), and damp heat resistance (after 1000 hours at 40℃ and 95% relative humidity, insulation resistance ≥10¹³Ω·cm). All inspection data are recorded and archived to ensure traceability of the quality of each batch of products.

According to the cable specifications and lengths, different packaging methods are adopted. For cables with specifications of 16mm²-70mm² and lengths of 100m-500m, wooden cable drums are used for packaging. The cable drums have a diameter of 1.2m-1.5m and a width of 0.6m-0.8m, made of poplar plywood (18mm thick). The drum surfaces are reinforced with galvanized steel strips (30mm wide and 2mm thick) to prevent drum deformation during transportation. The cables are spirally wound on the drums, with a winding tension of 300N-500N. A layer of kraft paper is placed between each layer of winding to prevent friction between cable layers and avoid sheath scratches.

For cables with specifications of 120mm²-400mm² and lengths of 50m-200m, steel cable drums are used. The drums are made of 3mm-5mm thick cold-rolled steel plates, with a diameter of 1.8m-2.5m and a width of 1.0m-1.5m. The inner and outer surfaces of the drums are treated with anti-rust spray painting to prevent rusting during sea transportation or outdoor storage. The cable winding tension is controlled at 600N-800N, and a layer of foam plastic (5mm thick) is laid on the drum surface before winding to protect the cable sheath from direct contact with the steel drum and reduce impact during transportation.

For small-batch samples or short-length cables (length ≤50m), carton packaging is used. The cartons are made of five-layer corrugated paper with a compressive strength of ≥1500N/m². The cables are first coiled into circular coils (with a diameter 3-5 times the cable outer diameter) and wrapped with waterproof plastic film, then placed in the cartons. The gaps in the cartons are filled with bubble film to prevent the cables from moving during transportation. Each carton is labeled with clear product information, including model, specification, length, and batch number.

2. Customized Packaging Services

The factory provides customized packaging services according to customer requirements. For customers who need to transport cables to mining areas with harsh road conditions, reinforced wooden drums are used. The drum bodies are made of solid pine wood (30mm thick), and the drum heads are reinforced with steel plates (8mm thick) to enhance the drum's impact resistance and prevent damage caused by bumps during transportation.

For export customers, packaging that meets international transportation standards is provided. The wooden drums are treated in accordance with ISPM 15 (International Standards for Phytosanitary Measures No. 15), including heat treatment (heated to 56℃ for at least 30 minutes) or fumigation treatment (using methyl bromide fumigant), and marked with the ISPM 15 certification logo to avoid being detained by the customs of the destination country due to phytosanitary issues. In addition, the outer surfaces of the drums are wrapped with waterproof and moisture-proof plastic film (with a thickness of 0.15mm) and reinforced with steel belts (50mm wide and 3mm thick) to prevent the cables from getting damp during sea transportation and ensure the stability of the packaging.

For customers who need to store cables outdoors for a long time, anti-ultraviolet packaging is provided. The cable drums are wrapped with anti-ultraviolet plastic film (with a UV resistance level of UV3) and covered with sunshade cloth (with a sunshade rate of ≥95%) to prevent the cable sheaths from aging due to long-term ultraviolet radiation and extend the storage life of the cables.

The factory selects the appropriate transportation mode according to the customer's location, order quantity, and delivery time requirements. For domestic customers with a distance of ≤500km and a small order quantity (≤500m), road transportation is preferred. Light trucks (load capacity 5-10 tons) or medium trucks (load capacity 10-20 tons) are used, and the transportation time is generally 1-3 days, which is flexible and can realize door-to-door delivery. For example, customers in the same province can receive the goods within 24 hours, ensuring the timeliness of emergency maintenance projects.

