Bvr 4.0mm2 Stranded Copper Conductor Pvc Insulated Flexible Building Wire
Product Summary
Product Details
BVR Stranded Copper Conductor
,4.0mm2 Stranded Copper Conductor
,OEM Flexible Building Wire
Product Description
BVR 4.0mm² Stranded Copper PVC Insulated Flexible Building Wire 450/750V Easy Bend
Cable Designation & Meaning
|
Code |
Meaning |
|---|---|
|
B |
Fixed wiring (Class B, fixed installation) |
|
V |
PVC insulation |
|
R |
Flexible conductor (Class 5 fine-stranded) |
|
4.0 mm² |
Nominal conductor cross-sectional area |
Construction: Fine-stranded flexible copper conductor, PVC insulation, single-core building wire.
Applicable Standards
- GB/T 5023.3-2008 / IEC 60227-3 — Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V — Part 3: Non-sheathed cables for fixed wiring
- GB/T 3956 / IEC 60228 — Conductors (Class 5 flexible copper)
- GB/T 2951 / IEC 60811 — Insulating and sheathing materials — Common test methods
- GB/T 18380 / IEC 60332-1 — Flame retardant (single cable, passes)
- GB/T 5023.2-2008 / IEC 60227-2 — Test methods
BVR-4.0 mm² — Single-Core PVC Insulated Flexible Copper Building Wire — Specification & Engineering Data
1. Overview & Ratings. BVR-4.0 is a single-core PVC insulated flexible copper building wire rated 450/750 V, 70 °C continuous. Built per GB/T 5023 / IEC 60227. It uses a Class 5 fine-stranded copper conductor (~56×0.30 mm) for superior flexibility compared to rigid BV wire. Ideal for control panels, equipment leads, and tight conduit runs. Finished Ø ≈ 4.2 mm, ≈ 52 kg/km, supplied on 100 m coils.
2. Construction Stack (Conductor → Outer).
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Conductor | Fine-stranded annealed Cu, Class 5, 4.0 mm² | — | ≈ 3.0 mm |
| PVC insulation | Polyvinyl chloride, general-purpose | ≈ 0.9 mm | ≈ 4.2 mm (finished) |
3. Electrical Characteristics. DC resistance ≤ 4.95 Ω/km at 20 °C (flexible Cu 4.0 mm²); test voltage 2.5 kV AC / 5 min; insulation resistance ≥ 20 MΩ·km. Nominal ampacity ≈ 32 A (in conduit, 30 °C). Voltage drop ≈ 1.8 V/A·100 m.
Insulation Data
|
Property |
Value |
|---|---|
|
Material |
PVC (polyvinyl chloride) |
|
Nominal thickness |
0.8 mm |
|
Long-term service temp. |
70 °C (continuous, PVC Type TI1/TI2) |
|
Short-circuit temp. (≤5 s) |
160 °C (Cu conductor limit for PVC) |
|
Emergency overload temp. |
105 °C (short term, not recommended for continuous) |
|
Test voltage AC (5 min) |
2.0 kV (routine test, 450/750 V class) |
|
Dielectric strength |
≥ 15 kV/mm (room temp.) |
|
Volume resistivity @20 °C |
≥ 1.0×10¹² Ω·cm |
|
Hardness (Shore A) |
85–95 |
Electrical Parameters
|
Parameter |
Value |
Note |
|---|---|---|
|
Rated voltage U₀/U |
450 / 750 V |
GB/T 5023.3 / IEC 60227-3 |
|
Max. system voltage |
500 V AC (between conductors) |
— |
|
Test voltage AC (5 min) |
2.0 kV |
Routine test |
|
DC resistance @20 °C |
≤ 4.95 Ω/km |
GB/T 3956 Class 5 Cu max, 4.0 mm² |
|
AC resistance @70 °C (est.) |
≈ 6.3 Ω/km |
— |
|
Current rating in air (30 °C, single-core) |
36 A |
single-core open air, reference value |
|
Current rating in conduit (30 °C, 1-core) |
28 A |
in conduit, reference value |
|
Current rating (multi-core bundle, conduit) |
24 A |
bundled with other circuits (typical derating) |
|
Short-circuit current (1 s, Cu, 160 °C) |
≈ 0.44 kA (440 A) |
4.0 mm² Cu |
|
Frequency |
50/60 Hz AC |
— |
Reference values: 4.0 mm² Cu at 28 A (conduit), single-phase 230 V → max load ≈ 6.4 kW. Voltage drop at 28 A ≈ 176 V/km (≈7.6% per 100 m at 230 V — limit to ≤ 50 m run without upsize).
