I. Core Information about the Product Itself
(1) Specification Parameters
Conductor Parameters
The 21 core stranded
PVC Control Cable 300/500V
Copper Core features conductors made of high-purity electrolytic copper with a purity of ≥99.95%. This high purity is crucial for minimizing signal attenuation and ensuring efficient transmission of control signals. The common cross-sectional areas of each
Single Core are 0.5mm² and 0.75mm², with strict dimensional tolerances of ±0.02mm to guarantee consistent performance. For the 0.5mm² core, the diameter is approximately 0.8mm, while the 0.75mm² core has a diameter of about 1.0mm.
At a temperature of 20℃, the DC resistance of the 0.5mm² conductor is ≤36.0Ω/km, and for the 0.75mm² conductor, it is ≤24.5Ω/km. These low resistance values ensure that even weak control signals can be transmitted efficiently over distances up to 100 meters without significant loss. The conductors undergo an annealing process, which involves heating them to around 400-500℃ in a controlled atmosphere and then cooling them slowly. This treatment enhances their ductility, with a tensile strength of ≥200MPa and an elongation at break of ≥30%, making them resistant to breakage during installation and handling.
Insulation Parameters
Each individual conductor is independently coated with a
PVC Insulation layer. The thickness of this insulation layer is ≥0.2mm, with a tolerance of ±0.02mm, ensuring uniform coverage and reliable insulation between cores. The insulation resistance of each core is ≥100MΩ·km at 20℃, which is a key indicator of its ability to prevent signal crosstalk between cores. Additionally, the insulation can withstand an AC voltage of 500V for 1 minute without breakdown, further confirming its effectiveness in isolating signals.
The PVC
Insulation Material is specially formulated to have good electrical properties, with a dielectric constant of ≤3.5 and a dielectric loss tangent of ≤0.03 at 50Hz. These properties help to minimize signal distortion and ensure the integrity of the transmitted control signals. The insulation also exhibits excellent mechanical strength, with a tensile strength of ≥12MPa and an elongation at break of ≥150%, allowing it to withstand the mechanical stresses encountered during installation and operation.
Sheath Parameters
The overall sheath of the cable is made of flame-retardant PVC material, with a thickness of ≥0.8mm and a tolerance of ±0.05mm. This sheath provides comprehensive protection to the internal cores, safeguarding them against mechanical damage, moisture, and dust. The sheath has a wide temperature resistance range of -15℃ to 70℃, enabling the cable to function reliably in various environmental conditions, from cold industrial warehouses to warm mechanical rooms.
In terms of flame retardancy, the sheath material has an oxygen index of ≥30 and passes the vertical burning test, with a self-extinguishing time of ≤30 seconds. This ensures that in the event of a fire, the cable will not contribute significantly to the spread of flames, enhancing the safety of the systems it is used in. The sheath also has good resistance to oil and abrasion. When immersed in industrial oil for 24 hours, the insulation resistance retention rate is ≥80%, and after 10,000 cycles of abrasion testing, the sheath shows no signs of damage that would compromise the cable's performance.
Structural and Safety Parameters
The 21 cores are stranded together to form the cable core, with a carefully controlled stranding pitch of 15-20 times the diameter of a single core. This stranding design not only improves the
Flexibility of the cable but also reduces electromagnetic interference between cores, ensuring stable signal transmission. The overall outer diameter of the cable varies depending on the core size, ranging from approximately 8mm for the 0.5mm² cores to 12mm for the 0.75mm² cores.
The minimum bending radius of the cable is ≥6 times its outer diameter, allowing for easy installation in tight spaces, such as within machinery or inside wall cavities. The rated voltage of the cable is 300/500V, making it suitable for low-voltage control systems. It complies with the national standard GB/T 9330 for control cables and has obtained the CCC certification, ensuring that it meets strict safety and quality requirements.
The cable also demonstrates excellent resistance to mechanical vibration. After undergoing a vibration test with a frequency range of 10-500Hz and an acceleration of 10g, the conductor connections remain secure, and there is no significant degradation in signal transmission performance. This makes it highly suitable for use in vibration-prone environments such as machine tools and production lines.