For domestic customers with a distance of >500km and a large order quantity (≥1000m), railway transportation is selected. Railway freight cars (such as gondola cars or covered cars) are used, with a large transportation capacity (a single gondola car can load 20-30 steel cable drums) and low transportation costs (20%-30% lower than road transportation). The transportation time is generally 3-7 days, which is suitable for large-scale industrial or mining project procurement. The factory coordinates with the railway department to book the freight cars in advance and arranges for the loading and unloading of the cable drums at the railway station.

For export customers, sea transportation is the main mode. Container ships (20-foot or 40-foot containers) are used. A 20-foot container can load 8-12 steel cable drums (120mm²-240mm² specifications), and a 40-foot container can load 15-20 steel cable drums. The transportation cost is low (30%-50% lower than air transportation), and it can carry large quantities of goods. The transportation time depends on the destination port, generally 15-30 days for nearby countries (such as Southeast Asian countries) and 30-60 days for distant countries (such as European and American countries). For customers with urgent needs (such as emergency replacement of mining cables), air transportation is provided. Air freight is used, with a transportation time of 3-7 days, but the cost is higher (5-10 times that of sea transportation), and it is only suitable for small-batch urgent orders (≤100m).

2. Loading and Unloading Specifications

Strict loading and unloading specifications are formulated to ensure the safety of the cables during transportation. Before loading, the transportation vehicles or ships' cargo holds are inspected to ensure they are clean, dry, and free of sharp objects (such as nails or iron chips) that may scratch the cable sheaths. For road transportation trucks, wooden pads (50mm thick) are laid on the truck beds to reduce the impact of road bumps on the cable drums.

When loading the cable drums, professional lifting equipment (such as cranes or forklifts) is used. The lifting points are located at the two ends of the drum's central axis to ensure the drum is lifted horizontally and avoid tilting. The lifting speed is controlled at 0.5-1m/s to prevent the drum from swinging and colliding with other objects. When placing the drums on the transportation vehicles or cargo holds, they are placed vertically (the drum heads are perpendicular to the ground), and the distance between adjacent drums is ≥10cm to facilitate heat dissipation and avoid mutual friction. For multiple layers of stacked drums (only allowed for steel drums), the number of layers is not more than 2, and a layer of rubber pads (10mm thick) is placed between the layers to reduce pressure on the lower drums.

When unloading, the same professional lifting equipment is used, and the unloading speed is controlled at 0.3-0.8m/s. It is strictly forbidden to roll the drums directly on the ground, as this may damage the drum structure and the cable sheaths. After unloading, the drums are placed in a flat, dry, and well-ventilated area, and the distance between the drums and the ground is ≥10cm (using wooden blocks or steel brackets for support) to prevent the drums from getting damp.

3. Transportation Monitoring and Protection

The factory has established a complete transportation monitoring system to track the entire transportation process in real time. For road transportation, GPS positioning devices are installed on the trucks, and the logistics management department can monitor the trucks' location, speed, and driving route through the logistics management platform. If the trucks deviate from the planned route, exceed the speed limit (highway speed limit ≤80km/h, national road speed limit ≤60km/h), or stop for an abnormal time (≥2 hours without reason), the system will send an alarm, and the logistics staff will contact the driver immediately to confirm the situation and handle it properly.

For railway transportation, the factory cooperates with the railway department to obtain the train's schedule, departure time, and arrival time in a timely manner, and updates the customer on the transportation progress every 24 hours. For sea transportation, the factory tracks the ship's navigation status through the ship's AIS (Automatic Identification System), understands the sea conditions and the estimated arrival time at the port, and notifies the customer of the bill of lading number and port of arrival 3-5 days in advance to facilitate the customer's customs clearance and pick-up.

During transportation, if unexpected situations occur (such as traffic accidents, natural disasters, or port delays), the factory will immediately formulate an emergency plan. For example, if a truck is involved in an accident and the cables are damaged, the factory will arrange for a backup truck and replace the damaged cables within 24 hours to ensure the customer's project progress is not affected. If the ship is delayed due to bad weather, the factory will communicate with the customer in a timely manner, provide the latest transportation schedule, and compensate the customer for the losses caused by the delay in accordance with the contract agreement.

