4.0mm2 Solid Copper Conductor 450V 750V Single Stranded Copper Wire
Product Summary
Product Details
750v single stranded copper wire
,4.0mm2 copper wire solid
,4.0mm2 single stranded copper wire
Product Description
BV 4.0mm² Solid Copper PVC Insulated Building Wire 450/750V Easy Pull Electrical Cable
Cable Designation & Meaning
|
Code |
Meaning |
|---|---|
|
B |
Fixed wiring cable (Class B — building wire) |
|
V |
PVC (polyvinyl chloride) insulation |
|
4.0 mm² |
Nominal cross-sectional area of conductor |
Construction: Plain copper conductor (solid or stranded), PVC insulation, single-core non-sheathed building wire.
Applicable Standards
- GB/T 5023-2008 / IEC 60227 — Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V
- GB/T 3956 / IEC 60228 — Conductors (Class 1 solid or Class 2 stranded, copper)
- GB/T 18380 / IEC 60332 — Flame retardant tests
- GB/T 2951 / IEC 60811 — Insulating and sheathing materials — Common test methods
BV-4.0 mm² — Single-Core PVC Insulated Copper Building Wire — Specification & Engineering Data (English)
1. Overview & Ratings. BV-4.0 is a single-core PVC insulated copper building wire rated 450/750 V, 70 °C continuous conductor temperature. Built per GB/T 5023 / IEC 60227. It is the standard wire for fixed indoor electrical wiring in residential, commercial, and industrial buildings — pulled into conduit or trunking. Finished Ø ≈ 3.8 mm, ≈ 48 kg/km, supplied on 100 m coils.
2. Construction Stack (Conductor → Outer).
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Conductor | Stranded annealed Cu, Class 2, 4.0 mm² | — | ≈ 2.25 mm |
| PVC insulation | Polyvinyl chloride, general-purpose | ≈ 0.8 mm | ≈ 3.8 mm (finished) |
3. Electrical Characteristics. DC resistance ≤ 4.61 Ω/km at 20 °C (Cu 4.0 mm²); test voltage 2.5 kV AC / 5 min; insulation resistance ≥ 20 MΩ·km. Nominal ampacity ≈ 35 A (in conduit, 30 °C). Voltage drop ≈ 1.7 V/A·100 m.
Insulation Data
|
Property |
Value |
|---|---|
|
Material |
PVC (polyvinyl chloride) |
|
Nominal thickness |
0.8 mm |
|
Long-term service temp. |
70 °C (continuous) |
|
Short-circuit temp. (≤5 s) |
160 °C (Cu conductor limit per IEC 60228) |
|
Emergency overload temp. |
90 °C (short term) |
|
Weather resistance |
Limited — for indoor/dry use only; not UV-resistant |
|
Flame retardant |
GB/T 18380.3 Category C (ZC) available; standard version passes IEC 60332-1 |
|
Smoke density |
Standard (non-low-smoke) |
|
Halogen content |
Contains halogen (PVC) |
|
Corrosivity |
Corrosive (PVC) |
Electrical Parameters
|
Parameter |
Value |
Note |
|---|---|---|
|
Rated voltage U₀/U |
450 / 750 V |
GB/T 5023 / IEC 60227 |
|
Test voltage AC (50 Hz, 5 min) |
2500 V |
Routine test |
|
DC resistance @20 °C |
≤ 7.41 Ω/km |
GB/T 3956 Class 1 max, 2.5 mm² (solid Cu) |
|
AC resistance @70 °C (est.) |
≈ 9.40 Ω/km |
per core |
|
Capacitance (approx.) |
negligible |
single-core building wire |
|
Inductive reactance (approx.) |
negligible |
— |
|
Current rating in conduit (30 °C ambient) |
24 A |
single-phase, 2-core circuit (GB/T 16895) |
|
Current rating in free air (30 °C) |
27 A |
single cable |
|
Current rating buried (20 °C) |
22 A |
direct in soil (not recommended) |
|
Short-circuit current (1 s, Cu, 160 °C) |
≈ 0.25 kA (250 A) |
2.5 mm² Cu |
|
Frequency |
50/60 Hz AC |
— |
Reference values: 2.5 mm² Cu at 24 A, single-phase 230 V → max load ≈ 5.5 kW. Voltage drop at 24 A ≈ 17.8 V/km per core (≈0.78% per 10 m at 230 V).
