Rigid Shielded Cable U-1000 Rvfv & Vvfv / Rvfv-K & Vvfv-K 3X95+70 mm2

The Rigid Shielded Cable U-1000 series, encompassing Rvfv, Vvfv, Rvfv-K, and Vvfv-K with the 3X95+70 mm² configuration, boasts a comprehensive set of specification parameters that underscore its suitability for high-demand environments requiring both robust power transmission and exceptional anti-interference capabilities.

At the core of its electrical performance is the rated voltage of U-1000V, which positions the cable to handle medium to high-voltage applications. This voltage rating ensures compatibility with a wide range of systems, from industrial control circuits operating at lower voltages to medium-voltage power distribution networks, making it a versatile choice for diverse engineering projects.

The 3X95+70 mm² conductor configuration is meticulously engineered to balance power delivery and system stability. The three 95mm² conductors function as phase lines (L1, L2, L3) in three-phase systems, while the 70mm² conductor serves as either a neutral line (N) or a grounding line (PE), depending on the application. This design is particularly effective in addressing three-phase unbalanced loads, as the neutral line can carry the resultant current, preventing voltage fluctuations that could damage sensitive equipment.

Current-carrying capacity is a critical parameter, and this cable excels in this regard. At an ambient temperature of 25℃, each 95mm² phase conductor can sustain a long-term current of approximately 230A, while the 70mm² conductor handles around 180A. Translating these figures to power output in a three-phase 380V system, the cable can deliver up to approximately 150kW (calculated using the formula P = √3 × U × I × cosφ, where U = 380V, I = 230A, and cosφ = 0.85). This power capacity is more than sufficient to support high-power equipment such as large industrial motors, high-frequency inverters, and heavy machinery, ensuring continuous and stable operation even under peak loads.

Physical dimensions are carefully calibrated to balance functionality and durability. The overall outer diameter of the cable is approximately 65mm, a measurement that accounts for the combined thickness of all layers. The insulation layer, which varies by model (PVC for Rvfv/Rvfv-K and XLPE for Vvfv/Vvfv-K), has a uniform thickness of about 2.5mm, providing robust electrical isolation between conductors to prevent short circuits and leakage currents. The shielding layer, a defining feature of this cable, measures approximately 0.3mm in thickness, with variations in structure between models (copper tape for standard versions and copper braid + aluminum foil for K-models). The outer sheath, crafted from rigid PVC or low-smoke zero-halogen (LSZH) material, adds 3.0mm to the overall diameter, offering mechanical protection and environmental resistance.

The rigid structural design imposes a minimum bending radius of 15 times the outer diameter, equating to approximately 975mm. This characteristic, while limiting Flexibility, ensures that the cable maintains its integrity during installation and operation, making it ideal for fixed 敷设 scenarios such as cable trays, conduits, or direct burial where movement is minimal.

Thermal performance is another standout feature. The cable can withstand short-term temperatures up to 105℃, a critical attribute for handling transient overloads or high-temperature environments. For continuous operation, the maximum temperature ratings differ by insulation type: PVC-insulated models (Rvfv, Rvfv-K) are rated for 70℃, while XLPE-insulated models (Vvfv, Vvfv-K) can operate at 90℃, making the latter more suitable for high-temperature industrial settings.

Shielding effectiveness, a key parameter for anti-interference performance, is ≥85dB across the series. This high level of shielding ensures that the cable can block external electromagnetic interference (EMI) and radio frequency interference (RFI) from sources such as motors, transformers, and radio transmitters, while also preventing internal signals or power fluctuations from interfering with nearby equipment. The K-models, with their composite shielding, achieve even higher shielding effectiveness in certain frequency ranges, making them ideal for applications involving high-frequency signals.

Conductor resistance is minimized to reduce power loss. At 20℃, the maximum DC resistance is ≤0.193Ω/km for the 95mm² conductors and ≤0.268Ω/km for the 70mm² conductor. These low resistance values ensure efficient power transmission, even over long distances, which is particularly important in large industrial facilities or energy transmission projects where energy efficiency is a priority.

Other notable parameters include the cable’s weight (approximately 8.5kg per meter), which influences handling and installation requirements, and its flame retardancy. Depending on the sheath material, the cable may meet flame retardancy standards such as IEC 60332-1-2, ensuring it resists ignition and slows the spread of fire in case of a fault.