(2) Characteristic Applications
Industrial Automation Control
In industrial automation settings, such as automobile manufacturing and food processing production lines, this 2
1 Core Cable plays a vital role as the connection between PLC (Programmable Logic Controller) systems and various sensors and actuators. The multiple cores allow for the simultaneous transmission of numerous control signals, including motor start-stop commands, valve opening and closing instructions, temperature and pressure monitoring data, and position feedback signals. This reduces the complexity of wiring, as a single cable can replace multiple individual wires, simplifying the installation process and reducing the risk of wiring errors.
For example, in an automated automobile assembly line, the cable connects the central PLC to robotic arms, conveyor belts, and quality inspection sensors. It transmits signals that control the precise movements of the robotic arms, adjust the speed of the conveyor belts, and send real-time data from the sensors regarding the position and quality of the workpieces. The response delay of the cable is ≤10ms, ensuring that the various components of the production line can operate in precise coordination, improving production efficiency and product quality.
Building Intelligent Systems
The 21 core stranded PVC control cable is widely used in building intelligent systems, including building automation systems, security systems, and energy management systems. In building automation, it connects the central control room to air conditioning units, lighting modules, ventilation systems, and elevators. Each core can be dedicated to a specific function, such as transmitting temperature adjustment signals to air conditioning units, sending lighting switch commands to lighting modules, or relaying status information from elevators.
In large shopping malls, for instance, the cable enables centralized control of multiple systems. It allows the central control room to independently adjust the temperature in different areas of the mall, activate emergency lighting in case of a power outage, and receive feedback from fire alarm sensors to trigger appropriate responses. This integrated control not only improves the comfort and safety of the building but also enhances energy efficiency by optimizing the operation of various systems.
Mechanical Equipment Linkage
This control cable is an essential component in the
Internal Wiring of various mechanical equipment, such as CNC machine tools, packaging machinery, and injection molding machines. It connects the operation panel to servo systems, encoders, and other critical components, enabling the transmission of control signals and feedback data.
In CNC machine tools, the cable integrates signals for spindle speed adjustment, tool feed rate control, and position feedback from encoders. The stranded design of the cable helps to reduce electromagnetic interference generated by the machine's operation, ensuring that the control signals remain stable and accurate, which is crucial for maintaining the precision of machining operations. In injection molding machines, it transmits signals related to barrel temperature control, mold clamping force adjustment, and injection speed, ensuring consistent product quality.
(3) Material Styles
Conductor Material
The conductors are made of high-purity electrolytic copper, which is obtained through a rigorous refining process that removes impurities such as iron, lead, and sulfur. This high-purity copper has excellent electrical conductivity, with a conductivity of ≥101% IACS (International Annealed Copper Standard), ensuring efficient signal transmission. The copper surface is bright and free from oxidation, which helps to maintain good electrical contact and prevent signal degradation over time.
The conductors are in the form of
Solid Wires, which provides a stable and consistent electrical path. The solid core design also makes termination easier, as it can be securely connected to terminals and connectors without the need for additional crimping tools.
Insulation Material
The insulation layer is composed of PVC, a thermoplastic polymer that offers excellent electrical insulation properties, mechanical strength, and
Chemical Resistance. The PVC used for insulation is a specially formulated grade that contains additives to enhance its flexibility, heat resistance, and flame retardancy. These additives include plasticizers to improve flexibility, stabilizers to prevent degradation at high temperatures, and flame retardants to meet the required fire safety standards.
The insulation layers of different cores are color-coded to facilitate easy identification and wiring. Common colors include black, white, red, blue, green, yellow, and various combinations of stripes. This color-coding helps electricians and technicians quickly distinguish between different cores, reducing the risk of wiring errors during installation and maintenance.