Temperature Characteristics
|
Property |
Value |
|---|---|
|
Max. conductor operating temp. |
70 °C (continuous) |
|
Max. short-circuit temp. (≤5 s) |
160 °C (Cu conductor) |
|
Emergency overload temp. |
90 °C (short term) |
|
Min. installation ambient temp. |
0 °C (PVC insulation); below 0 °C pre-heating required |
|
Service ambient range |
−15 °C to +70 °C (indoor/dry) |
|
Fire survival |
Standard (non-fire-rated); optional fire-resistant version available (BTTZ, BTTRZ) |
4. Thermal & Mechanical. 70 °C continuous conductor temperature; 160 °C short-circuit (≤ 5 s); ambient range −15~+70 °C. Bend ≥ 3 × OD ≈ 12 mm fixed. Self-extinguishing PVC insulation.
Fire Performance (BV — Standard)
|
Property |
Value / Requirement |
|---|---|
|
Flame retardant |
GB/T 18380.3 Category C (ZC), Category B (ZB) available |
|
Halogen content |
Contains halogen (PVC insulation) |
|
Smoke density |
Standard (non-low-smoke) |
|
Corrosivity |
Corrosive (PVC) |
|
Fire survival (circuit integrity) |
Not applicable (standard version); use mineral-insulated or fire-resistant building wire |
5. Installation Practice & Handling. Pull into conduit or trunking. Use wire stripper to avoid nicking the conductor. Crimp lugs or use screw terminals. At 48 kg/km, lightweight and easy to route. Indoor use only — not for outdoor UV exposure.
Mechanical & Installation Parameters
|
Parameter |
Value |
Remarks |
|---|---|---|
|
Minimum bending radius |
≥ 4 × OD → ≈ 14 mm at Ø3.5 mm |
static installation |
|
Max. pulling tension |
100 N |
solid Cu conductor, avoid sharp bends |
|
Conduit ID |
≥ 1.5 × OD → ≥ 5.3 mm; use 16 mm or 20 mm conduit |
standard building conduit |
|
Fixing |
cable clips, conduit, trunking |
— |
|
Impact resistance |
Low |
not armoured; protect with conduit |
|
Water resistance |
Poor |
indoor/dry locations only |
|
UV resistance |
Poor |
not for outdoor exposed use |
|
Termination note |
Strip insulation 10–12 mm; use standard copper lugs or screw terminals |
solid conductor requires careful handling to avoid breakage |
6. Typical Service Applications. Indoor fixed wiring: lighting outlets, socket circuits, appliance connections, control panel wiring — residential, commercial, and industrial buildings.
7. Testing & QA Regime. Routine: conductor DC resistance, 2.5 kV AC / 5 min withstand, insulation resistance, insulation thickness. Type: heating test, bending test, flame retardancy, cold bend at −15 °C.
