Bvr Yellow Green Ground Earth Cable H07vk 6/10/35/50/70mm2 Single Core Copper PVC Insulated Flexible Electric Wire

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2025-09-11 07:31:47

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Comprehensive Guide to BVR Yellow Green Ground Earth Cable H07VK: Single Core Flexible Copper PVC Insulated Electric Wire

1. Product Specifications and Core Attributes

The BVR Yellow Green Ground Earth Cable, compliant with the H07VK standard, is a specialized safety cable engineered for protective earthing and grounding systems across residential, commercial, and industrial sectors. Designed to divert fault currents safely to the earth, this single-Core Cable combines high conductivity, Flexibility, and durability, making it a critical component in electrical safety infrastructure. Available in conductor sizes from 6mm² to 70mm², it adheres to stringent international standards, ensuring reliable performance in diverse environmental conditions.

Electrical and Mechanical Specifications

Conductor Configuration: Single core with a stranded Copper Conductor, available in cross-sectional areas of 6mm², 10mm², 35mm², 50mm², and 70mm². The overall cable diameter ranges from 8mm (6mm²) to 18mm (70mm²), depending on conductor size and insulation thickness.

Current-Carrying Capacity:

6mm²: 32A (free air) / 25A (conduit)

10mm²: 42A (free air) / 34A (conduit)

35mm²: 95A (free air) / 77A (conduit)

50mm²: 115A (free air) / 94A (conduit)

70mm²: 145A (free air) / 118A (conduit)

Note: Ratings based on 30°C ambient temperature; derate by 10% for every 5°C increase above 30°C.

Voltage Rating: 450/750V, suitable for low-voltage grounding systems in accordance with IEC 60364 and NFPA 70 (NEC) standards.

Temperature Range:

Continuous operation: -25°C to 70°C

Short-term overload: Up to 105°C for 5 seconds (e.g., during fault conditions)

Mechanical Properties:

Minimum bend radius: 4× cable diameter (static installation); 6× (dynamic flexing)

Tensile strength: ≥12N/mm² (conductor); ≥10N/mm² (PVC Insulation)

Impact resistance: Withstands 20J impact (per IEC 60811-1-2) without insulation damage

Electrical Performance:

Conductor resistance: ≤1.83Ω/km (6mm²) to ≤0.268Ω/km (70mm²) at 20°C

Insulation resistance: ≥100MΩ at 500V DC (after 24-hour immersion in water)

Dielectric strength: 3kV for 1 minute (no breakdown)

2. Material Composition and Design

The BVR Yellow Green Ground Earth Cable’s performance is rooted in its precision-engineered materials, each selected to optimize conductivity, protection, and flexibility:

Conductor: High-Purity Stranded Copper

The core conductor is crafted from 99.9% pure electrolytic copper, processed to ensure low resistance and high flexibility:

Copper Purity: 99.9% purity guarantees electrical conductivity of ≥97% IACS (International Annealed Copper Standard), minimizing impedance for efficient fault current diversion. This is critical, as grounding systems require low-resistance paths to rapidly dissipate fault currents (often exceeding 1000A) to the earth.

Stranding Design:

6mm²: 50–60 fine strands (0.3mm diameter each)

10mm²: 80–90 strands

35mm²: 120–150 strands

50mm²: 180–200 strands

70mm²: 250–280 strands

The fine-stranded structure distributes mechanical stress during bending, twisting, or vibration, preventing conductor fatigue—essential for installations in dynamic environments (e.g., near industrial machinery or vibrating equipment).

Surface Treatment: Optional tin plating (5–10μm thick) for enhanced corrosion resistance in humid or coastal environments, preventing oxidation that could increase resistance over time.

Insulation: Flame-Retardant PVC

The conductor is insulated with a high-grade polyvinyl chloride (PVC) compound, formulated to meet H07VK requirements:

PVC Formulation: Blended with flame retardants (e.g., aluminum trihydroxide), plasticizers, and stabilizers to resist heat, moisture, and chemicals. This ensures the insulation remains intact in temperatures up to 70°C and resists degradation from oils, greases, and mild acids.

