The specification parameters of 4-core (4c) copper-aluminum Power Cables are the basis for their performance and applications. Cables with different cross-sectional areas have obvious differences in various parameters, which directly determine their applicable scenarios and price ranges.

The cross-sectional areas of 4c copper-Aluminum Power Cables cover multiple specifications such as 4mm², 10mm², 16mm², 25mm², 35mm², 70mm², 95mm², and 185mm². For Copper Cables, the diameter of a 4mm² Copper Conductor is approximately 2.25mm, with a rated current-carrying capacity of about 30A when laid in air and about 35A when laid in soil; a 10mm² copper conductor has a diameter of about 3.58mm, with a current-carrying capacity of about 55A in air and 65A in soil; a 16mm² copper conductor has a diameter of about 4.5mm, with a current-carrying capacity of about 70A in air and 85A in soil; a 25mm² copper conductor has a diameter of about 5.6mm, with a current-carrying capacity of about 95A in air and 115A in soil; a 35mm² copper conductor has a diameter of about 6.8mm, with a current-carrying capacity of about 120A in air and 145A in soil; a 70mm² copper conductor has a diameter of about 10.0mm, with a current-carrying capacity of about 190A in air and 230A in soil; a 95mm² copper conductor has a diameter of about 11.6mm, with a current-carrying capacity of about 230A in air and 280A in soil; a 185mm² copper conductor has a diameter of about 16.0mm, with a current-carrying capacity of about 340A in air and 410A in soil.

The parameters of Aluminum Cables are different from those of Copper Cables. Due to the slightly inferior conductivity of aluminum compared to copper, the current-carrying capacity of Aluminum Cables is about 15%-20% lower than that of copper cables with the same cross-sectional area. A 4mm² Aluminum Conductor has a diameter of about 2.5mm, with a current-carrying capacity of about 25A in air and 30A in soil; a 10mm² aluminum conductor has a diameter of about 3.9mm, with a current-carrying capacity of about 45A in air and 55A in soil; a 16mm² aluminum conductor has a diameter of about 4.9mm, with a current-carrying capacity of about 60A in air and 70A in soil; a 25mm² aluminum conductor has a diameter of about 6.1mm, with a current-carrying capacity of about 80A in air and 95A in soil; a 35mm² aluminum conductor has a diameter of about 7.3mm, with a current-carrying capacity of about 100A in air and 120A in soil; a 70mm² aluminum conductor has a diameter of about 10.8mm, with a current-carrying capacity of about 160A in air and 190A in soil; a 95mm² aluminum conductor has a diameter of about 12.4mm, with a current-carrying capacity of about 190A in air and 230A in soil; a 185mm² aluminum conductor has a diameter of about 17.0mm, with a current-carrying capacity of about 280A in air and 340A in soil.

In addition to cross-sectional area and current-carrying capacity, the thickness of the cable's insulation layer is also an important specification parameter. The insulation layer thickness of 4mm²-10mm² cables is usually 0.8mm-1.0mm; that of 16mm²-35mm² cables is about 1.0mm-1.2mm; and that of 70mm²-185mm² cables is 1.2mm-1.4mm. The insulation layer materials are mostly polyvinyl chloride (PVC) or cross-linked polyethylene (XLPE). Among them, the XLPE insulation layer has better temperature resistance and can work for a long time in an environment of 90℃, while the temperature resistance of the PVC Insulation layer is usually 70℃.

The outer diameter of the cable also increases with the increase of the cross-sectional area. The outer diameter of a 4mm² copper cable is about 10mm-12mm, and that of a 185mm² copper cable can reach 40mm-45mm; due to the slightly larger conductor diameter of aluminum cables, the outer diameter of aluminum cables with the same cross-sectional area is about 5%-10% larger than that of copper cables.

4c copper-Aluminum Power Cables have unique application scenarios in various fields due to their different specification parameters and performance characteristics.

Copper and aluminum cables with 4mm² and 10mm² cross-sectional areas have relatively low current-carrying capacity due to their small cross-sectional areas, and are suitable for low-voltage power distribution systems such as lighting and sockets in homes and small commercial places. For example, in home decoration, 4mm² copper cables can be used to connect high-power household appliances such as air conditioners and electric water heaters, and 10mm² copper cables can be used as incoming lines; aluminum cables can be used for some temporary power supply lines or small shops sensitive to cost.