The Rigid Shielded Cable U-1000 series with 3X95+70 mm² specification is engineered to excel in environments where both reliable power transmission and strong anti-interference capabilities are essential. Its unique combination of high current capacity, rigid structure, and advanced shielding makes it indispensable across a range of critical applications.

In industrial automation, the cable is a cornerstone of precision manufacturing processes. CNC machine tools, which require precise control signals to maintain accuracy in machining operations, rely on this cable to transmit both power and control signals. The shielding layer effectively blocks EMI generated by high-speed motor drives and variable frequency drives, preventing signal distortion that could lead to dimensional errors in machined parts. Similarly, in robot workstations, where multiple robots operate in close proximity, the cable’s anti-interference properties prevent cross-talk between robot control systems, ensuring coordinated and safe operation. The rigid structure of the cable is particularly beneficial in these settings, as it maintains stable routing in crowded machinery spaces, reducing the risk of accidental damage or disconnection.

The energy industry leverages the cable’s robustness and environmental resistance. In wind farms, it connects combiner boxes to inverters, transmitting power generated by wind turbines while withstanding the harsh conditions of high altitudes—including extreme temperature variations (-40℃ to 80℃), strong winds, and UV radiation. The XLPE-insulated Vvfv and Vvfv-K models are preferred here for their superior heat resistance, ensuring reliable performance even during prolonged exposure to sunlight. In photovoltaic (PV) Power Stations, the cable serves a similar role, linking PV modules to inverters and withstanding the thermal cycling caused by day-night temperature differences. The shielding layer protects against EMI from inverters, ensuring stable power output to the grid.

Large-scale smart buildings depend on the cable to integrate power distribution with complex control systems. In skyscrapers, shopping malls, and data centers, the cable acts as a backbone for transmitting both electrical power and signals for security systems (CCTV, access control), fire alarm systems, and building management systems (BMS). The shielding layer prevents interference between these systems—for example, ensuring that power fluctuations in HVAC systems do not disrupt fire alarm signals. The rigid structure simplifies installation in building risers and cable trays, providing a neat and durable routing solution that minimizes maintenance needs.

Rail transit systems benefit from the cable’s ability to withstand vibration and electromagnetic noise. In subway and light rail networks, it is used in traction auxiliary systems to power lighting, ventilation, and communication equipment in passenger cars and stations. The rigid sheath and conductor stranding absorb the continuous vibration from moving trains, preventing fatigue damage over time. The high shielding effectiveness is critical here, as transit systems are filled with EMI sources such as traction motors and Overhead Lines; the cable ensures that control signals for train operations remain unaffected, enhancing safety and reliability.

In medical facilities, the cable’s low electromagnetic emissions make it suitable for powering and connecting sensitive equipment. MRI machines, which generate strong magnetic fields, require cables that do not emit interfering signals that could distort imaging results. The shielding layer of the Rvfv-K and Vvfv-K models contains these emissions, while also protecting the equipment from external EMI. Similarly, in CT scan rooms and operating theaters, the cable ensures stable power delivery to life-support systems and monitoring equipment, where even minor interruptions could have severe consequences.

Marine and offshore applications also utilize the cable, particularly in shipboard power distribution and offshore oil rigs. The rigid PVC Sheath resists saltwater corrosion and mechanical damage from wave action, while the shielding protects against EMI from radar systems and navigation equipment. The 3X95+70 mm² configuration provides sufficient power to run pumps, cranes, and communication systems, ensuring the smooth operation of offshore facilities.

In summary, the Rigid Shielded Cable U-1000 series 3X95+70 mm² is a versatile solution that meets the demanding requirements of industrial automation, energy transmission, smart buildings, rail transit, medical facilities, and marine applications, providing reliable performance where power and signal integrity are critical.

The Rigid Shielded Cable U-1000 series 3X95+70 mm² incorporates a carefully selected combination of materials and a distinctive structural design, ensuring optimal performance in terms of conductivity, insulation, shielding, and mechanical durability.