Sheath Material
The sheath is made of flame-retardant PVC, which is similar in composition to the insulation material but with additional additives to enhance its mechanical strength, weather resistance, and flame retardancy. The sheath material contains a higher proportion of flame retardants, such as aluminum hydroxide or magnesium hydroxide, which release water vapor when exposed to high temperatures, helping to suppress combustion. It also includes UV stabilizers to prevent degradation from exposure to sunlight, making the cable suitable for both indoor and some outdoor applications.
The sheath has a smooth, uniform surface, which allows for easy installation and reduces the risk of damage during pulling through conduits or cable trays. It is typically black in color, which not only provides a professional appearance but also helps to absorb heat, reducing the impact of temperature fluctuations on the cable's performance.
Overall Style
The overall structure of the 21 core stranded PVC control cable is compact and robust. The 21 individually
Insulated Cores are stranded together in a helical pattern, with a filler material (usually made of non-hygroscopic polyester) used to fill the gaps between the cores. This filler ensures that the cable has a round and stable cross-section, making it easier to handle and install. The
Stranded Cores are then covered by the outer
PVC Sheath, which binds them together and provides overall protection.
The cable is available in various lengths, with the most common being 100 meters per reel, although custom lengths can be provided upon request. The surface of the sheath is printed with clear and durable markings, including the cable type, number of cores, cross-sectional area, rated voltage, manufacturer's name, production date, batch number, and certification marks (such as CCC). These markings provide important information for identification, quality control, and compliance purposes.
(4) Production Process
Conductor Drawing and Annealing
The production process begins with high-quality copper rods, which are made from electrolytic copper. These copper rods are fed into a wire drawing machine, where they are pulled through a series of diamond dies with progressively smaller apertures. This process reduces the diameter of the copper rod to the required size for the 0.5mm² or 0.75mm² cores. During drawing, a lubricant (usually a mixture of oil and water) is applied to reduce friction and heat generation, ensuring a smooth surface finish and precise dimensional control.
After drawing, the
Copper Wires undergo an annealing process in a continuous annealing furnace. The wires are heated to a temperature of 400-500℃ in a protective atmosphere of nitrogen or hydrogen to prevent oxidation. The annealing process relieves the internal stresses generated during drawing, improves the ductility of the copper, and enhances its electrical conductivity. The annealed wires are then cooled to room temperature and spooled onto reels for further processing.
Insulation Extrusion
Each annealed copper wire is then fed into an insulation extrusion line. The
PVC Insulation Material, in the form of pellets, is fed into an extruder, where it is heated to a molten state (typically between 160-190℃). The molten PVC is then forced through a crosshead die that surrounds the copper wire, forming a continuous layer of insulation around it. The thickness of the insulation layer is precisely controlled by adjusting the extrusion speed, the pressure of the molten PVC, and the size of the die.
After extrusion, the
Insulated Wire passes through a water cooling bath to solidify the PVC insulation. The cooling process is carefully controlled to ensure that the insulation layer adheres firmly to the copper wire and has a smooth surface. The insulated wires are then spooled onto reels, and each reel is inspected for insulation thickness, surface quality, and electrical insulation properties.
Core Stranding
The next step is the stranding of the 21 insulated cores. The insulated wires, each on its own pay-off reel, are fed into a stranding machine. The machine rotates the cores around a central axis, twisting them together in a helical pattern with a controlled stranding pitch of 15-20 times the diameter of a single core. This stranding process is performed in multiple passes to ensure uniform tension and lay length across all cores.
During stranding, a filler material is added to fill the gaps between the cores, ensuring that the stranded core has a round and stable shape. The filler is typically a non-woven polyester material that is resistant to moisture and rot. After stranding, the cable core is wrapped with a binder tape (usually made of polyester) to hold the cores together and prevent them from unraveling during subsequent processing.
Sheath Extrusion
The
Stranded Cable core is then fed into a sheath extrusion line. Similar to the insulation extrusion process, the flame-retardant PVC sheath material is melted in an extruder and forced through a die that surrounds the cable core, forming a continuous outer sheath. The thickness of the sheath is controlled to be ≥0.8mm, with precise adjustments made to the extrusion parameters to ensure uniform coverage.
