The low-voltage YJV/YJV22 STA XLPE insulated armoured cable (600/1000V) is a 4-core power Transmission Cable specifically engineered for low-voltage power distribution systems. Its voltage rating is clearly specified as 600/1000V, which falls within the low-voltage range as defined by international standards such as IEC and domestic standards like GB/T 12706. This voltage rating ensures compatibility with alternating current (AC) power networks operating at 50Hz or 60Hz, making it suitable for integration into a wide range of low-voltage power distribution infrastructures.

In terms of conductor specifications, the cable utilizes high-purity electrolytic copper (CU) as the Conductor Material. The copper content is no less than 99.95%, with strict control over the content of impurities such as iron, phosphorus, and sulfur. The conductor adopts a stranded structure composed of multiple Copper Wires rather than a single solid Copper Conductor. The stranding process is designed to optimize Flexibility and electrical performance. The DC resistance of the conductor complies with the requirements of GB/T 3956; for instance, at 20°C, the DC resistance of a Single Core with a cross-sectional area of 10mm² in a 4-Core Cable does not exceed 1.83Ω/km. The resistivity of the copper conductor is extremely low, measuring no more than 0.017241Ω·mm²/m at 20°C, which is significantly lower than that of Aluminum Conductors, contributing to efficient current transmission with minimal power loss.

The insulation layer of the cable is made of high-density cross-linked polyethylene (XLPE). The XLPE material is processed through either peroxide cross-linking or silane cross-linking technology. The long-term allowable operating temperature of the XLPE insulation is 90°C, and in the event of a short-circuit fault (with a short-circuit duration not exceeding 5 seconds), it can withstand an instantaneous high temperature of up to 250°C without melting or breakdown. The volume resistivity of XLPE is no less than 1×10¹⁴Ω·cm at 20°C, and its dielectric loss tangent (tanδ) is no more than 0.003 at 50Hz, ensuring excellent electrical insulation performance. The insulation resistance of the cable at the rated voltage of 1000V is no less than 100MΩ at 20°C, and the insulation performance exhibits slow attenuation over long-term operation, reducing the risk of insulation failure due to aging. Additionally, the XLPE insulation layer has a tensile strength of no less than 12MPa and an elongation at break of no less than 200%, providing good mechanical durability. Its water absorption rate is no more than 0.01%, enabling it to maintain stable insulation performance in humid environments.

For the shielding layer, the cable is equipped with a copper tape screen. The copper tape used has a purity of no less than 99.9% and a thickness ranging from 0.1mm to 0.2mm. The copper tape is applied using a lapping process, ensuring a shielding coverage rate of no less than 90%. This shielding layer effectively suppresses electromagnetic interference (EMI) generated during cable operation. At the operating voltage of 1000V, the electromagnetic radiation intensity of the cable at a distance of 1m is no more than 50dBμV/m, meeting the requirements of GB/T 14436 for electromagnetic compatibility (EMC). The copper tape screen also serves as a path for fault current; in the event of insulation breakdown, fault current can be quickly conducted to the grounding system through the copper tape, triggering the operation of protective devices such as circuit breakers and fuses to isolate the faulty circuit. The cross-sectional area of the copper tape screen is matched to that of the conductor, typically ranging from 1/10 to 1/5 of the conductor's cross-sectional area, ensuring the smooth passage of fault current without breakage of the shielding layer. A semi-conductive water-blocking tape is applied between the copper tape screen and the insulation layer to prevent moisture infiltration, and the surface of the copper tape undergoes passivation treatment to reduce oxidation and maintain stable shielding performance over the long term.

The YJV22 model of the cable features a Steel Tape armoring layer on the outer side of the shielding layer, while the YJV model does not include this armoring. The steel tape used for armoring has a thickness of 0.8mm to 1.2mm and is hot-dip galvanized, with a zinc coating thickness of no less than 80g/m². The steel tape is applied using a double-layer lapping process, with a lapping gap not exceeding 50% of the steel tape width to ensure the continuity and integrity of the armoring layer. The steel tape armoring significantly enhances the cable's resistance to mechanical forces such as impact, tension, and extrusion. It can withstand soil pressure when directly buried and resist damage from minor mechanical rolling or friction in cable tray installations. The hot-dip galvanized coating provides sacrificial anode protection, and an asphalt anti-corrosion layer is added between the armoring layer and the sheath to further improve corrosion resistance, making the YJV22 model suitable for use in corrosive environments such as humid soil and chemical plants.