The Wire Parameters
| BV-4.0 mm² (red) — Copper PVC-Insulated Building Wire — Full Parameter Sheet | ||||
| Copper PVC-insulated building wire · solid Class 1 conductor / red PVC insulation · 450/750 V AC · switch control & emergency circuits · GB/T 5023 / JB/T 8734 · finished Ø ≈ 3.6 mm | ||||
| Section | Parameter | Value | Unit | Remarks / Standard |
| 01 · Identification | ||||
| Cable type | BV (Copper PVC-insulated building wire) | — | Switch control / emergency circuit, single core | |
| Rated voltage (U0/U) | 450/750 | V AC | For building interior fixed wiring | |
| Number of cores | 1 × 2.5 | — | Single core | |
| Conductor material | Annealed solid copper | — | Class 1 solid per GB/T 3956 | |
| Insulation material | Polyvinyl chloride (PVC) | — | PVC-70 °C grade, red pigment | |
| Outer sheath | None | — | Single-layer insulation, no outer sheath | |
| Colour | Red | — | Standard switch control / emergency circuit colour | |
| Standard | GB/T 5023 / JB/T 8734 | — | Chinese building wire standard | |
| 02 · Conductor (Solid Copper) | ||||
| Conductor type | Solid round copper wire | — | Class 1 solid per GB/T 3956 | |
| Conductor diameter | 1.78 | mm | Solid single wire | |
| Cross-sectional area | 2.5 | mm² | Nominal | |
| DC resistance @ 20 °C | ≤ 7.41 | Ω/km | Maximum per GB/T 3956 | |
| Conductor screen | None | — | LV building wire | |
| Conductor weight per km | ≈ 22 | kg/km | Copper density 8.89 g/cm³ | |
| 03 · Insulation (PVC) | ||||
| Insulation type | Polyvinyl chloride (PVC) | — | PVC-70 °C grade, red pigment | |
| Insulation thickness | 0.8 | mm | Nominal | |
| Finished outer diameter | ≈ 3.6 | mm | 1.78 + 2×0.8 | |
| Colour | Red | — | Standard switch control / emergency circuit colour | |
| Outer sheath | None | — | No outer sheath — insulation is the outer layer | |
| 04 · Electrical | ||||
| Rated voltage (AC) | 450/750 | V | For building interior fixed wiring | |
| DC resistance @ 20 °C | ≤ 7.41 | Ω/km | 2.5 mm² Cu Class 1 | |
| Insulation resistance | ≥ 0.011 | MΩ·km | PVC at 20 °C | |
| Conductor loss (at 24 A) | ≈ 4.3 | W/m | I²R at 70 °C | |
| Routine test voltage (AC) | 2.0 kV / 5 min | — | Power-frequency withstand | |
| Voltage test (AC) | 2.5 kV / 5 min | — | AC withstand test | |
| 05 · Thermal | ||||
| Max continuous conductor temp. | 70 | °C | PVC rated | |
| Short-circuit temp. | 160 | °C | PVC limit (≤ 5 s) | |
| Min installation temp. | 0 | °C | PVC becomes brittle below 0 °C | |
| Service ambient range | 0 to +70 | °C | Indoor dry locations | |
| UV resistance | None | — | Indoor use only — not UV resistant | |
| Ozone resistance | Limited | — | Indoor use only | |
| Halogen-free | No | — | PVC contains halogen | |
| Flame retardancy | IEC 60332-1 / GB/T 18380 | — | Self-extinguishing | |
| 06 · Mechanical | ||||
| Min bending radius (fixed) | ≥ 4 × OD ≈ 14 | mm | Fixed installation | |
| Tensile strength (insulation) | ≥ 10.0 | MPa | PVC insulation | |
| Abrasion resistance | Good | — | Indoor conduit / trunking | |
| Oil / fuel resistance | No | — | Indoor dry locations only | |
| 07 · Ampacity | ||||
| Air ampacity (open, 30 °C) | ≈ 24 | A | Single core, free air (est.) | |
| Conduit ampacity (3-core) | ≈ 19 | A | In conduit, grouped | |
| Voltage drop (per 100 m @ 24 A) | ≈ 1.8 | V | Single-phase loop ≈ 3.6 V | |
| 08 · Installation | ||||
| Laying methods | Conduit, trunking, wall conduit, switch wiring, emergency circuits | — | Indoor fixed installation | |
| Connectors | Screw terminals, crimp lugs, wire nuts | — | Standard building wiring | |
| Polarity | Colour-coded | — | Red = switch control / emergency circuit | |
| Special tools | Wire cutter, stripper, screwdriver | — | Standard electrical tools | |