After extrusion, the
Sheathed Cable is cooled in a water bath to solidify the PVC sheath. The cooling process is designed to prevent the sheath from shrinking or warping, ensuring that it maintains its dimensions and adheres properly to the underlying cable core. The finished cable is then spooled onto large reels, with the length of each reel typically being 100 meters.
Printing and Quality Inspection
Once the cable is spooled, it undergoes a printing process. A specialized inkjet printer applies the required markings onto the surface of the sheath, including the cable specifications, rated voltage, manufacturer information, and certification marks. The ink used is resistant to abrasion and fading, ensuring that the markings remain legible throughout the cable's service life.
The final step is a comprehensive quality inspection. Samples from each production batch are tested for various properties, including conductor resistance, insulation resistance, withstand voltage, flame retardancy, and mechanical strength. The cable's dimensions, such as the core diameter, insulation thickness, sheath thickness, and overall outer diameter, are also measured to ensure they meet the specified requirements. Only cables that pass all these tests are approved for release.
II. General Product Information
(1) Packaging
The 21 core stranded PVC control cable 300/500V copper core is typically packaged on sturdy wooden or plastic reels. The reels have a flange diameter that varies depending on the cable's outer diameter and length, with common sizes ranging from 300mm to 600mm. The cable is neatly wound onto the reels, with a layer of plastic film wrapped around the outside to protect it from dust, moisture, and mechanical damage during storage and transportation.
Each reel is labeled with a detailed tag that includes the product name, type (21 core stranded PVC control cable), number of cores, cross-sectional area of each core, rated voltage (300/500V), length of the cable on the reel (usually 100 meters), production date, batch number, manufacturer's name and contact information, and certification marks (such as CCC). The tag is made of durable, weather-resistant material to ensure that the information remains readable even in harsh storage conditions.
For bulk shipments, multiple reels may be packed into wooden crates. The crates are constructed from strong plywood to provide additional protection during transportation, especially for long-distance or international shipments. The crates are also labeled with the same product information as the reels, along with handling instructions and weight details to facilitate proper loading and unloading.
(2) Transportation
The transportation of the 21 core stranded PVC control cable requires careful handling to ensure that the product arrives in good condition. During transportation, the reels or crates should be stored in a dry, well-ventilated area, protected from direct sunlight, rain, snow, and extreme temperatures. Exposure to moisture can damage the cable's insulation and sheath, while extreme heat can cause the PVC materials to soften and deform, and extreme cold can make them brittle.
When loading and unloading, mechanical equipment such as forklifts or cranes should be used, with proper lifting attachments to avoid damaging the reels or the cable. The reels should be lifted from the center hub, and care should be taken to prevent them from tipping over or colliding with other objects. For smaller reels, manual handling is possible, but workers should be trained to lift them correctly to avoid injury.
The cable can be transported by various means, including road, rail, sea, or air, depending on the destination and urgency. For domestic shipments within a country, road transport is commonly used, with trucks equipped with covered trailers to protect the cargo from the elements. For longer distances, rail transport is a cost-effective option, while sea transport is preferred for international shipments. Air transport is used for urgent orders, although it is more expensive.
During transit, the cargo should be secured properly to prevent movement and shifting. For road transport, the reels can be strapped to the trailer bed using heavy-duty straps, and wooden blocks can be placed between them to prevent rolling. For sea transport, the reels or crates are loaded into shipping containers, which are then secured to the ship's deck or in the hold.
(3) Delivery
The delivery process for the 21 core stranded PVC control cable typically begins with the customer placing an order. The manufacturer or supplier will confirm the order details, including the quantity, specifications, delivery address, and desired delivery date. If the cable is in stock, it will be prepared for shipment immediately. For custom orders or large quantities that require production, the manufacturer will provide an estimated production timeline and keep the customer informed of progress.
Once the cable is ready for shipment, the supplier will arrange for transportation as per the customer’s request. A shipping document, including a packing list, invoice, and bill of lading (for international shipments), will be prepared and sent to the customer. The packing list details the quantity of reels, their lengths, and specifications, while the invoice includes pricing and payment terms. The bill of lading serves as a contract of carriage between the shipper and the carrier.