4. Thermal & Mechanical. 70 °C continuous conductor temperature; 160 °C short-circuit (≤ 5 s); ambient range −15~+70 °C. Bend ≥ 2 × OD ≈ 8 mm — very flexible. Resists metal fatigue from repeated bending.
Temperature Characteristics
|
Property |
Value |
|---|---|
|
Max. conductor operating temp. |
70 °C (continuous) |
|
Max. short-circuit temp. (≤5 s) |
160 °C (Cu conductor, PVC limit) |
|
Emergency overload temp. |
105 °C (not recommended for continuous) |
|
Min. installation ambient temp. |
0 °C (PVC); below 0 °C pre-heating required |
|
Service ambient range |
−15 °C to +70 °C (PVC insulation) |
|
Fire survival |
Standard (flame retardant single cable) |
Fire Performance (BVR — Standard)
|
Property |
Value / Requirement |
|---|---|
|
Flame retardant |
IEC 60332-1 (single cable, passes) |
|
Halogen content |
Contains halogen (PVC) |
|
Smoke density |
Standard (non-low-smoke) |
|
Corrosivity |
Corrosive (PVC) |
|
Fire survival (circuit integrity) |
Not applicable (standard version) |
5. Installation Practice & Handling. Pull into conduit or trunking. Use wire stripper carefully — fine strands cut easily. Crimp lugs rated for flexible conductors. At 52 kg/km, lightweight. Indoor use only — not for outdoor UV exposure.
Mechanical & Installation Parameters
|
Parameter |
Value |
Remarks |
|---|---|---|
|
Minimum bending radius |
≥ 4 × OD → ≈ 19 mm at Ø4.8 mm |
flexible conductor |
|
Max. pulling tension |
160 N |
fine-stranded Cu (handle gently) |
|
Direct burial |
Not recommended (no mechanical protection; use PVC conduit or cable tray) |
— |
|
Conduit ID |
≥ 1.5 × OD → ≥ 7.2 mm; use 16 mm or 20 mm conduit |
— |
|
Fixing |
cable ties, clips, conduit |
— |
|
Impact resistance |
Low (PVC insulation only) |
use conduit in exposed areas |
|
Water resistance |
Moisture-resistant (PVC) |
not waterproof; avoid prolonged immersion |
|
UV resistance |
Poor (PVC degrades in sunlight) |
indoor use only; outdoor requires UV-resistant conduit |
|
Termination note |
Strip 10–12 mm insulation; use standard screw terminals or compression lugs |
fine strands require ferrules for screw terminals |
6. Typical Service Applications. Control panel wiring, equipment leads, appliance connections, tight conduit runs, socket outlets — where flexibility and bend resistance are needed.
7. Testing & QA Regime. Routine: conductor DC resistance, 2.5 kV AC / 5 min withstand, insulation resistance, insulation thickness. Type: heating test, flexibility/bending test, flame retardancy, cold bend at −15 °C.