Insulation Thickness:

6mm²: 0.8mm

10mm²: 1.0mm

35mm²: 1.2mm

50mm²: 1.4mm

70mm²: 1.6mm

The uniform thickness guarantees dielectric strength, preventing arcing between the conductor and adjacent metal surfaces.

Color Coding: The insulation is permanently colored with a yellow-green stripe pattern—globally recognized under IEC 60446 as the identifier for protective grounding conductors. This eliminates installation errors, ensuring the cable is correctly connected to earth electrodes or grounding bars.

Additional Design Features

UV Resistance: PVC insulation contains UV stabilizers, making the cable suitable for outdoor installations (e.g., grounding solar panels or outdoor substations) without degradation from sunlight.

Oil Resistance: Resistant to mineral oils and petroleum-based fluids, expanding its use in industrial settings (e.g., factories with lubricant exposure).

3. Specialized Applications

The BVR Yellow Green Ground Earth Cable is purpose-built for safety-critical grounding applications, where reliable fault current diversion is essential:

Residential and Commercial Buildings

Distribution Boards: Connects main electrical panels to earth electrodes, ensuring fault currents from short circuits are diverted away from occupants. The 6mm² and 10mm² sizes are standard for home and apartment buildings.

Appliance Grounding: Used to ground metal enclosures of refrigerators, air conditioners, and washing machines, preventing electric shock if Internal Wiring faults occur.

Lighting Systems: Grounds metal light fixtures and ceiling fans, particularly in damp locations (bathrooms, kitchens) where moisture increases shock risks.

Industrial Facilities

Heavy Machinery: Grounds manufacturing equipment (e.g., CNC machines, presses, and conveyors) to protect operators from electric shock and prevent equipment damage during faults. The 35mm² to 70mm² sizes handle high fault currents in industrial grids.

Welding Stations: Diverts stray currents from welding equipment, preventing arcing that could damage sensitive electronics or cause fires.

Chemical Plants: Resists exposure to mild chemicals, making it suitable for grounding tanks, pipelines, and processing equipment in corrosive environments.

Power Distribution and Utilities

Substations: Connects transformers, switchgear, and circuit breakers to earth grids, ensuring safe dissipation of fault currents during grid disturbances.

Renewable Energy Installations: Grounds solar panel arrays and wind turbines, protecting against lightning strikes and equipment faults. The UV-resistant insulation withstands outdoor conditions.

Railway Systems: Grounds tracks, signaling equipment, and traction power systems, preventing stray currents from damaging infrastructure or endangering passengers.

Construction and Temporary Sites

Temporary Grounding: Used with portable generators, scaffolding, and power tools on construction sites, where temporary electrical systems pose heightened safety risks.

Event Venues: Grounds temporary lighting, sound systems, and food service equipment at concerts, festivals, or sports events, ensuring public safety.

4. Manufacturing Process

The production of BVR Yellow Green Ground Earth Cable adheres to strict quality controls to meet H07VK and international standards:

Conductor Production

Copper Drawing: Raw copper rods (99.99% pure) are drawn through diamond dies to form fine wires (0.3mm diameter). This process increases tensile strength while maintaining conductivity.

Annealing: Wires are heated to 400–600°C in a nitrogen atmosphere to soften the metal, enhancing flexibility for stranding.

Stranding: Wires are twisted into conductors using high-speed stranding machines. The lay length (twist spacing) is set to 15–20× the wire diameter to balance flexibility and structural stability.

Tin Plating (Optional): Stranded Conductors are electroplated in a tin sulfate bath, ensuring uniform coverage to resist corrosion.

Insulation Extrusion

PVC Compounding: PVC resin is mixed with flame retardants, plasticizers, and yellow-green pigments in a high-shear mixer to form a homogeneous compound.

Extrusion: Conductors are fed through an extruder, where molten PVC is applied at 160–180°C to form the insulation layer. Precision dies ensure uniform thickness across the conductor.

Cooling and Curing: Insulated Conductors pass through a water bath to cool and solidify the PVC, followed by a drying process to remove surface moisture.

Quality Testing

Conductivity Test: Using a Kelvin bridge to verify resistance meets IACS standards.

Insulation Tests:

Dielectric strength test: 3kV applied for 1 minute to check for breakdown.