The sheath layer, which forms the outermost protective barrier of the cable, is made of weather-resistant polyvinyl chloride (PVC). The PVC Sheath is manufactured using an extrusion process, and its thickness varies depending on the cable's cross-sectional area; for example, the sheath thickness of a 4-core 10mm² cable is no less than 1.8mm. The Shore A hardness of the PVC sheath is no less than 85, providing good wear and impact resistance. It has a friction coefficient of no more than 0.3 when dragged in cable trays, minimizing damage during installation. The weather-resistant PVC sheath contains additives such as antioxidants and UV absorbers, allowing it to operate within a temperature range of -20°C to 60°C for long periods. At -20°C, it does not crack when bent, and at 60°C, its thermal shrinkage rate is no more than 5%. The water absorption rate of the PVC sheath is no more than 0.5%, and it can resist corrosion from common acids, alkalis, and salt sprays; for example, when immersed in a 5% sodium chloride salt spray for 1000 hours, no significant corrosion is observed on the sheath. The sheath material complies with the RoHS standard, free from harmful heavy metals such as lead, cadmium, and mercury, and has a certain flame-retardant performance with an oxygen index of no less than 28%, meeting the requirements of GB/T 18380 for flame-retardant cables.

The cable adopts a 4-core design, typically configured as Three Phase Conductors (L1, L2, L3) and one neutral conductor (N), which is compatible with three-phase four-wire low-voltage power distribution systems. The cross-sectional areas of the phase conductors and the neutral conductor are usually the same to ensure the neutral conductor can withstand unbalanced three-phase currents. In some specific specifications, a "three large and one small" cross-sectional configuration may be adopted to balance current-carrying requirements and cost efficiency. The insulation layers of the core conductors are color-coded in accordance with domestic standards for easy identification during installation, and the cores are stranded in either a fan-shaped or circular arrangement with a lay length ranging from 12 to 20 times the cable's outer diameter to ensure structural stability.

One of the key special features of this cable is the performance associated with the "STA" marking. The "STA" marking indicates that the cable meets specific additional performance standards, which typically include flame-retardant and low-smoke halogen-free properties (the exact performance should be confirmed with the detailed product specification sheet provided with each batch).

In terms of flame-retardant performance, if the STA marking denotes flame-retardant characteristics, the cable complies with the Class A, B, or C flame-retardant requirements specified in GB/T 18380.3-2008 "Tests on Electric and Optical Cables Under Fire Conditions - Part 3: Test for Vertical Flame Propagation for Bunched Wires and Cables". This flame-retardant capability allows the cable to resist the spread of flames in the event of a fire, helping to contain the fire within a limited area and reduce the risk of fire escalation.

For low-smoke halogen-free performance, when the STA marking represents low-smoke halogen-free properties, the insulation and sheath layers of the cable are made of low-smoke halogen-free materials instead of conventional XLPE and PVC. These low-smoke halogen-free materials produce minimal smoke and no halogen-containing toxic gases when burned. The light transmittance of the smoke generated during combustion is no less than 70% in accordance with GB/T 17651, and the concentration of hydrogen halide gases (such as HCl) released is no more than 5mg/g as per GB/T 17650. This feature is crucial in enclosed or environmentally sensitive areas where smoke and toxic gas accumulation can pose significant risks to human life and equipment.

The cable's applications are diverse, covering both general and special scenarios. In general scenarios, it is widely used in industrial plants for power supply to industrial equipment, in civil buildings for power distribution in residential communities and office buildings, and in municipal engineering for powering municipal facilities such as road lighting and water treatment plants. The YJV22 model, with its armoring layer, is suitable for direct burial and outdoor overhead installations, while the YJV model is more appropriate for indoor cable tray and pipeline installations. In special scenarios, the flame-retardant variant (associated with the STA marking) is used in densely populated areas such as hospitals, schools, and shopping malls to enhance fire safety. The low-smoke halogen-free variant is applied in enclosed spaces like subway tunnels and underground utility corridors to ensure safe evacuation and minimize equipment damage in case of fire. Additionally, the cable's corrosion-resistant properties make it suitable for use in chemical plants and other corrosive environments.

