VV cable is defined as a low-voltage power cable featuring copper conductors, PVC insulation, and a PVC outer sheath; it is widely used in indoor fixed-installation power transmission and distribution systems where there are no stringent requirements for fire resistance or high-temperature tolerance. Utilizing a dual-layer PVC composite structure paired with high-conductivity copper cores, this cable is positioned as a general-purpose power distribution cable suitable for standard electrical circuits in civil buildings, factory interiors, and shopping malls.

The layered internal structure, proceeding outward from the conductor, is as follows:

1. T2-grade annealed, compacted, and stranded copper conductor: Offers low resistivity and stable, long-lasting electrical conductivity.
2. PVC core insulation layer: Formed by the uniform extrusion of PVC insulating material with consistent wall thickness, ensuring reliable dielectric strength.
3. Non-hygroscopic flexible filler material: Fills internal voids to create a circular cable profile and minimizes heat accumulation within internal air pockets.
4. Wrapping separator tape: Separates the filler layer from the outer sheath, preventing frictional damage during cable pulling and installation.
5. PVC outer sheath: General-purpose ST1-grade PVC compound offering crush resistance, moisture protection, and mold resistance, making it suitable for enclosed indoor installation environments.

Implementation Standards: GB/T 12706.1 and GB/T 2952; fully compliant with GB 50217 "Code for Design of Electric Power Systems for Civil Buildings" and standard acceptance specifications for municipal power distribution projects.

Product Positioning: Distinct from aluminum-core VLV cables (economical outdoor trunk lines), fire-resistant NH-YJV cables (fire emergency circuits), and XLPE-insulated YJV cables (high-load, long-service-life applications), VV-type cables are positioned for low-cost, standard indoor power supply; they are suitable for general lighting, power outlets, and distribution circuits for non-critical equipment.

• Mainstream models: 0.6/1 kV (covering over 98% of indoor civil and general industrial facility power distribution projects)
• Customizable low-voltage options: 0.3/0.5 kV, specifically for low-power control circuits and auxiliary power supplies for low-voltage systems

• Single-core VV cables: 1.5 mm² – 630 mm²
• Multi-core VV cables: 2-core, 3-core, 4-core, and 5-core, as well as composite configurations (e.g., 3+1, 3+2, 4+1); cross-section range: 1.5 mm² – 400 mm²
• Conductor material standard: High-purity T2 oxygen-free copper; utilizes a Class 2 compacted stranded structure to effectively reduce DC resistance and optimize current transmission efficiency

• Long-term continuous operating temperature: 70°C (suitable for standard indoor ambient temperatures).
• Maximum withstand temperature during short-circuit: Withstands 160°C for up to 5 seconds (prevents instantaneous dielectric breakdown during short-circuit faults).
• Minimum installation bending radius: 10 times the outer diameter for multi-core VV cables; 12 times the outer diameter for large-cross-section single-core VV cables.
• Installation ambient temperature requirements: Normal installation allowed at 0°C or above; pre-heating required if the ambient temperature is below 0°C to prevent PVC sheath cracking.
• Factory withstand voltage test standard: Finished cables must withstand 3.5 kV AC voltage for 5 minutes without breakdown; batch sampling is conducted prior to shipment.

• Small cross-section (1.5–10 mm²): Indoor lighting branch circuits, wall socket wiring, power supply for small equipment.
• Medium cross-section (16–185 mm²): Floor-level power distribution feeders, power input lines for individual workshop equipment.
• Large cross-section (240–630 mm²): Main feeder lines from building transformer rooms, main distribution circuits for factory sites.

Utilizing a standard T2-grade oxygen-free, compacted stranded copper core, the cable offers resistivity far lower than that of aluminum-core VLV cables. For indoor distribution lines spanning short to medium distances (up to 300 meters), voltage drop is kept at minimal levels, fully complying with national standards for permissible design deviations. There is no need to increase the conductor cross-sectional area to compensate for conductive losses, thereby reducing material costs for small-to-medium-sized distribution circuits.

The dual-layer PVC insulation and sheath form a fully sealed cable structure, offering excellent resistance to moisture, mold, and dust. It is ideal for fully enclosed installation environments—such as enclosed basement cable trenches, indoor cable shafts, conduits embedded in walls, and indoor cable trays—effectively isolating internal components from indoor humidity and dust to slow the rate of aging.

The multi-core VV cable features moderate overall rigidity and a small minimum bending radius, facilitating routing, crossovers, and conduit threading within narrow wall conduits and compact cable shafts. Compared to rigid single-core cables, it significantly reduces the pulling effort required by installers and shortens the wiring installation timeline for large-scale indoor renovation and electrical retrofit projects.

Its raw material costs are lower than those of XLPE-insulated YJV series cables, while its electrical conductivity stability is far superior to that of aluminum-core VLV cables. For ordinary commercial buildings, residential public areas, and power circuits in standard factory workshops—where there are no requirements for heavy loads or special fire resistance—VV cables strike an excellent balance between procurement cost and operational stability, making them the preferred standard cable for conventional, low-budget indoor electrical designs.