Insulation resistance test: Measured at 500V DC to ensure ≥100MΩ.

Mechanical Tests:

Flex test: 10,000 cycles of bending (at 4× bend radius) to check for conductor or insulation damage.

Impact test: A 20J weight is dropped on the cable to verify insulation integrity.

Flame Retardancy Test: Vertical flame test per UL 94 to confirm self-extinguishing properties (V-0 rating).

Color Verification: Spectrophotometric analysis ensures the yellow-green stripe meets IEC 60446 color standards.

5. General Product Information

Packaging

Reels: Cables are wound onto wooden or steel reels with flanges, available in lengths of 100m, 250m, 500m, or 1000m. Reel sizes vary by conductor size:

6mm²–10mm²: 30cm–50cm diameter reels

35mm²–70mm²: 60cm–100cm diameter reels

Protection: Reels are wrapped in UV-resistant plastic film to prevent moisture and dust ingress. Each reel is labeled with:

Product code (BVR H07VK)

Conductor size (e.g., 10mm²)

Length

Batch number

Compliance marks (CE, IEC, etc.)

Documentation: Each reel includes a certificate of conformity (CoC) with test results, material specifications, and compliance statements.

Transportation and Handling

Shipping Modes: Available via road (trucks with reel lifts), sea (container shipping for international orders), or air (for urgent deliveries).

Handling Guidelines:

Reels must be moved with forklifts or cranes using reel hooks—never dragged, as this can damage the insulation or conductor.

Cables should be stored horizontally in a dry, ventilated area, away from direct sunlight, extreme temperatures (-25°C to 50°C), and chemicals.

Unused cable must be rewound tightly to prevent kinking, which can degrade insulation over time.

Storage Life: 5 years from manufacture when stored under recommended conditions, with no degradation in electrical or mechanical properties.

Sample Provision

Sample Availability: Free 1m–5m samples are available for standard sizes (6mm²–10mm²), shipped within 2–3 business days.

Custom Samples: Larger sizes (35mm²–70mm²) or tin-plated variants incur a nominal fee, with delivery within 5–7 days.

Sample Documentation: Samples include a datasheet with specifications, test reports, and compliance certifications.

Ordering and Delivery

Minimum Order Quantity (MOQ): 100m for 6mm²–10mm²; 50m for 35mm²–70mm².

Lead Times:

Standard orders: 3–5 business days

Bulk orders (10,000m+): 7–10 business days

Custom variants (e.g., tin plating): 10–14 business days

Pricing: Varies by size and quantity, with volume discounts for orders over 1000m. Prices include standard packaging and documentation.

Payment Terms: T/T, L/C, or credit card for international orders; net-30 terms for established clients.

After-Sales Support

Warranty: 5-year warranty against manufacturing defects (e.g., insulation cracking, conductor breakage under normal use). Excludes damage from improper installation, chemical exposure beyond specifications, or mechanical abuse.

Technical Assistance: A team of engineers provides guidance on:

Correct installation practices (e.g., termination methods using copper lugs)

Grounding system design (e.g., earth electrode spacing)

Compliance with local codes (e.g., NEC Article 250 in the U.S.)

Returns and Replacements: Defective products can be returned within 30 days for a full refund or replacement, provided the issue is verified with photos and the CoC.

Maintenance Recommendations:

Periodic inspections (annually) for insulation damage, corrosion, or loose connections.

Cleaning with a dry cloth; avoid harsh solvents that could degrade PVC.

Retightening terminations every 2–3 years to prevent resistance buildup.

Conclusion

The BVR Yellow Green Ground Earth Cable H07VK is a critical safety component, engineered to protect lives and equipment by diverting fault currents safely to the earth. Its high-purity Stranded Copper Conductor ensures low resistance, while flame-retardant PVC insulation and yellow-green color coding provide durability and clear identification. Available in sizes from 6mm² to 70mm², it adapts to diverse applications—from residential appliances to industrial machinery. Backed by rigorous testing, reliable packaging, and comprehensive after-sales support, this cable sets the standard for grounding systems, ensuring compliance with global safety standards and peace of mind for installers and end-users alike. Whether in new constructions, renovations, or industrial facilities, it remains an indispensable tool for maintaining electrical safety.