Conductors: The conductors are crafted from high-purity electrolytic copper with a purity of ≥99.95%. This high purity is essential for minimizing electrical resistance, ensuring efficient power transmission with minimal loss. The copper is processed using a compact stranding technique, where multiple thin Copper Wires are twisted together under high pressure to form a dense, circular conductor. This process enhances several key properties: it increases the conductor’s surface area, improving heat dissipation; it enhances flexibility compared to solid conductors, despite the cable’s overall rigidity; and it reduces the risk of conductor breakage under mechanical stress, such as vibration or bending during installation. The 95mm² and 70mm² conductors are each composed of dozens of individual strands, precisely calibrated to achieve the required cross-sectional area and current-carrying capacity.

Insulation: The insulation layer varies by model to cater to different application needs. Rvfv and Rvfv-K cables use flexible polyvinyl chloride (PVC), a cost-effective material with good electrical insulation properties and moderate temperature resistance (up to 70℃ continuous operation). PVC is chosen for its ease of processing and flexibility, which, while balanced against the cable’s overall rigidity, allows for some degree of maneuverability during installation. In contrast, Vvfv and Vvfv-K cables utilize cross-linked polyethylene (XLPE), a material that undergoes a chemical or radiation-induced cross-linking process to form a three-dimensional molecular structure. This structure significantly enhances XLPE’s thermal resistance (up to 90℃ continuous operation) and mechanical strength, making it suitable for high-temperature environments and applications requiring long-term durability. Both Insulation Materials are formulated to have high volume resistivity (≥10¹⁴Ω·cm), ensuring effective isolation between conductors to prevent short circuits.

Shielding: The shielding layer is a defining feature that sets this cable apart, with variations between standard and K-models. Rvfv and Vvfv cables employ a copper Tape Shielding design, where a thin (0.3mm) strip of high-conductivity copper is helically wrapped around the Insulated Conductors with a minimum overlap of 15-20%. This design provides a continuous barrier against EMI/RFI, with the overlap ensuring no gaps in coverage. The copper tape is tinned to prevent oxidation, maintaining its conductivity over time. Rvfv-K and Vvfv-K models feature a composite shielding system: a layer of tinned copper braid (with 85% coverage) combined with an aluminum foil laminate. The copper braid offers excellent flexibility and conductivity, making it effective at blocking high-frequency interference, while the aluminum foil provides a low-resistance barrier against low-frequency interference. This dual-layer approach achieves higher shielding effectiveness (≥90dB in some frequency ranges) compared to standard models, making K-models ideal for applications involving sensitive electronic equipment or high-frequency signals.

Outer Sheath: The outer sheath is responsible for protecting the internal components from mechanical damage, environmental factors, and chemical exposure, while also contributing to the cable’s rigid structure. It is available in two materials: rigid PVC and low-smoke zero-halogen (LSZH). Rigid PVC is the standard option, offering excellent resistance to abrasion, oil, grease, and UV radiation, as well as good flame retardancy. It is cost-effective and well-suited for general industrial and indoor applications. LSZH sheaths, on the other hand, are designed for environments where fire safety is critical, such as enclosed spaces in buildings, tunnels, and public transport. When burned, LSZH materials emit minimal smoke and no toxic halogen gases, reducing the risk to human life and equipment. Both sheath materials are extruded in a uniform 3.0mm thickness, forming a tough, smooth outer layer that resists cracking and tearing.

Style and Structure: The cable has a distinctive rigid, cylindrical shape with a uniform outer diameter of 65mm. The three 95mm² insulated conductors and one 70mm² insulated conductor are twisted together in a helical pattern to form a compact core, which is then wrapped with the shielding layer. The outer sheath is extruded over the shielding, encapsulating the entire assembly to form a cohesive unit. This twisted design ensures even distribution of stress throughout the cable, enhancing its mechanical stability. The outer surface of the sheath is marked at regular intervals (every 500mm) with essential information, including the cable type (e.g., Rvfv-K), specification (3X95+70 mm²), rated voltage (U-1000V), manufacturer’s logo, and production date, using durable ink that remains legible throughout the cable’s service life.

The overall material selection and structural design of the cable balance performance, durability, and cost, making it a reliable choice for demanding applications where both power transmission and anti-interference capabilities are essential.

The manufacturing of the Rigid Shielded Cable U-1000 series 3X95+70 mm² involves a series of precision-engineered processes, each designed to ensure the final product meets strict quality standards for electrical performance, mechanical strength, and shielding effectiveness.