The PVC outer sheath features a smooth surface, with specifications and model designations clearly marked via permanent laser printing, enabling engineers to quickly identify cable specifications during construction acceptance. The PVC insulation layer is easy to strip and does not adhere to the copper core; this enhances the efficiency of terminal crimping and wiring operations while reducing the risk of poor terminal contact caused by residual insulation material.

VV cables are mature, standardized, mass-produced products manufactured using a highly stable extrusion process. Variations in electrical performance between production batches are strictly controlled within the tightest limits of industry standards, effectively preventing safety hazards—such as inconsistent current-carrying capacity—that could arise from product quality instability during large-scale construction projects.

• Standard indoor power distribution for residential buildings
  Indoor socket circuits, public corridor lighting, auxiliary power for elevator machine rooms, and general lighting wiring for underground garages
• General indoor power circuits for commercial complexes
  Lighting for retail stores, power supply for public areas in malls, branch circuits for office building floors, and power supply for supermarket equipment
• Indoor wiring for general industrial facilities
  Power supply for standard production workshop equipment, distribution circuits for office buildings, warehouse lighting, and feeder lines for non-high-temperature auxiliary equipment
• Non-fire-related emergency circuits in public areas of schools and hospitals
  Classroom lighting, standard patient room sockets, library public lighting, and power distribution for office equipment
• Electrical renovation projects for older residential communities
  Replacement of indoor wiring, outgoing lines from basement distribution boxes, and renewal of aging cables in public areas

1. Case 1: Electrical Retrofit Project for an 18-Story Residential Complex

   The design team selected the full range of VV 0.6/1kV multi-core cables for all power distribution circuits within individual units and public areas. Compared to a YJV-based solution, the total cable procurement cost for the project was reduced by 28%. We provided comprehensive factory inspection reports and technical data sheets on current-carrying capacity, assisting the construction team in passing the inspection by the competent authorities on the first attempt. The flexible cable structure significantly improved the efficiency of pulling cables through existing wall conduits, allowing the entire building's electrical retrofit project to be completed eight days ahead of schedule.

2. Case 2: Indoor Electrical Infrastructure Project for a Large Shopping Mall

   The electrical engineer for the general contractor selected VV 3x70 and VV 4x120 medium-cross-section cables for the main power distribution lines on each floor. The cables' dual-layer PVC moisture-resistant structure was well-suited to the consistently humid environment of the mall's underground levels; no insulation aging failures were detected after three years of operation. We provided customized cut-to-length services based on the floor wiring layout, eliminating material waste caused by on-site cutting and further controlling the project's total budget for electrical materials.

3. Case Study 3: Indoor Power Distribution Project for Standard Factory Building (Phase I)

   The design team selected large-cross-section VV 4×185 copper-core cables as the main power supply lines for the workshop. Leveraging the low resistivity of copper, the voltage drop across the 260-meter indoor main line fully met design specifications, eliminating the need for additional costs associated with increasing the cable cross-section. Our technical team assisted the purchaser in preparing the technical bid response, ensuring that all parameters fully complied with the tender requirements, thereby effectively increasing the contractor's chances of winning the bid.

• Voltage Rating Matching Principles: Standard 0.6/1kV VV-type cables are used for all conventional indoor fixed installations; custom 0.3/0.5kV specifications are used only for low-power control branch circuits.
• Cross-Section Selection Logic: Given the stable conductivity of copper cores, the required cross-section is calculated based on total load power, with a 10% load margin reserved for future equipment expansion; there is no need to deliberately oversize the cross-section as is required with aluminum-core VLV cables.
• Core Count Matching Rules: 3-core VV cables are selected for single-phase lighting and socket circuits; 4-core cables are used for three-phase balanced power mains; and 3+1 or 4+1 composite-core VV series cables are used for equipment requiring independent grounding.
• Usage Limitations: The maximum continuous operating temperature for VV-type cables is 70°C; they are unsuitable for high-temperature environments such as kiln workshops, boiler rooms, or fire emergency power circuits. High-temperature resistant cables (e.g., YJV or NH-YJV) should be selected for such applications. Long-term direct burial outdoors is not recommended; VLV aluminum-core cables are preferred for outdoor projects.

• Conduit Installation Requirements: Prevent sharp edges at conduit openings from scratching the PVC outer sheath; install protective plastic bushings at entry and exit points. When installing multiple cables in a single conduit, ensure sufficient clearance for heat dissipation.
• Bending Control: Strictly adhere to minimum bending radius standards; excessive bending can cause creases in the internal PVC insulation, thereby compromising long-term insulation safety.
• Dense Installation in Cable Shafts: Maintain a 20% heat dissipation gap between bundled VV cables; dense stacking leads to heat accumulation and reduces the actual effective current-carrying capacity.
• Environmental Limitations: Avoid prolonged immersion in strong acid or strong alkali liquids; when installing in chemical storage areas, fully enclosed metal conduits must be used for isolation and protection.