After receiving the customer's order, the sales department first confirms the order details with the customer, including cable model, specification (core count, cross-sectional area), length, quantity, delivery time, destination, and packaging requirements. The confirmation is conducted in writing (such as email or contract) to avoid misunderstandings caused by verbal communication. After the customer confirms the details, the sales department issues a formal sales contract, which clearly stipulates the rights and obligations of both parties, including product quality standards, delivery terms, payment terms, and after-sales service commitments. The contract takes effect after both parties sign and seal it.

The confirmed order is transferred to the production planning department, which formulates a detailed production schedule based on the factory's production capacity, raw material inventory, and customer's delivery time requirements. The production schedule specifies the start and end times of each production link (conductor manufacturing, insulation extrusion, armoring, sheathing, and quality inspection) and the responsible workshop. For example, for an order of 1000m 240mm² 4-core cables with a delivery time of 15 days, the production schedule will arrange 3 days for conductor manufacturing, 4 days for insulation extrusion, 3 days for armoring, 2 days for sheathing, and 2 days for quality inspection and packaging, with 1 day reserved as a buffer for unexpected situations.

The production planning department also coordinates with the purchasing department to ensure the timely supply of raw materials. For example, if the order requires high-purity electrolytic copper rods, the purchasing department will contact the designated supplier to confirm the delivery time and quantity, and track the raw material transportation progress to avoid production delays due to raw material shortages.

2. Pre-Shipment Inspection and Document Preparation

Before shipment, the quality control department conducts a comprehensive pre-shipment inspection of the finished cables. The inspection items include product appearance (checking whether the cable sheaths are smooth, free of cracks, bubbles, or scratches), dimensions (measuring the cable outer diameter, insulation thickness, and sheath thickness), electrical performance (testing the conductor resistance, insulation resistance, and dielectric strength), and mechanical performance (testing the armor layer adhesion and impact resistance). The inspection ratio is 100% for appearance and dimensions, and 5% for electrical and mechanical performance (sampling from each batch). Only after all inspection items pass can the cables be shipped.

At the same time, the logistics department prepares the necessary shipping documents. For domestic shipments, the documents include a commercial invoice (stating the product name, model, specification, quantity, unit price, total amount, and payment terms), a packing list (detailing the package number, product specifications, length, and gross weight/net weight), and a quality certificate (issued by the quality control department, proving that the products meet the relevant standards). For export shipments, additional documents are required, including a customs declaration form (filled in according to the customs regulations of the destination country), a certificate of origin (proving the country of origin of the products, which can help customers enjoy preferential tariffs), and an inspection and quarantine certificate (for products that require phytosanitary or safety inspection, such as wooden cable drums).

The documents are prepared in both Chinese and English (or the official language of the destination country) to facilitate customs clearance and customer acceptance. The logistics department checks the documents carefully to ensure there are no errors or omissions, such as inconsistent product specifications on the invoice and packing list, or missing signatures on the quality certificate.

3. Shipment Arrangement and Notification

After the pre-shipment inspection is completed and the documents are prepared, the logistics department arranges the shipment according to the agreed transportation mode. For road transportation, the logistics department contacts the cooperative trucking company to dispatch the appropriate type of truck and arranges for the driver to arrive at the factory on time for loading. The loading time is usually scheduled during the day (9:00-17:00) to ensure sufficient light and safe operation. After loading, the driver signs the delivery note, and the logistics department sends the delivery note, truck number, driver's contact information, and estimated arrival time to the customer via email or SMS.

For railway transportation, the logistics department coordinates with the railway station to confirm the loading date and platform, and arranges for the cable drums to be transported to the railway station by trucks. After the drums are loaded onto the train, the railway station issues a waybill, and the logistics department sends the waybill number, train number, and estimated arrival time at the destination station to the customer. For sea transportation, the logistics department delivers the cable drums to the port warehouse, and after the customs clearance is completed, the drums are loaded onto the container ship. The shipping company issues a bill of lading, and the logistics department sends the bill of lading, container number, and estimated arrival time at the destination port to the customer.