The materials used in the cable are carefully selected to ensure optimal performance and durability. The high-purity electrolytic copper conductor offers excellent electrical conductivity and corrosion resistance. Its low resistivity minimizes power loss during current transmission, and its resistance to oxidation ensures a long service life even in varying environmental conditions. The copper's mechanical strength also contributes to the overall robustness of the conductor, allowing it to withstand the stresses of installation and operation.

The XLPE Insulation Material provides superior electrical insulation and thermal stability compared to traditional PVC Insulation. Its high volume resistivity and low dielectric loss ensure efficient insulation, preventing electrical leakage and reducing energy loss. The cross-linking process enhances the material's thermal resistance, enabling it to operate at higher temperatures without degradation. Additionally, XLPE has good mechanical properties, including high tensile strength and elongation at break, which allow it to withstand mechanical stresses during handling and installation. Its resistance to chemicals and low water absorption further extend its applicability to a wide range of environments.

The copper tape used for shielding is of high purity, ensuring effective electromagnetic interference suppression. The lapping process ensures uniform coverage, and the addition of the semi-conductive water-blocking tape and passivation treatment enhances the shielding layer's stability and durability. The copper tape's ability to conduct fault current adds an important safety feature to the cable, facilitating the rapid isolation of faulty circuits.

The hot-dip galvanized steel tape for armoring (in YJV22 model) provides strong mechanical protection. The zinc coating offers corrosion resistance through sacrificial anode protection, and the asphalt anti-corrosion layer adds an extra barrier against moisture and corrosive substances. The double-layer lapping process ensures that the armoring layer is continuous and robust, capable of withstanding external mechanical impacts and pressures.

The weather-resistant PVC sheath combines mechanical protection with environmental adaptability. The additives in the PVC formulation enhance its resistance to UV radiation, temperature extremes, and chemical corrosion. Its flame-retardant properties contribute to the overall safety of the cable, while its compliance with RoHS standards ensures environmental friendliness.

The production of the low-voltage YJV/YJV22 STA XLPE insulated armoured cable involves a series of precise and controlled processes to ensure product quality and performance.

The first step is conductor manufacturing. High-purity electrolytic copper rods are drawn into copper wires of the required diameter using wire-drawing machines. The drawn copper wires are then stranded together using a stranding machine to form the conductor. The stranding process is carefully controlled to ensure the correct lay length and uniformity, which are critical for the conductor's electrical and mechanical properties. During stranding, tension is applied to the copper wires to ensure tight and consistent stranding, reducing the risk of loose wires that could affect performance.

Next is the insulation extrusion process. The Stranded Conductors are fed into an extruder, where XLPE material is extruded around the conductor to form the insulation layer. The extrusion process is monitored to control the thickness and uniformity of the insulation layer, ensuring it meets the specified requirements. The extruded insulation is then cross-linked using either peroxide cross-linking or silane cross-linking. In peroxide cross-linking, the insulation is heated to a specific temperature to activate the peroxide, which causes the XLPE molecules to cross-link, forming a three-dimensional network structure that enhances the material's thermal and mechanical properties. In silane cross-linking, the XLPE material is mixed with a silane coupling agent, and after extrusion, the insulation is exposed to moisture to initiate the cross-linking reaction.

After insulation, the shielding layer is applied. Copper tape is wrapped around the Insulated Conductor using a lapping machine. The lapping tension and speed are controlled to ensure the copper tape is tightly wrapped with the required coverage rate. A semi-conductive water-blocking tape may also be applied between the insulation and the copper tape to prevent moisture ingress. The copper tape edges are overlapped to ensure continuous shielding, and the surface of the copper tape may undergo passivation treatment to improve corrosion resistance.

For the YJV22 model, the armoring layer is added after shielding. Hot-dip galvanized steel tape is wrapped around the Shielded Cable using a double-layer lapping process. The lapping machine ensures that the steel tape is applied with the correct tension and overlap, creating a continuous and robust armoring layer. An asphalt anti-corrosion layer may be applied between the shielding layer and the steel tape to further enhance corrosion resistance.