• Pre-order qualification verification: Confirm that the supplier can provide the production license, quality certificates for raw materials (copper ingots), and type test reports for the finished cables.
• On-delivery spot checks: Inspect the laser-printed model designation (VV 0.6/1kV) on the outer sheath for completeness; examine the surface finish of the copper cores and the uniformity of the insulation layer thickness. For large-scale tender projects, samples may be taken for re-testing of withstand voltage performance.
• Delivery schedule planning: For bulk orders involving medium-to-large commercial projects or factory renovations, orders must be placed 5–10 working days in advance to allow sufficient time for production and batch inspection, thereby preventing construction delays caused by cable shortages.

• Compliance with national standards: All VV-type cables are manufactured in strict accordance with the GB/T 12706.1 standard; they comply with national code requirements for the electrical design, installation, and acceptance of civil buildings, and meet the audit criteria set by construction quality supervision authorities.
• Comprehensive Batch Documentation: Factory inspection reports, certificates of conformity for copper raw materials, packing lists, special VAT invoices, and technical specification compliance sheets are provided for every product batch, facilitating the submission of documentation required for project filing and acceptance.
• Support for Authoritative Third-Party Testing: Products have passed inspections by nationally recognized electrical testing institutions; official test reports are available for review and filing by competent construction authorities and project supervision agencies.
• Batch Quality Consistency Control: Uniform copper raw materials and PVC formulations are used across all production batches to ensure stable electrical performance, eliminating the risk of project acceptance failure caused by quality inconsistencies between cable batches.

An extensive product range is available, covering everything from small-cross-section branch cables (1.5mm²) to large-cross-section single-core trunk cables (630mm²); ample stock of standard models ensures rapid delivery. We support customized composite core configurations, cut-to-length services, and the printing of project-specific markings on outer sheaths, enabling one-stop, centralized procurement of standard indoor power cables without the need to coordinate with multiple suppliers.

We utilize only premium-grade T2 oxygen-free copper ingots (avoiding recycled mixed copper) paired with highly stable PVC insulation and sheathing materials. By implementing a three-stage quality control process—comprising incoming raw material inspection, in-line monitoring of semi-finished products, and withstand-voltage spot checks on finished cables—we effectively eliminate common defects found in products from smaller manufacturers, such as excessively thin insulation, impurities in the copper core, and brittle or crack-prone sheathing.

Our direct sales model eliminates intermediary markups and offers tiered pricing discounts for large-volume engineering orders. Our in-house electrical engineers provide complimentary load calculations and wire gauge optimization advice, helping clients select the most cost-effective cable specifications; this ensures design standards are met while further minimizing the project's total electrical material costs.

Our senior cable engineers provide full-lifecycle technical support to design institutes and engineering contractors. Services include consulting on indoor power distribution circuit design, providing current-carrying capacity charts for VV cables, optimizing on-site installation plans, and assisting with the review and organization of technical specifications for tenders. For large-scale commercial and industrial facility projects, we assist in preparing parameter compliance statements that meet tender requirements, thereby enhancing the overall competitiveness of the bid proposal.

The company operates multiple automated continuous extrusion production lines capable of producing tens of thousands of meters of VV cable daily, backed by substantial raw material inventories. Even when handling high-volume orders—such as those for large-scale community renovations or industrial facility infrastructure—we guarantee on-time delivery, effectively mitigating the risk of work stoppages caused by supply chain shortages.

All delivered VV cables come with a 10-year manufacturer's quality warranty. Should any technical issues regarding installation arise on-site, our technical team provides remote video guidance within 24 hours; for long-term partner general contractors and design firms, we can arrange on-site technical guidance services upon request. We maintain dedicated profiles for long-term clients and pre-stock inventory based on project schedules, thereby shortening delivery times for subsequent reorders.

The VV-type copper-core, PVC-insulated power cable represents the most cost-effective, general-purpose wiring solution for standard fixed indoor power distribution circuits in residential complexes, commercial developments, industrial facilities, and public buildings. Featuring high-conductivity copper cores, ease of installation, a dual-layer PVC structure that provides indoor moisture and dust resistance, and quality that fully complies with national standards, this product perfectly addresses the core priorities of electrical engineers and procurement managers: ensuring the long-term, stable operation of indoor power systems while effectively controlling material costs.

As a specialized manufacturer of standardized, full-specification VV cables holding comprehensive production qualifications, we offer integrated services that combine standardized cable supply, full documentation support for project acceptance, and professional electrical technical consulting. We are dedicated to serving global electrical design institutes, general contractors, and bulk purchasers, helping indoor power distribution projects successfully pass official inspections and optimizing the lifecycle operating costs of power circuits.