Cables with 16mm² and 25mm² cross-sectional areas have moderate current-carrying capacity and are widely used in power distribution systems of small and medium-sized industrial equipment and office buildings. In factories, they can be used to connect small and medium-sized mechanical equipment such as lathes and milling machines; in office buildings, they can be used as floor power distribution trunks to supply power to electrical equipment in various offices. In addition, these two specifications of cables are also commonly used for power supply of outdoor small billboards, street lamps and other facilities.

Cables with 35mm² and 70mm² cross-sectional areas have large current-carrying capacity and are suitable for scenarios such as workshop power distribution in large industrial enterprises and main power distribution trunks in high-rise buildings. For example, in the workshops of steel mills and machinery factories, they can be used to connect high-power equipment such as large stamping equipment and furnaces; in high-rise buildings, 35mm² and 70mm² copper cables can be used as vertical power distribution trunks to transmit power from the bottom distribution room to various floors.

Large cross-sectional area cables with 95mm² and 185mm² are mainly used in power transmission and distribution lines of power systems, large substations, large energy projects, etc. In urban power grid transformation, 95mm² cables can be used for branch power transmission, and 185mm² cables can be used as main trunks to transmit power from power plants or substations to various regions; in large energy projects such as wind farms and solar Power Stations, these cables can be used to transmit electrical energy from generator sets to collection boxes and then to the power grid.

From the perspective of materials, copper cables, due to their good conductivity and stable mechanical properties, are more suitable for scenarios with high requirements for power transmission quality and safety, such as hospitals, data centers, and precision instrument manufacturing factories. In these places, any power failure may cause serious consequences, and copper cables can provide more reliable power protection.

Aluminum cables, due to their advantage of low cost, are widely used in some scenarios that are cost-sensitive and do not have particularly high requirements for conductivity, such as outdoor high-voltage transmission lines, rural power grid transformation, and temporary construction sites. In these scenarios, aluminum cables can greatly reduce project costs while meeting basic power transmission needs.

The material and style design of 4c copper-aluminum power cables directly affect their performance, price, and applicable scenarios.

In terms of Conductor Materials, copper cables use high-purity electrolytic copper as conductors, with a purity usually above 99.95%. High-purity copper has excellent conductivity, with a conductivity of about 58MS/m, which can reduce losses during current transmission. At the same time, it has good ductility and mechanical strength, making it easy to process and lay. The surface of the copper conductor is usually annealed to eliminate internal stress generated during processing and improve its Flexibility.

The conductors of aluminum cables use high-purity aluminum, with a purity generally above 99.5%. The conductivity of aluminum is about 37MS/m, which is lower than that of copper, but its price is only about one-third of that of copper, having an obvious cost advantage. In order to improve the mechanical properties and connection performance of aluminum, some aluminum cables use Aluminum Alloy Conductors. By adding elements such as magnesium and silicon, their tensile strength and corrosion resistance are improved.

The insulation layer materials mainly include polyvinyl chloride (PVC) and cross-linked polyethylene (XLPE). The PVC insulation layer has good insulation performance, Chemical Resistance, and processing performance, and is low in price, but has poor temperature resistance, with a long-term working temperature of 70℃, and releases toxic gases when burned. The XLPE insulation layer forms a three-dimensional network structure through chemical or physical methods to cross-link polyethylene molecules, having excellent temperature resistance (long-term working temperature of 90℃), aging resistance, and electrical performance. It does not release toxic gases when burned, so it is safer, but the cost is relatively higher.

Cables have various styles, which can be divided into ordinary type, flame-retardant type (Zr), armored type (such as YJV22), etc., according to different combinations of insulation layers and sheaths. Ordinary cables are composed of conductors, insulation layers, and sheaths. The sheath is usually made of PVC material, suitable for general environments. Flame-retardant cables have flame retardants added to the insulation layer and sheath materials, which can inhibit the spread of flames during open fire burning, with a short self-extinguishing time, suitable for places with high fire protection requirements such as densely populated places and high-rise buildings. Armored Cables have an additional layer of Steel Tape or steel wire armoring outside the insulation layer, which can improve the mechanical strength and impact resistance of the cable, prevent gnawing by creatures such as rats and termites, and are suitable for environments vulnerable to external damage such as direct burial and pipe threading.