The final step is sheath extrusion. The cable (with insulation, shielding, and armoring if applicable) is fed into a sheath extruder, where weather-resistant PVC material is extruded around the cable to form the outer sheath. The extrusion process is controlled to ensure the sheath thickness is uniform and meets the specified requirements. After extrusion, the cable is cooled using a water cooling system to solidify the sheath material. The cooled cable is then taken up onto reels for storage and transportation.

Throughout the production process, various quality control measures are implemented. Samples are taken at different stages of production to test parameters such as conductor resistance, insulation thickness and resistance, shielding coverage, and sheath thickness and mechanical properties. These tests ensure that each cable meets the relevant standards and specifications, guaranteeing consistent quality and performance.

The low-voltage YJV/YJV22 STA XLPE insulated armoured cable is packaged to ensure protection during storage, transportation, and handling. The primary packaging method involves winding the cable onto wooden or steel reels. The reels are designed to withstand the weight of the cable and the stresses of transportation. The size of the reels is determined based on the length and diameter of the cable; larger cables or longer lengths are typically wound onto larger reels to prevent excessive bending and damage to the cable.

The cable is tightly wound onto the reels to minimize movement during transportation. The outer layer of the cable on the reel is protected with a waterproof and dustproof covering, such as a polyethylene film or a heavy-duty paper wrap. This covering prevents moisture, dust, and other contaminants from reaching the cable surface, which could potentially damage the sheath or insulation. Additionally, the covering provides some protection against mechanical scratches and impacts during handling.

For smaller cable lengths or specific customer requirements, the cable may also be packaged in coils. The coils are wrapped with a similar waterproof and dustproof material and secured with straps to maintain their shape. Labels are attached to each reel or coil, providing essential information such as the cable model, specification (conductor cross-sectional area, number of cores, voltage rating), length, production date, batch number, and manufacturer's information. This labeling ensures easy identification and traceability of the product.

The reels or coils are further secured on pallets for transportation. The pallets are made of sturdy materials such as wood or plastic, capable of supporting the weight of the packaged cable. The packages are strapped to the pallets to prevent shifting during transit. For international shipments, the packaging may also comply with international standards for shipping, including requirements for wood packaging (such as ISPM 15 treatment to prevent the spread of pests).

The transportation of the low-voltage YJV/YJV22 STA XLPE insulated armoured cable requires careful planning and handling to ensure the product arrives at its destination in good condition. The cable can be transported by road, rail, sea, or air, depending on the destination, quantity, and urgency of the order.

During road transportation, the packaged cable reels or coils are loaded onto trucks using appropriate lifting equipment such as cranes or forklifts. The lifting equipment is operated by trained personnel to avoid dropping or damaging the packages. The packages are placed on the truck bed in a stable manner, with sufficient spacing between them to prevent collision during transit. The truck bed may be lined with non-slip materials to prevent the packages from sliding. For long-distance road transportation, the truck is equipped with shock-absorbing systems to minimize vibrations that could affect the cable.

Rail transportation is suitable for large quantities of cable. The packaged cable is loaded onto railcars, which are designed to carry heavy loads. The railcars are secured to prevent movement during the journey, and the packages are positioned to distribute the weight evenly. Rail transportation offers a more stable and less vibration-prone environment compared to road transportation, reducing the risk of damage to the cable.

Sea transportation is the primary choice for international shipments or large-volume orders that do not require urgent delivery. The packaged cable reels or coils are loaded into shipping containers, which are selected based on the size and quantity of the packages. Standard 20-foot or 40-foot containers are commonly used, and the packages are secured inside the containers using wooden braces, straps, or airbags to prevent movement during the voyage. The containers are inspected for water tightness and structural integrity before loading to ensure the cable is protected from seawater, humidity, and external impacts. Special attention is paid to the placement of the packages within the container to distribute weight evenly, avoiding excessive pressure on the bottom packages. During sea transit, the containers are exposed to varying temperatures, humidity levels, and vibrations; however, the robust packaging and container protection minimize the impact of these environmental factors on the cable.