During the shipment process, the logistics department keeps in close contact with the carrier and the customer, and updates the customer on the shipment progress every 2-3 days. For example, for sea transportation, the logistics department notifies the customer when the ship departs, when it arrives at the transshipment port (if any), and when it is about to arrive at the destination port. After the goods arrive at the destination, the logistics department coordinates with the carrier to notify the customer to pick up the goods. If door-to-door delivery is agreed, the local cooperative logistics team will be arranged to complete the last-mile delivery. Before delivery, the customer is asked to inspect the outer packaging of the goods. If there is no damage to the packaging, the customer signs for acceptance; if there is damage to the packaging, the customer is invited to inspect the cable inside the package together with the logistics staff. If the cable is damaged, the damage is recorded in writing, and the factory is notified in a timely manner to handle the after-sales problem. After the customer confirms the acceptance of the goods, the logistics department collates the delivery documents and customer acceptance certificates and submits them to the sales and finance departments for filing, which serves as the basis for subsequent settlement and after-sales service.

The factory provides professional sample customization services to help customers verify product performance and adaptability before placing large orders. When a customer needs a sample, the sales engineer first communicates with the customer in detail to confirm sample requirements, including core count (3-core or 4-core), cross-sectional area (16mm²-400mm²), insulation and sheath material specifications, length (usually 1m-5m, adjustable according to customer test needs), and special performance requirements (such as enhanced flame retardancy, anti-rodent and ant properties). For solar power plant customers, samples can also be customized with anti-ultraviolet markers on the sheath to facilitate outdoor exposure tests.

After confirming the sample requirements, the sales department issues a "sample production order" and transfers it to the technical department and production workshop. The technical department designs the sample production process based on the requirements, such as adjusting the stranding pitch of the conductor for flexible samples or increasing the thickness of the armor layer for samples used in harsh mining environments. The production workshop arranges a dedicated team to produce samples, using the same raw materials and production equipment as formal products to ensure that the samples are consistent with the formal products in terms of performance and appearance. For example, the conductor of the sample uses the same high-purity electrolytic copper as the formal product, and the insulation layer uses the same XLPE material, ensuring that the sample's conductive performance and insulation performance are consistent with the formal product.

After the sample production is completed, the quality control department conducts a comprehensive inspection in accordance with the "sample inspection standard". The inspection items include: appearance inspection (checking whether the sample's sheath is smooth, whether the marking is clear, and whether there are defects such as bubbles and scratches), dimensional inspection (measuring the sample's outer diameter, insulation thickness, and armor layer thickness), electrical performance inspection (testing the sample's conductor resistance, insulation resistance, and dielectric strength), and mechanical performance inspection (testing the sample's bending resistance and armor layer adhesion). For samples with special requirements, additional tests are conducted, such as a flame retardant test for flame-retardant samples (in accordance with GB/T 18380.3-2008) and an ultraviolet aging test for solar samples (168 hours of xenon lamp irradiation).

Only after all inspection items pass can the sample be packaged and delivered. The sample packaging uses a small carton (20cm×15cm×10cm) made of three-layer corrugated paper, with a layer of bubble film inside to protect the sample from damage during transportation. The carton is labeled with the customer's name, sample specifications, production date, and batch number. The delivery method of the sample is determined according to the customer's location and urgency: for domestic customers, express delivery (such as SF Express, ZTO Express) is used, with a delivery time of 1-3 days; for international customers, international express (such as DHL, FedEx) is used, with a delivery time of 3-7 days. The factory usually bears the sample production cost, and the express cost can be negotiated with the customer or borne by the factory for long-term cooperative customers.