In addition, the color of the cable is also part of its style. Common colors include black, gray, white, etc. Cables of different colors can be used to distinguish different uses or phases, facilitating construction and maintenance.

The production process of 4c copper-aluminum power cables is complex, involving multiple links, and the process control of each link has an important impact on the quality and performance of the cable.

The production process of Copper Conductors first involves melting electrolytic copper ingots and drawing them into copper rods, then drawing the copper rods into Copper Wires of the required diameter through a continuous drawing process. During the drawing process, it is necessary to control the drawing speed, tension, and mold size to ensure the diameter accuracy and surface quality of the copper wires. The drawn copper wires need to be annealed, heating the copper wires to a certain temperature (usually 300℃-500℃) and then slowly cooling them to eliminate internal stress and improve the flexibility and conductivity of the copper wires. Finally, multiple copper wires are stranded together to form a conductor. The stranding process can improve the flexibility and mechanical strength of the conductor. During stranding, it is necessary to control the stranding pitch and tension to ensure that the conductor structure is tight and round.

The production of Aluminum Conductors is similar to that of copper conductors, but due to the inferior ductility of aluminum compared to copper, more care is needed during the drawing and stranding processes. First, aluminum ingots are melted and cast into aluminum rods, then drawn into Aluminum Wires. The drawing speed and tension are lower than those for copper wires. Aluminum Wires usually do not require annealing, but for some high-demand Aluminum Alloy Conductors, special heat treatment may be required. The stranding process of aluminum wires is basically the same as that of copper wires, but due to the low strength of aluminum, care must be taken to avoid excessive stretching.

The extrusion of the insulation layer is one of the key links in cable production. For the PVC insulation layer, first, PVC resin is mixed uniformly with plasticizers, stabilizers, lubricants, and other additives, then the mixture is heated and melted and extruded onto the surface of the conductor through an extruder. During the extrusion process, it is necessary to control the extrusion temperature (usually 150℃-180℃), extrusion speed, and mold size to ensure that the insulation layer has uniform thickness, a smooth surface, and no defects such as bubbles and impurities.

For the XLPE insulation layer, the production process is relatively complex. First, polyethylene resin is mixed with cross-linking agents, antioxidants, and other additives, then extruded onto the surface of the conductor through an extruder to form an insulation layer, which is in an uncross-linked state at this time. Next, the insulation layer needs to be cross-linked. Common cross-linking methods include chemical cross-linking and irradiation cross-linking. Chemical cross-linking involves placing the extruded cable in a steam pipe or vulcanizing tank, where the cross-linking agent decomposes under high temperature and pressure to initiate cross-linking of polyethylene molecules; irradiation cross-linking uses high-energy electron beams generated by an electron accelerator to irradiate the insulation layer, causing cross-linking reactions of polyethylene molecules. The cross-linked insulation layer needs to be cooled to fix its structure.

The production process of the sheath is similar to that of the insulation layer. For the PVC Sheath, PVC materials are mixed with additives and then extruded onto the insulation layer or armored layer through an extruder; for sheaths of other materials, such as polyethylene sheaths, the production process is basically the same. During the sheath extrusion process, it is necessary to ensure that the sheath is tightly combined with the inner structure, with uniform thickness and a smooth surface.

For armored cables, armoring treatment is required before sheath extrusion. Steel tape armoring involves wrapping cold-rolled steel tape around the insulation layer through an armoring machine at a certain angle. During wrapping, it is necessary to control the wrapping angle and tension to ensure that the steel tapes are tightly interlocked to form a continuous armored layer; steel wire armoring involves winding steel wires around the insulation layer, suitable for scenarios that need to withstand large tensile forces.

Throughout the production process, multiple quality inspections of the cable are required, such as conductor resistance testing, insulation resistance testing, voltage resistance testing, mechanical performance testing, etc., to ensure that the product quality meets the requirements of relevant standards.

The packaging design of 4c copper-aluminum power cables aims to protect the cables from damage during transportation, storage, and handling, while facilitating customer identification and use.