Air transportation is reserved for urgent orders or small quantities of cable, such as replacement parts or sample deliveries. The packaged cable must comply with air freight regulations regarding weight, size, and hazardous materials. Since air transportation imposes stricter weight and size limits, the cable is often packaged in smaller coils or shorter reel lengths to fit within aircraft cargo hold constraints. The packages are wrapped in shock-absorbing materials such as foam or bubble wrap to withstand the vibrations and pressure changes during flight. Air freight carriers typically have specific handling procedures for Electrical Cables, and the packages are labeled with "Fragile" or "Handle with Care" stickers to ensure proper handling.

Regardless of the transportation mode, the cable packages are labeled with handling instructions, including the maximum stacking height, lifting points, and warnings against exposure to extreme temperatures or moisture. The transportation process is monitored using tracking systems, allowing both the manufacturer and the customer to track the location and status of the shipment in real time. Upon arrival at the destination, the customer is notified to arrange for unloading, and the manufacturer may provide guidance on proper unloading procedures to prevent damage to the cable.

The shipment process of the low-voltage YJV/YJV22 STA XLPE insulated armoured cable begins with order confirmation. Once the customer's order is confirmed, the manufacturer schedules production based on the order quantity, specifications, and delivery timeline. After production and quality inspection are completed, the cable is packaged as per the agreed packaging standards, and the shipment is prepared.

A detailed shipping document package is prepared for each shipment, including a commercial invoice, packing list, bill of lading (for sea freight), air waybill (for air freight), certificate of origin, and certificate of quality. The commercial invoice contains information such as the product name, model, quantity, unit price, total amount, payment terms, and shipping address. The packing list details the contents of each package, including the number of reels or coils, cable length, and gross/net weight. The bill of lading or air waybill serves as a contract of carriage between the manufacturer and the carrier, and it is required for customs clearance at the destination port/airport. The certificate of origin certifies the country where the cable was manufactured, which may be necessary to qualify for import duty exemptions or preferential tariffs. The certificate of quality provides evidence that the cable meets the specified standards and has passed all required quality tests.

For domestic shipments, the manufacturer coordinates with local logistics providers to arrange for pickup and delivery. The logistics provider is selected based on factors such as delivery speed, reliability, and cost-effectiveness. The shipment is usually delivered directly to the customer's designated address, and the customer is required to sign for receipt upon delivery. The manufacturer retains a copy of the delivery receipt for record-keeping purposes.

For international shipments, the manufacturer works with freight forwarders to handle the complex logistics process, including customs clearance, documentation, and transportation. The freight forwarder is responsible for preparing the necessary customs documents, ensuring compliance with the import regulations of the destination country, and arranging for the shipment to be transported from the manufacturer's facility to the destination port/airport. Once the shipment arrives at the destination port/airport, the freight forwarder coordinates with the local customs broker to clear the shipment through customs. The customer is then notified to arrange for pickup of the shipment or to have it delivered to their address.

The manufacturer provides the customer with a shipment tracking number once the shipment is dispatched. The customer can use this tracking number to monitor the progress of the shipment online through the carrier's or freight forwarder's website. In case of any delays or issues with the shipment, the manufacturer works closely with the carrier and the freight forwarder to resolve the problem promptly and keep the customer informed of the status.

The provision of samples is an important part of the sales process for the low-voltage YJV/YJV22 STA XLPE insulated armoured cable, as it allows customers to evaluate the product's quality, performance, and suitability for their specific applications before placing a large order.

The manufacturer offers sample cables upon request from customers. The sample size is typically a short length of cable, ranging from 1 meter to 5 meters, depending on the customer's requirements. The sample cable is manufactured using the same materials, production processes, and quality control standards as the full-scale production cables, ensuring that it accurately represents the characteristics and performance of the actual product.

To request a sample, the customer is required to provide details such as the cable model, specification (conductor cross-sectional area, number of cores, voltage rating), and the purpose of the sample (e.g., testing, demonstration). The manufacturer may charge a nominal fee for the sample, which is often refundable if the customer places a subsequent order for a certain quantity of cable. The sample fee covers the cost of materials, production, and shipping.

The sample cable is packaged in a small, protective package to ensure it arrives in good condition. The package is labeled with the customer's name, contact information, sample details, and the manufacturer's information. The sample is shipped using a reliable courier service, and the customer is provided with a tracking number to monitor the delivery status.