The Wire Parameters
| BVR-4.0 mm² — Single-Core PVC Insulated Flexible Copper Building Wire — Full Parameter Sheet | ||||
| Flexible building wire · fine-stranded copper conductor / PVC insulation · 450/750 V · 70 °C · finished Ø ≈ 4.2 mm | ||||
| Section | Parameter | Value | Unit | Remarks / Standard |
| 01 · Identification | ||||
| Cable type | BVR — single-core PVC insulated flexible copper building wire | — | Flexible fixed wiring | |
| Rated voltage (U0/U) | 450/750 | V | Building / indoor | |
| Number of cores | 1 | — | Single-core | |
| Conductor material | Annealed copper, fine-stranded | — | Class 5 flexible per GB/T 3956 | |
| Insulation material | PVC (polyvinyl chloride) | — | General-purpose | |
| Standard | GB/T 5023 / IEC 60227 | — | Building wire | |
| Application | Flexible fixed wiring, panel wiring, equipment leads | — | Building electrical | |
| Color options | Red / blue / yellow / green / black / yellow-green | — | Phase / neutral / earth | |
| Flame retardancy | Basic (PVC) | — | Self-extinguishing | |
| 02 · Conductor (Flexible Cu) | ||||
| Conductor type | Fine-stranded annealed copper | — | Class 5 flexible | |
| Conductor area | 4.0 | mm² | Single-core | |
| Stranding construction | 56 × 0.30 mm (approx.) | — | Very flexible | |
| DC resistance @ 20 °C | ≤ 4.95 | Ω/km | Cu 4.0 mm² flexible max | |
| Conductor weight per km | ≈ 39 | kg/km | 4.0 mm² Cu | |
| Conductor diameter | ≈ 3.0 | mm | Flexible | |
| 03 · Insulation | ||||
| Insulation type | PVC (polyvinyl chloride) | — | General-purpose | |
| Insulation thickness | ≈ 0.9 | mm | 450/750 V | |
| Finished outer diameter | ≈ 4.2 | mm | Overall | |
| Insulation color | Blue (shown); other colors available | — | Per order | |
| 04 · Electrical | ||||
| Rated voltage (U0/U) | 450/750 | V | Building wiring | |
| Max voltage | 750 | V | Phase-to-phase | |
| DC resistance @ 20 °C | ≤ 4.95 | Ω/km | Flexible Cu 4.0 mm² | |
| Insulation resistance | ≥ 20 | MΩ·km | PVC | |
| Test voltage (AC) | 2.5 kV / 5 min | — | Routine | |
| Nominal current (ampacity) | ≈ 32 | A | In conduit, 30 °C | |
| Voltage drop per 100 m | ≈ 1.8 | V/A·100m | At 4.95 Ω/km | |
| 05 · Thermal | ||||
| Max conductor temp. | 70 | °C | PVC rated | |
| Short-circuit temp. | 160 | °C | Max 5 s | |
| Ambient range | -15 ~ +70 | °C | Indoor | |
| Laying temperature | ≥ 0 | °C | Indoor | |
| 06 · Mechanical | ||||
| Min bending radius (fixed) | ≥ 2 × OD ≈ 8 | mm | Very flexible | |
| Flexibility | Excellent | — | Class 5 fine strands | |
| Crush resistance | Moderate | — | In conduit | |
| 07 · Installation | ||||
| Laying methods | Conduit, trunking, panel wiring, equipment leads | — | Flexible wiring | |
| Connectors | Crimp lugs / screw terminals | — | Standard | |
| Special tools | Wire stripper, crimping tool | — | Basic | |
| Bend radius | ≥ 2 × OD ≈ 8 mm | — | Very flexible | |
| 08 · Packing | ||||
| Standard supply length | 100 m / coil | m | Building wire | |
| Reel / packing type | Coil, wrapped | — | Plastic bag | |
| Surface marking | BVR, 4.0mm², 450/750V, GB/T 5023, metre marks | — | Continuous printing | |
| Storage conditions | Dry, indoor | — | Protect from moisture | |
| 09 · Applications | ||||
| Typical use | Flexible indoor wiring, control panels, appliance connections, equipment leads | — | Building electrical | |
| Max system voltage | 750 | V | 450/750 V | |
| Application level | Low voltage | — | Indoor building | |
| 10 · Color Coding | ||||
| Red | Phase L1 | — | Live | |
| Blue | Neutral N | — | Return | |
| Yellow-green | Earth PE | — | Ground | |
| Black | Phase L2/L3 | — | Alternative | |