Conductor Manufacturing: The process begins with high-purity electrolytic copper rods (99.95% purity), which are inspected for impurities and surface defects. The rods are first cleaned using a chemical bath to remove oxides and contaminants, ensuring optimal conductivity. They are then drawn through a series of diamond dies in a wire drawing machine, reducing their diameter from 8mm to thin wires (typically 0.4-0.6mm in diameter). This drawing process increases the wire’s tensile strength while maintaining its conductivity. The drawn wires undergo annealing in a controlled nitrogen atmosphere furnace at 500-600℃, a heat treatment that relieves internal stresses and restores ductility, ensuring the wires can be stranded without breaking.

For the 95mm² and 70mm² conductors, multiple annealed wires are stranded together using a compact stranding machine. This machine twists the wires in layers around a central wire, applying pressure to compact the strands into a dense, circular cross-section. The 95mm² conductor typically consists of 61 strands of 0.4mm wire, while the 70mm² conductor uses 49 strands of the same diameter. Compact stranding enhances the conductor’s current-carrying capacity by reducing air gaps, improves heat dissipation, and increases mechanical strength.

Insulation Extrusion: Each Stranded Conductor is fed into an insulation extrusion line, where either PVC or XLPE insulation is applied. For PVC Insulation (Rvfv, Rvfv-K), PVC pellets are first dried in a hot air dryer to remove moisture (moisture content <0.05%), as moisture can cause voids in the insulation. The dried pellets are fed into a single-screw extruder, melted at 160-180℃, and forced through a crosshead die that shapes the insulation around the conductor to a uniform thickness of 2.5mm. The insulated conductor is cooled in a water bath to solidify the PVC, then passed through a laser diameter gauge to verify insulation thickness and uniformity.

For XLPE insulation (Vvfv, Vvfv-K), the process is similar but includes a cross-linking step. XLPE pellets are dried and melted in an extruder, then extruded over the conductor. The insulated conductor is then passed through a vulcanization tube, where it is exposed to high temperature (200-250℃) and pressure, causing the polyethylene molecules to cross-link into a three-dimensional structure. This cross-linking is critical for enhancing XLPE’s thermal and mechanical properties. After cross-linking, the conductor is cooled and inspected.

Cabling: The four insulated conductors (three 95mm² and one 70mm²) are gathered and fed into a cabling machine, where they are twisted together at a specific lay length (typically 12-15 times the cable diameter). This twisting ensures the cable has a round, stable shape and prevents conductor movement during installation. A non-hygroscopic filling material (polypropylene rope) is added between the conductors to fill gaps, ensuring a compact core. A polyester binding tape is wrapped around the twisted cores to hold them together and provide a smooth surface for the shielding layer.

Shielding Application: For standard models (Rvfv, Vvfv), a 0.3mm thick copper tape is helically wrapped around the bound cores using a shielding machine, with an overlap of 15-20% to ensure continuous coverage. The tape is tinned after wrapping to prevent oxidation. For K-models (Rvfv-K, Vvfv-K), the process is twofold: first, a layer of aluminum foil (with a conductive adhesive layer) is wrapped around the cores, then a tinned copper braid (85% coverage) is applied over the foil using a braiding

machine. The braiding machine interlocks copper wires to form a flexible mesh, ensuring uniform coverage and electrical continuity. The aluminum foil is grounded at both ends to maximize shielding efficiency, creating a Faraday cage effect that traps electromagnetic fields.

Sheath Extrusion: After shielding, the cable core is fed into a sheath extrusion line. For rigid PVC sheaths, PVC pellets are mixed with additives (such as UV stabilizers and flame retardants) and dried to remove moisture. The mixture is melted in a twin-screw extruder at 170-190℃ and extruded over the shielded core, forming a 3.0mm thick outer layer. The extrusion die is designed to ensure the sheath adheres tightly to the shielding, preventing water ingress and mechanical separation. For LSZH sheaths, a halogen-free polymer compound is used, processed at slightly higher temperatures (180-200℃) to achieve proper flow and adhesion. The Sheathed Cable is cooled in a water bath and then passed through a haul-off machine to maintain uniform tension, ensuring consistent sheath thickness.