Upon receipt of the sample, the customer can conduct various tests and evaluations, such as visual inspection, dimensional measurement, electrical performance testing, and mechanical performance testing. The visual inspection involves checking the cable's appearance for any defects, such as cracks, scratches, or uneven insulation. Dimensional measurement includes measuring the conductor diameter, insulation thickness, sheath thickness, and overall cable diameter to ensure they meet the specified requirements. Electrical performance testing may include measuring the conductor resistance, insulation resistance, and dielectric strength. Mechanical performance testing may involve testing the cable's tensile strength, elongation at break, and impact resistance.

The manufacturer provides technical support to customers during the sample evaluation process. If the customer has any questions or needs assistance with testing the sample, they can contact the manufacturer's technical team, which is available to provide guidance and answer questions. The manufacturer also welcomes feedback from customers on the sample, as this helps to improve the product and better meet customer needs.

If the customer is satisfied with the sample, they can proceed to place a formal order. The manufacturer uses the sample specifications as the basis for producing the full order, ensuring consistency between the sample and the bulk product.

The manufacturer is committed to providing high-quality after-sales service to ensure customer satisfaction and to maintain long-term relationships with customers. The after-sales service covers a wide range of aspects, including technical support, warranty, repair, and replacement.

Technical support is available to customers both before and after the installation of the cable. Before installation, the manufacturer's technical team provides guidance on cable selection, installation methods, and safety precautions. They can answer questions related to the cable's performance, compatibility with other electrical equipment, and installation requirements. The technical team may also provide installation drawings, user manuals, and other technical documents to assist customers with the installation process.

After installation, the manufacturer continues to provide technical support to address any issues that may arise during the operation of the cable. Customers can contact the technical team via phone, email, or online chat for troubleshooting assistance. The technical team works with the customer to identify the cause of the problem and provides solutions to resolve it. In some cases, the technical team may send a field engineer to the customer's site to inspect the cable and provide on-site support.

The low-voltage YJV/YJV22 STA XLPE insulated armoured cable comes with a standard warranty period. The warranty period typically ranges from 1 year to 5 years, depending on the product model and the terms of the sales contract. During the warranty period, if the cable fails to perform as specified due to manufacturing defects or material quality issues, the manufacturer will provide repair or replacement services free of charge.

To make a warranty claim, the customer is required to provide proof of purchase, such as the invoice or delivery receipt, and a detailed description of the problem. The manufacturer may also request samples of the defective cable for inspection to determine the cause of the failure. If the failure is confirmed to be covered under the warranty, the manufacturer will arrange for the repair or replacement of the cable. The repair or replacement process is completed as quickly as possible to minimize the impact on the customer's operations.

In addition to the standard warranty, the manufacturer offers extended warranty options for customers who require additional protection. The extended warranty can be purchased at the time of placing the order or within a specified period after the initial purchase. The extended warranty provides coverage for a longer period and may include additional benefits, such as priority technical support and faster repair/replacement services.

If the cable is damaged due to improper installation, misuse, or external factors not covered under the warranty, the manufacturer may still provide repair services for a fee. The cost of the repair depends on the extent of the damage and the type of repair required. The manufacturer will provide the customer with a cost estimate before proceeding with the repair, and the customer can decide whether to proceed with the repair or to purchase a new cable.

The manufacturer also values customer feedback and uses it to improve the product and the after-sales service. After the completion of a project or the resolution of an after-sales issue, the manufacturer may conduct a customer satisfaction survey to gather feedback on the product's performance, the quality of the after-sales service, and areas for improvement. The feedback is reviewed by the relevant departments, and appropriate actions are taken to address any issues and enhance the overall customer experience.

Furthermore, the manufacturer provides training services to customers on the proper use, maintenance, and troubleshooting of the cable. The training can be conducted at the customer's site or at the manufacturer's training facility, depending on the customer's preferences. The training courses are designed to help customers understand the cable's features and performance, master the correct installation and maintenance methods，and effectively troubleshoot common problems. This helps to ensure the safe and reliable operation of the cable and extends its service life.

In summary, the manufacturer's comprehensive after-sales service system is designed to provide customers with the support they need throughout the entire lifecycle of the cable, from pre-installation to post-operation. By offering technical support, warranty, repair, replacement, and training services, the manufacturer aims to ensure customer satisfaction and build trust with customers.