For small cross-sectional area cables (such as 4mm², 10mm²), they are usually packaged in coils or reels. When coiled, wooden or plastic reels are used. The diameter of the reel depends on the length of the cable, generally 300mm-600mm. After the cable is wound on the reel, it is wrapped with plastic film and fixed with packing tape to prevent the cable from loosening. Reeling involves rolling the cable into a circle and wrapping it with a layer of linen or woven bag, suitable for shorter lengths of cable.

Medium and large cross-sectional area cables (such as 16mm² and above) are mainly packaged with wooden reels. The reel diameter is large, usually 800mm-2000mm, to accommodate longer cable lengths. The cable is tightly wound on the reel, covered with plastic film, and baffles are installed on both sides of the reel. The baffles are marked with the cable's model, specification, length, weight, manufacturer, production date, and other information, facilitating customer acceptance. For export cables, the reels usually use fumigated wood to meet international quarantine requirements.

In addition, each packaging unit is equipped with product certificates, test reports, and other documents, which detail the various performance indicators and quality inspection results of the cable, providing quality assurance for customers. For some cables with special requirements, such as flame-retardant and armored cables, corresponding marks are also placed on the packaging to distinguish them from ordinary cables.

During storage, packaged cables should be stored in a dry, ventilated, and cool warehouse, avoiding direct sunlight, rain, and moisture, and kept away from fire sources and corrosive substances. Cables should be placed horizontally or vertically, avoiding excessive stacking to prevent reel deformation or cable damage due to pressure.

The transportation of 4c copper-aluminum power cables requires consideration of multiple factors to ensure that the cables are safe and intact during transportation.

In terms of transportation mode selection, small batches and short-distance transportation can use road transportation, such as trucks and vans; large batches and long-distance transportation can choose railway transportation or sea transportation. Road transportation has high flexibility and can directly deliver cables to the destination, but the transportation cost is relatively high; railway transportation is suitable for large quantities of goods, with low cost, but requires loading and unloading at railway stations; sea transportation is mainly used for export cables, with low transportation cost, but long transportation time, and attention must be paid to moisture and corrosion prevention.

During transportation, the loading and fixing of cables are crucial. For coiled cables, the reels should be placed stably on the transport vehicle, and the reels should be fixed firmly with ropes or chains to prevent the reels from moving or sliding

due to bumps or turns during transportation. Cables should be prevented from squeezing and colliding with each other to avoid damage to the insulation layer and sheath. For reeled cables, they should be stacked neatly and separated by wooden boards or partitions to avoid mutual friction.

During transportation, attention should also be paid to protecting the cables from the impact of the external environment. When transporting in rainy or humid weather, the cables should be covered with a tarpaulin to prevent moisture; when transporting in high-temperature weather, the cables should be avoided from being exposed to sunlight for a long time to prevent aging of the insulation layer. In addition, transport vehicles should abide by traffic rules, avoid sudden braking, sharp turns and other operations to reduce the impact on the cables.

For internationally transported cables, relevant transportation procedures and customs declaration documents need to be handled, such as bills of lading, packing lists, commercial invoices, certificates of origin, etc. At the same time, it is necessary to understand the relevant standards and regulations of the destination country or region to ensure that the cables meet the local import requirements.

Transportation records should be kept during transportation, including transportation time, route, weather conditions, quantity and status of cables, etc., so that problems can be traced and handled in a timely manner when they occur.

The delivery process of 4c copper-aluminum power cables is rigorous and standardized to ensure that customers can receive the required products in a timely and accurate manner.

After the customer places an order, the sales staff will communicate with the warehouse department in a timely manner to verify the product inventory. If there is stock, the warehouse department will prepare the goods according to the order requirements, carefully check the model, specification, length, quantity, etc. of the cables to ensure consistency with the order. If there is no stock, the sales staff will coordinate with the production department to arrange the production plan, clarify the delivery time, and timely feedback to the customer.

After the goods are prepared, the quality inspection department will re-inspect the cables to check whether the appearance, packaging, marks and various performance indicators of the cables meet the requirements, and only qualified products can be shipped. After passing the inspection, the warehouse staff will package the cables according to the customer's required packaging method and attach relevant documents such as product certificates and test reports.