Quality Testing: Every cable undergoes rigorous testing before leaving the factory. Electrical tests include insulation resistance measurement (using a 1kV megohmmeter, with a minimum value of 1000MΩ·km), AC withstand voltage testing (3kV for 5 minutes without breakdown), and shielding effectiveness testing (using a network analyzer to verify ≥85dB at 100MHz). Mechanical tests evaluate tensile strength and elongation of the sheath (PVC: ≥12MPa tensile strength, ≥150% elongation; LSZH: ≥10MPa, ≥120%), as well as impact resistance (using a drop weight test to ensure no cracks form). Dimensional checks verify conductor size, insulation and sheath thickness, and overall outer diameter. A sample from each production batch is also subjected to accelerated aging tests (exposure to 105℃ for 168 hours) to confirm long-term performance stability.

Spooling and Labeling: Passed cables are spooled onto wooden or steel reels, with lengths typically ranging from 100m to 500m depending on customer requirements. The reels are fitted with flanges to prevent cable damage during handling, and steel straps secure the cable to the reel. Each reel is labeled with the cable type, specification, length, batch number, production date, and compliance marks (such as CE or UL), ensuring full traceability.

The packaging of the Rigid Shielded Cable U-1000 series 3X95+70 mm² is engineered to protect the cable during storage, transportation, and handling, preserving its structural and electrical integrity.

For bulk orders, the cable is wound onto heavy-duty wooden reels with a diameter of 1200mm-1500mm, depending on the cable length. The reels are constructed from pressure-treated pine wood to resist rot and insect infestation, compliant with ISPM 15 standards for international shipping. The cable is wrapped in a moisture-resistant polyethylene film before winding, and a layer of non-woven fabric is placed between cable layers to prevent abrasion. Steel bands (40mm wide) are tightened around the reel flanges to secure the cable, with corner protectors to avoid flange damage. Each reel is fitted with a metal core for easy lifting with forklifts or cranes, and a weatherproof tag is attached to the flange, detailing the cable specifications, length, batch number, and safety instructions.

For shorter lengths (20m-50m), the cable is coiled into a circular shape with a diameter of 600mm, wrapped in thick PVC film, and placed in a corrugated cardboard box reinforced with wooden planks. The box interior is lined with foam padding to absorb shocks, and the cable ends are sealed with heat-shrink caps to prevent moisture ingress. The box exterior is printed with handling symbols (e.g., "Do Not Drop," "Keep Dry") and product information.

Sample cables (1m-5m) are packaged in rigid plastic cases with foam inserts to prevent bending or kinking. Each sample includes a technical data sheet and a certificate of compliance, ensuring customers can verify specifications and performance.

For international shipments, all packaging is marked with the consignee’s details, port of destination, and a packing list. Wooden reels are stamped with the ISPM 15 logo, and containers are fitted with humidity indicators to monitor environmental conditions during transit.

Transportation of the Rigid Shielded Cable U-1000 series is managed to minimize mechanical stress and environmental exposure, ensuring the cable arrives in optimal condition.

Land Transportation: For domestic deliveries, flatbed trucks with air suspension systems are used to transport reels, reducing vibration damage. Reels are secured using ratchet straps (rated at 5000kg) attached to truck bed anchor points, with wooden chocks placed between reels to prevent shifting. For boxed cables, enclosed vans with climate control (15℃-25℃) are preferred, especially for LSZH-sheathed models sensitive to extreme temperatures. Drivers receive training on cable handling protocols, including maximum acceleration/deceleration limits and prohibited routes with excessive bumps or sharp turns.

Sea Transportation: When shipping overseas, reels are loaded into 20ft or 40ft shipping containers, positioned upright and secured to container walls using steel braces. Dunnage (wooden blocks) is placed under reels to distribute weight evenly, and desiccant bags are added to control humidity (maintaining <60% relative humidity). Containers are fitted with ventilation systems to prevent condensation, and cable reels are covered with UV-resistant tarps to shield from direct sunlight during loading/unloading.

Rail Transportation: For long-distance inland shipments, railcars with flatbeds or enclosed containers are used. Reels are secured using the same methods as truck transport, with additional bracing to withstand rail vibrations. Rail operators provide real-time tracking, allowing customers to monitor shipment progress and anticipate delivery times.