The wire test parameters
| Test Parameters — BVR-4.0 mm² Flexible Building Wire | ||||
| No. | Test Item | Test Condition / Method | Requirement | Type |
| 1 | Conductor DC resistance | GB/T 3956, 20 °C | ≤ 4.95 Ω/km (flexible Cu 4.0 mm²) | Routine |
| 2 | Voltage test (AC) | 2.5 kV AC, 5 min | No breakdown | Routine |
| 3 | Insulation resistance | 500 V DC | ≥ 20 MΩ·km | Routine |
| 4 | Insulation thickness | Micrometer | ≥ 0.9 mm | Routine |
| 5 | Heating test | 70 °C conductor, 2 h | No damage | Type |
| 6 | Flexibility / bending test | 2× OD, repeated cycles | No damage | Type |
| 7 | Flame retardancy | IEC 60332-1 | Self-extinguishing | Type |
| 8 | Dimensional check | Micrometer / caliper | OD ≈ 4.2 mm | Routine |
| 9 | Conductor continuity | Per GB/T 3956 | All strands continuous | Routine |
| 10 | Cold bend test | -15 °C, bending | No cracking | Type |
| 11 | Strand count | Visual / microscopic | ≈ 56 strands | Routine |
| 12 | Printing legibility | Visual | Marking readable | Routine |
The wire cross section structure
| BVR-4.0 mm² — Cross-Section Construction Diagram (Schematic) | |||||
| Flexible building wire: fine-stranded Cu conductor → PVC insulation · 450/750 V · 70 °C · finished Ø ≈ 4.2 mm | |||||
| No. | Layer | Material / Construction | Nominal Thickness (mm) | Diameter (mm) | Function / Remarks |
| 1 | Conductor | Fine-stranded annealed copper, Class 5, 4.0 mm² | — | ≈ 3.0 | R ≤ 4.95 Ω/km |
| 2 | PVC insulation | Polyvinyl chloride, general-purpose | ≈ 0.9 | ≈ 4.2 (finished) | 450/750 V rated |
| Key Dimensions & Properties (expanded) | |||||
| Finished cable diameter | ≈ 4.2 | mm | Overall | ||
| Approx. cable mass | ≈ 52 | kg/km | Flexible building wire | ||
| Nominal voltage rating | 450/750 | V | Indoor building | ||
| Max conductor temp. | 70 | °C | PVC rated | ||
| Short-circuit temp. | 160 | °C | Max 5 s | ||
| Min bending radius (fixed) | ≥ 2 × OD ≈ 8 | mm | Very flexible | ||
| DC resistance @ 20 °C | ≤ 4.95 | Ω/km | Flexible Cu 4.0 mm² | ||
| Test voltage (AC) | 2.5 kV / 5 min | — | Routine | ||
| Nominal current (ampacity) | ≈ 32 | A | In conduit, 30 °C | ||
| Conductor class | Class 5 (fine-stranded) | — | Flexible | ||
| Conductor material | Annealed copper | — | High conductivity | ||
| Insulation material | PVC | — | General-purpose | ||
| Standard | GB/T 5023 / IEC 60227 | — | Building wire | ||
| Application | Flexible fixed wiring | — | Panel / equipment leads | ||
| Schematic — not to exact scale. Finished Ø ≈ 4.2 mm and weight ≈ 52 kg/km from cross-referenced industry samples. BVR-4.0 is the flexible version of BV-4.0 — same PVC insulation, but with a fine-stranded Class 5 copper conductor for improved flexibility. Values marked (est.) require confirmation against the factory test certificate. | |||||
Construction Description
| Construction Description — BVR-4.0 mm² flexible building wire | |||
| Layer-by-layer flexible building wire: fine-stranded Cu conductor / PVC insulation · 450/750 V · 70 °C · finished Ø ≈ 4.2 mm | |||
| 1. Product Identity & Ratings | |||
| BVR-4.0 is a single-core PVC insulated flexible copper building wire rated 450/750 V, 70 °C continuous. Built per GB/T 5023 / IEC 60227. It uses a Class 5 fine-stranded copper conductor (~56×0.30 mm) for superior flexibility compared to rigid BV wire. Ideal for control panels, equipment leads, and tight spaces. Finished Ø ≈ 4.2 mm, mass ≈ 52 kg/km, 100 m coils. | |||
| 2. Fine-Stranded Flexible Conductor | |||