After the customer receives the sample, the sales engineer takes the initiative to follow up within 3-5 days to understand the customer's test progress and feedback. If the customer is satisfied with the sample performance, the sales engineer introduces the formal order process, delivery cycle, and preferential policies to the customer, and assists the customer in formulating a procurement plan. If the customer has questions about the sample, such as unqualified insulation resistance test results or insufficient flexibility, the sales engineer immediately forwards the feedback to the technical department and quality control department. The technical department analyzes the cause of the problem, such as whether the insulation layer is not fully cross-linked or the conductor stranding pitch is too large, and provides a solution within 24 hours, such as re-producing the sample or adjusting the production process.

After the problem is solved, the re-produced sample is sent to the customer for re-testing, and the sales engineer continues to follow up until the customer is satisfied. The factory records all sample feedback and solutions in the "sample feedback database" to provide a basis for optimizing product design and production processes. For example, if multiple customers reflect that the 400mm² 4-core sample has poor flexibility, the technical department will optimize the conductor stranding process, reduce the stranding pitch, and improve the sample's flexibility.

The factory provides professional installation guidance services to ensure that customers can correctly install and use the cables, avoiding safety accidents caused by incorrect installation. Before the customer installs the cable, the after-sales engineer sends the "cable installation manual" to the customer, which details the installation preparation (tools, materials, site requirements), installation steps (unwinding, laying, connection, fixing), and precautions (avoiding excessive bending, preventing mechanical damage, and ensuring correct grounding). The manual is equipped with 3D installation diagrams and operation videos, which are easy for the installation team to understand and operate.

During the installation process, if the customer encounters problems, such as difficulty in laying the cable in narrow mine roadways or unclear connection methods of the cable to the inverter, the customer can contact the after-sales hotline (available 24 hours a day) or communicate with the after-sales engineer via video call. The after-sales engineer provides real-time guidance, such as recommending the use of a cable traction machine for laying in narrow roadways or demonstrating the correct connection method of the cable terminal. For large-scale projects (such as solar power plants with an installed capacity of more than 100MW or large mining areas), the factory can send after-sales engineers to the site for on-site guidance. The on-site engineer checks the installation site in advance, formulates an installation plan with the customer's installation team, and supervises the installation process to ensure that the installation meets the technical requirements. For example, in the installation of underground mine cables, the on-site engineer checks whether the cable laying path is away from high-temperature equipment and sharp rocks, and whether the armor layer is damaged during laying.

The factory adheres to the principle of "customer first" and provides efficient quality problem handling services. If the customer finds quality problems with the cable during use (such as insulation layer breakdown, armor layer corrosion, or abnormal heating), the customer can report the problem to the after-sales department by phone, email, or the factory's after-sales platform, and provide relevant information, such as the product batch number, installation location, problem description, and photos or videos of the problem.

After receiving the problem report, the after-sales department records the information and assigns a dedicated after-sales engineer to handle the problem within 2 hours. The after-sales engineer first communicates with the customer to understand the details of the problem, such as the time when the problem occurred, the operating environment of the cable, and whether there are external factors (such as mechanical impact or chemical corrosion). Then, the after-sales engineer checks the product's production and inspection records to understand the quality status of the product during production. If necessary, the factory sends a technical team to the site to inspect the problem cable, collect samples for testing, and analyze the cause of the problem.

Based on the cause analysis results, the factory formulates a solution and communicates it with the customer. If the problem is caused by product quality (such as unqualified Insulation Material), the factory provides three solutions for the customer to choose from: replacing the unqualified cable for free, repairing the damaged part of the cable, or compensating the customer according to the loss. The replacement cable is produced and delivered within 3-7 days (depending on the specification and quantity), and the factory arranges for personnel to recycle the unqualified cable to avoid secondary use. If the problem is caused by incorrect installation or use (such as excessive bending of the cable), the after-sales engineer provides correct installation and use guidance to the customer, and assists the customer in repairing the cable if necessary.