The customer will be notified of the shipment, including the carrier’s name, tracking number, and expected delivery date. This allows the customer to monitor the shipment’s progress and make arrangements for receipt. Upon delivery, the customer should inspect the packaging for any signs of damage. If the packaging is intact, the reels can be accepted and stored in a suitable location. Any damage should be documented and reported to the supplier and carrier immediately to initiate a claim if necessary.
(4) Samples
Manufacturers and suppliers of the 21 core stranded PVC control cable typically offer samples to customers for testing and evaluation. Samples are an essential part of the pre-purchase process, allowing customers to verify the cable’s quality, performance, and compatibility with their specific applications.
Customers can request samples through various channels, such as the supplier’s website, email, or phone. The standard sample length is usually 1-5 meters, which is sufficient for conducting basic tests, including visual inspection, measurement of dimensions, and checks for flexibility and insulation integrity. In most cases, the samples themselves are provided free of charge, but the customer is responsible for the shipping costs.
The samples are packaged in protective materials, such as plastic bags or small cardboard boxes, to prevent damage during transit. They may also include a product data sheet that provides detailed specifications, performance parameters, and certification information. This helps the customer compare the sample with their requirements and make an informed purchasing decision.
Once the customer receives the sample, they can conduct tests such as measuring the conductor diameter, insulation thickness, and overall outer diameter to ensure they meet the specified requirements. They may also perform electrical tests, such as checking insulation resistance and withstand voltage, to verify the cable’s electrical performance. Feedback from the customer regarding the sample is valuable for the supplier, as it helps improve the product and address any concerns.
(5) After-Sales Service
The after-sales service for the 21 core stranded PVC control cable is designed to ensure customer satisfaction and address any issues that may arise after purchase. This includes support for installation, troubleshooting, and handling of defective products.
Installation Support: Suppliers often provide technical documentation, such as installation guides and wiring diagrams, to assist customers in correctly installing the cable. These guides include information on proper handling, bending radius, termination methods, and compatibility with connectors and terminals. Technical support teams are also available to answer questions and provide advice via phone, email, or video calls.
Troubleshooting: If customers encounter problems with the cable during installation or operation, the after-sales team can help diagnose the issue. Common issues may include signal interference, insulation damage, or poor conductivity. The team may request information such as the installation environment, test results, and photos of the problem to provide accurate solutions. In some cases, a technical representative may visit the customer’s site to inspect the installation and resolve the issue.
Warranty and Replacement: The cable typically comes with a warranty period, which is usually 1-5 years from the date of purchase, depending on the manufacturer. The warranty covers defects in materials and workmanship, such as faulty insulation, conductor breaks, or inadequate stranding. If a defect is found within the warranty period, the supplier will replace the defective cable free of charge or provide a refund, depending on the customer’s preference.
To claim the warranty, the customer must provide proof of purchase, such as an invoice or order number, and details of the defect. The supplier may request the defective cable to be returned for inspection to determine the cause of the issue. If the defect is due to improper installation, misuse, or damage caused by external factors (such as mechanical impact or exposure to chemicals), the warranty may not apply.
Feedback and Continuous Improvement: Suppliers value customer feedback on the product and service. They may conduct follow-up surveys to gather opinions on the cable’s performance, ease of installation, and overall satisfaction. This feedback is used to identify areas for improvement in the product design, production process, or service offerings, ensuring that the cable continues to meet the evolving needs of customers.
In summary, the 21 core stranded PVC control cable 300/500V copper core is a high-performance product designed for reliable signal transmission in industrial automation, building intelligent systems, and mechanical equipment linkage. Its detailed specification parameters, versatile applications, high-quality materials, and rigorous production process ensure its suitability for a wide range of low-voltage control systems. The comprehensive packaging, transportation, delivery, sample, and after-sales services further enhance its value, providing customers with a seamless experience from purchase to installation and beyond.
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