Handling Guidelines: During loading/unloading, forklifts with reel handlers are used, avoiding direct contact with the cable sheath. Crane lifting is permitted only using the reel’s central core, with slings padded to prevent flange damage. Cables must never be dragged across the ground, as this can abrade the sheath or damage the shielding.

The shipment process is streamlined to ensure efficiency, transparency, and on-time delivery, with clear protocols for order processing and customer communication.

Order Processing: Upon receiving an order, the sales team confirms specifications (model, length, sheath material) and checks inventory. In-stock items are processed within 48 hours; custom orders (e.g., LSZH sheaths or special lengths) take 7-10 business days, with production updates provided to the customer weekly.

Documentation: Each shipment includes a commercial invoice, packing list, certificate of conformity (stating compliance with IEC 60502-1), and test reports for the batch. For international orders, additional documents include a bill of lading, customs declaration, and material safety data sheet (MSDS) for sheath compounds.

Tracking and Notification: Customers receive a tracking number via email once the shipment departs, linked to a real-time logistics platform showing location and estimated delivery. For critical projects, a dedicated account manager provides daily updates. Delivery is scheduled in advance, with a 24-hour notice to ensure the recipient is available to inspect the goods.

Delivery Inspection: Upon arrival, the customer is advised to check reel/flange condition, cable labeling, and overall length against the packing list. Any damage must be noted on the delivery receipt, with photos taken as evidence. The manufacturer’s logistics team assists in filing damage claims with carriers, arranging replacements within 48 hours for urgent cases.

Sample provision is a key part of customer service, allowing clients to verify cable performance before placing bulk orders.

Sample Requests: Customers can request samples via the company website, email, or phone, specifying the model (e.g., Vvfv-K) and required length. Samples are provided free of charge for qualified customers (e.g., registered contractors, industrial buyers), with shipping costs covered by the manufacturer for orders within the same region.

Sample Preparation: Samples are cut from production batches that pass all quality tests, ensuring they represent typical product quality. Each sample is labeled with the batch number, production date, and specifications, and accompanied by a test report detailing insulation resistance, shielding effectiveness, and dimensional checks.

Delivery: Samples are shipped via express courier (e.g., DHL, FedEx) with tracking, arriving within 3-5 business days for domestic destinations and 7-10 days internationally. A follow-up email is sent with installation guidelines and contact details for technical support.

Feedback Integration: Customer feedback on samples (e.g., flexibility, shielding performance) is reviewed by the R&D team, with any issues addressed before bulk production. This iterative process ensures the final product meets specific application needs.

The manufacturer provides comprehensive after-sales support to maximize cable performance and customer satisfaction throughout the product lifecycle.

Technical Support: A team of engineers is available 24/7 to assist with installation queries, including guidance on proper bending techniques (adhering to the 975mm minimum radius), shielding grounding methods (using copper lugs for K-models), and termination procedures (recommending heat-shrink cable joints for outdoor use). On-site support is available for large projects, with engineers conducting pre-installation audits and training for electricians.

Warranty Coverage: The cable comes with a 5-year warranty against manufacturing defects, including insulation breakdown, shielding failure, or sheath cracking under normal operating conditions. Warranty claims are processed within 48 hours, with replacements or repairs provided at no cost. Proof of purchase and installation records may be required to validate claims.

Maintenance Services: For industrial clients, the manufacturer offers annual maintenance checks, including insulation resistance testing, shielding continuity verification, and visual inspection of sheath condition. Reports are provided with recommendations for preventive maintenance (e.g., re-tightening terminations, replacing damaged sections).

Recall and Replacement: In the unlikely event of a product defect affecting safety, the manufacturer initiates a recall, contacting all affected customers via phone and email. Replacement cables are shipped priority, with installation assistance provided free of charge.

Customer Feedback: A dedicated feedback portal allows customers to report issues, request support, or suggest improvements. Feedback is analyzed quarterly, with actionable insights used to enhance production processes, packaging, or service offerings.

In conclusion, the Rigid Shielded Cable U-1000 series 3X95+70 mm² combines advanced materials, precision manufacturing, and comprehensive support to deliver reliable performance in demanding environments. From production to after-sales service, every link is designed to ensure the cable meets the highest standards of quality, safety, and efficiency.