After the problem is solved, the after-sales department follows up with the customer within 1 month to confirm whether the problem is completely solved and whether the cable operates normally. The factory records all quality problems and handling processes in the "quality problem database" and conducts a monthly analysis to find out the root causes of frequent problems and take improvement measures. For example, if multiple quality problems are caused by unqualified insulation materials, the purchasing department will re-evaluate the supplier of insulation materials and increase the frequency of raw material inspection.

For long-term cooperative customers (such as large industrial enterprises and mining groups), the factory provides regular maintenance services to extend the service life of the cable and ensure the stable operation of the customer's power supply system. The maintenance cycle is determined according to the use environment of the cable: for cables used in harsh environments (such as underground mines and outdoor solar power plants), the maintenance cycle is 6 months; for cables used in general industrial workshops, the maintenance cycle is 1 year.

Before the maintenance, the after-sales department sends a "maintenance notice" to the customer, specifying the maintenance time, content, and required cooperation from the customer. The maintenance team consists of after-sales engineers and technical personnel, equipped with professional testing equipment, such as a cable fault tester, insulation resistance tester, and temperature measuring instrument. The maintenance content includes: on-site inspection (checking whether the cable's sheath is damaged, whether the connection point is loose or corroded, and whether the armor layer is rusted), performance testing (testing the cable's insulation resistance, conductor resistance, and surface temperature), and cleaning and maintenance (cleaning the surface dirt of the cable, tightening the loose connection point, and applying anti-rust paint to the armor layer).

After the maintenance is completed, the maintenance team issues a "maintenance report" to the customer, which includes the maintenance results, existing problems, and improvement suggestions. For example, if the maintenance finds that the insulation resistance of a section of cable in the mine is lower than the standard value, the report suggests replacing the cable in time to avoid insulation breakdown; if the surface temperature of the cable in the solar power plant is too high, the report suggests increasing the distance between the cables to improve heat dissipation. The factory also provides cable life assessment services for customers, predicting the remaining service life of the cable based on the maintenance results and the use environment, and formulating a replacement plan for the customer to avoid sudden cable failure affecting the production and operation of the customer.

The factory has established a spare parts warehouse in major industrial and mining areas and solar power plant concentration areas to provide timely spare parts supply services. The spare parts mainly include cable terminals, connectors, insulation sleeves, and armor layer repair materials, which are suitable for various specifications of 3-core and 4-core cables. When a customer needs spare parts, they can contact the local spare parts warehouse or the after-sales department, and the spare parts can be delivered within 24 hours for local customers and 3-5 days for non-local customers. The factory provides technical guidance for the installation and use of spare parts, ensuring that customers can correctly use the spare parts to repair the cable.

In case of emergency situations (such as cable damage caused by mine roof collapse or solar power plant cable failure due to severe weather), the factory provides 24-hour emergency support services. The customer can call the emergency hotline, and the after-sales department will arrange an emergency team to rush to the site within the shortest time (2-4 hours for nearby areas and 8-12 hours for distant areas). The emergency team is equipped with emergency repair equipment and spare cables to quickly repair or replace the damaged cable, restoring the power supply as soon as possible. For example, if a mine's main power cable is damaged due to a roof collapse, the emergency team can use a cable fault locator to quickly find the fault point, cut off the damaged section, and connect the spare cable to restore power supply within 6 hours, minimizing the loss caused by power outage to the mine.

In summary, the 3-core 4-core Armored Copper Wire XLPE insulated steel wire armored solar power cable for industrial mining integrates excellent performance, diverse specifications, and thoughtful services. From product design and production to packaging, transportation, sample supply, and after-sales service, the factory adheres to the concept of "quality first, customer satisfaction" to provide customers with comprehensive solutions. Whether it is in the harsh underground mining environment, the high-temperature and high-humidity industrial workshop, or the outdoor solar power plant exposed to wind and sun, this cable can provide stable and reliable power transmission support, and the perfect after-sales service system further ensures the smooth operation of the customer's power supply system, creating greater value for the customer's production and development.