Before delivery, the sales staff will confirm the delivery information with the customer, such as delivery address, consignee, contact number, transportation method, etc., to ensure that the information is accurate. At the same time, the logistics information will be timely informed to the customer, including the name of the logistics company, waybill number, etc., to facilitate the customer to track the transportation status of the goods.

For orders with large quantities, the manufacturer may arrange special vehicle transportation to improve transportation efficiency and safety; for small batch orders, they will be shipped through third-party logistics companies. After the goods are shipped, the sales staff will regularly communicate with the customer and the logistics company to understand the transportation progress and arrival of the goods to ensure that the goods can be delivered on time.

If the customer finds problems such as damage or shortage of goods during the receipt process, they should contact the manufacturer in a timely manner. The manufacturer will handle it according to the actual situation, such as reissuing goods, replacing products or refunding, to protect the customer's rights and interests.

In order for customers to better understand the quality and performance of 4c copper-aluminum power cables, manufacturers usually provide sample services for customers to test and evaluate before bulk purchasing.

Customers can apply for samples from the manufacturer by phone, email, online platform, etc. When applying, detailed customer information and requirements need to be provided, such as company name, contact person, contact number, model, specification, quantity of the required samples, etc. After receiving the application, the manufacturer will review it within 1-3 working days, and arrange the preparation of samples after approval.

The production process of samples is the same as that of mass-produced products, strictly in accordance with production processes and quality standards to ensure that the quality and performance of samples are consistent with mass-produced products. The length of the sample is usually 1-5 meters, and the specific length can be adjusted according to customer needs.

The packaging of samples is similar to that of mass-produced products but more compact and exquisite. They are usually packaged in cartons or wooden boxes, with foam or soft materials filled inside to prevent damage during transportation. The model, specification, manufacturer and other information of the sample will be marked on the packaging.

Samples are usually transported by express. The manufacturer will choose a reputable express company to ensure that the samples can be delivered to customers quickly and safely. For domestic customers, samples are usually delivered within 3-5 working days; for international customers, the time varies according to the transportation distance and customs clearance, generally within 7-15 working days.

After receiving the samples, customers can conduct various performance tests, such as conductor resistance test, insulation resistance test, voltage resistance test, flame retardant performance test, mechanical performance test, etc. If customers have any questions or suggestions about the quality and performance of the samples, the manufacturer will arrange professional technical personnel to answer and communicate, and make adjustments and improvements according to customer feedback.

The after-sales service system of 4c copper-aluminum power cables is perfect, aiming to provide customers with comprehensive support and protection and solve problems encountered by customers in the process of use.

The warranty period of the product is 18 months from the date of leaving the factory. During the warranty period, if the product has quality problems caused by non-human factors, such as insulation layer aging, conductor breakage, sheath cracking, etc., the manufacturer will provide customers with free repair or replacement services. Customers need to provide purchase vouchers and detailed descriptions and pictures of product problems. The manufacturer will respond within 24 hours after receiving the information and arrange technical personnel to evaluate and handle it.

The manufacturer has a professional technical team to provide customers with technical support services. Customers can consult the manufacturer at any time when encountering any technical problems in the process of cable selection, laying, installation and use. Technical personnel will provide solutions through phone, email, video conference, etc., and can also arrange on-site guidance if necessary.

In addition, the manufacturer regularly visits customers to understand the use of products and collect customer opinions and suggestions. Based on customer feedback, the manufacturer continuously improves product quality and service levels to better meet customer needs.

If customers need to replace or repair products beyond the warranty period, the manufacturer will also provide paid services, and the fees will be reasonably charged according to the actual situation. At the same time, the manufacturer provides long-term supply of spare parts to ensure that customers can obtain necessary accessories in a timely manner during product use.

The after-sales service hotline is available 24 hours a day, and customers can call at any time to consult and report problems. The manufacturer's after-sales service personnel will respond quickly and handle customer problems efficiently to ensure customer satisfaction.

In summary, 4c 4mm²-185mm² copper-aluminum power cables, with their diverse specifications, excellent performance, reasonable prices and perfect after-sales service, play an important role in power transmission and distribution. Whether in household electricity, industrial production, urban construction or energy development, they can provide reliable power support, and are an important part of the modern power system.