| The conductor uses 4.0 mm² fine-stranded annealed copper (Class 5, ~56 × 0.30 mm strands). The many tiny strands make the wire highly flexible and resistant to metal fatigue from repeated bending. DC resistance ≤ 4.95 Ω/km at 20 °C — slightly higher than rigid BV due to strand gaps. | |||
| 3. PVC Insulation | |||
| PVC insulation ≈ 0.9 mm thick. Rated 450/750 V. Available in multiple colors: red (phase), blue (neutral), yellow-green (earth), black. The PVC provides basic electrical insulation and is self-extinguishing. Not UV-resistant — indoor use only. | |||
| 4. BVR vs BV Difference | |||
| BVR = flexible wire (R = soft). BV = rigid wire. BVR uses many fine strands (Class 5) vs BV's fewer thicker strands (Class 2). BVR bends easier and resists fatigue, but has slightly higher DC resistance and costs more. Choose BVR where flexibility matters — panels, equipment, tight conduit. | |||
| 5. Site Handling & Operational Notes | |||
| • Bend radius 2×OD (≈ 8 mm) — very flexible. • Pull into conduit/trunking. • Use wire stripper carefully — fine strands cut easily. • Crimp lugs rated for flexible conductors. • At 52 kg/km, lightweight. • Indoor use only. • Store dry. |
8. Standards & Conformity. GB/T 5023 (PVC insulated cables 450/750 V); IEC 60227 (international equivalent); GB/T 3956 (Class 5 flexible conductors). Rated 450/750 V.
9. Packaging, Storage & Logistics. 100 m per coil, plastic wrapped. Continuous marking: BVR, 4.0mm², 450/750V, GB/T 5023, metre marks. Store dry, indoor.
10. Procurement Specification. State "BVR-4.0, color" + length. Red = phase, blue = neutral, yellow-green = earth. Confirm against factory test certificate.
11. Cable Industry FAQ.
- Q1: What is the difference between BVR and BV? BVR (R = soft) uses a Class 5 fine-stranded conductor (~56×0.30 mm) for maximum flexibility. BV uses a Class 2 stranded conductor (19×0.50 mm) for fixed rigid installation. BVR bends easier and resists fatigue, but has slightly higher DC resistance (4.95 vs 4.61 Ω/km).
- Q2: When should I choose BVR over BV? Choose BVR where flexibility matters — control panels, equipment leads, tight conduit, repeated bending. Choose BV for straight runs in conduit where rigidity is not a problem.
- Q3: Why is the DC resistance higher for BVR? The fine strands have small gaps between them, reducing effective copper area. This gives BVR a slightly higher resistance (4.95 vs 4.61 Ω/km for BV). The difference is small and acceptable.
- Q4: What does "Class 5" mean? Per GB/T 3956 / IEC 60228, Class 5 is the flexible conductor class — many thin strands. Class 2 is rigid stranded; Class 1 is solid.
- Q5: Can BVR be used outdoors? No — standard PVC insulation is not UV-resistant. Use outdoor-rated cable or conduit for exterior runs.
- Q6: What is the ampacity of BVR-4.0? Approximately 32 A in free air at 30 °C. In conduit with multiple wires, derate to ~25 A depending on grouping.
- Q7: What is the bending radius? 2×OD ≈ 8 mm — very flexible. Easy to route around corners in tight panels.
- Q8: What color coding is used? Red = phase L1, blue = neutral N, yellow-green = protective earth PE, black = alternate phase.
- Q9: Can I use BVR for fixed wall wiring? Yes — BVR can be used for any fixed indoor wiring where BV is used. The only difference is flexibility. BVR is slightly more expensive.
- Q10: Is BVR fire-resistant? No — BVR is general-purpose PVC wire. For fire circuits, use mineral-insulated fire cables (BTTRZ/BTLY).
- Q11: How do I terminate BVR-4.0? Use crimp lugs rated for flexible conductors (ferrule terminals). The fine strands must be fully captured in the lug to avoid stray strands and high resistance.
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