| 09 · Packing | ||||
| Standard supply length | 100 m / coil | m | Building wire | |
| Reel / packing type | Coil / carton | — | Standard packaging | |
| Surface marking | BV, 2.5 mm², 450/750 V, GB/T 5023, metre marks | — | Continuous printing | |
| Storage conditions | Dry, indoor, 0 to +40 °C | — | Protect from UV / moisture | |
| 10 · Applications | ||||
| Typical use | Switch control circuits, emergency lighting circuits, fire alarm circuits, residential phase L1, lighting switch wiring, smoke detector circuits | — | Indoor fixed wiring | |
| Max system voltage | 750 | V AC | 450/750 V rated | |
| Circuit current rating | Up to 24 | A | Per circuit breaker | |
The Wire Test Parameters
| Test Parameters — BV-4.0 mm² (red) | ||||
| No. | Test Item | Test Condition / Method | Requirement | Type |
| 1 | Conductor DC resistance | GB/T 3956, 20 °C | ≤ 7.41 Ω/km (2.5 mm² Cu) | Routine |
| 2 | Power-frequency withstand | 2.0 kV AC, 5 min | No breakdown | Routine |
| 3 | Thickness test | Micrometer | Insulation ≥ 0.8 mm | Routine |
| 4 | Dimensional check | Micrometer | OD ≈ 3.6 mm | Routine |
| 5 | Flame retardancy | GB/T 18380 / IEC 60332-1 | Self-extinguishing | Type |
| 6 | Heat ageing | 168 h at 100 °C | No cracking after bend test | Type |
| 7 | Cold bend test | 0 °C, mandrel 4×OD | No cracks | Type |
| 8 | Heat shock | 1 h at 150 °C | No cracking | Type |
| 9 | Insulation resistance | At 500 V DC, 20 °C | ≥ 0.011 MΩ·km | Type |
| 10 | Conductor continuity | Per GB/T 3956 | Solid continuous | Routine |
| 11 | Colour check | Visual | Red insulation | Routine |
| 12 | Marking check | Visual | BV, 2.5, 450/750 V printed | Routine |
The Wire Cross Section Structure
| BV-4.0 mm² (red) — Cross-Section Construction Diagram (Schematic) | |||||
| Building wire build-up: solid copper conductor → red PVC insulation · 450/750 V AC · finished Ø ≈ 3.6 mm · no outer sheath · switch control / emergency circuit | |||||
| No. | Layer | Material / Construction | Nominal Thickness (mm) | Diameter (mm) | Function / Remarks |
| 1 | Conductor | Solid round annealed copper wire, Class 1 | — | 1.78 | Switch control / emergency circuit; R ≤ 7.41 Ω/km at 20 °C |
| 2 | Insulation | Polyvinyl chloride (PVC), red | 0.8 | ≈ 3.6 (finished) | Electrical insulation; 70 °C rated |
| 3 | (No sheath) | — | — | — | No outer sheath — insulation is the outer layer |
| Key Dimensions & Properties (expanded) | |||||
| Finished cable diameter | ≈ 3.6 | mm | 1.78 + 2×0.8 | ||
| Approx. cable mass | ≈ 22 | kg/km | Cu + PVC insulation | ||
| Nominal voltage rating | 450/750 | V AC | Building interior fixed wiring | ||
| Max continuous conductor temp. | 70 | °C | PVC rated | ||
| Short-circuit temp. (≤5 s) | 160 | °C | PVC limit | ||
| Min installation temp. | 0 | °C | PVC becomes brittle below 0 °C | ||
| Min bending radius | ≥ 4 × OD ≈ 14 | mm | Fixed installation | ||
| DC resistance @ 20 °C | ≤ 7.41 | Ω/km | 2.5 mm² Cu Class 1 | ||
| Insulation resistance | ≥ 0.011 | MΩ·km | PVC | ||
| Routine test voltage (AC) | 2.0 kV / 5 min | — | Power-frequency withstand | ||
| Air ampacity @ 30 °C | ≈ 24 | A | Single core, free air (est.) | ||
| Flame retardancy | GB/T 18380 / IEC 60332-1 | — | Self-extinguishing | ||
| Halogen-free | No | — | PVC contains halogen | ||
| UV resistance | None | — | Indoor use only | ||
| Schematic — not to exact scale. Finished Ø ≈ 3.6 mm and weight ≈ 22 kg/km from cross-referenced industry samples; conductor/insulation dimensions per GB/T 5023 and GB/T 3956; ampacity 24 A is an engineering estimate for single core in free air. BV is the standard Chinese building wire — solid copper conductor with PVC insulation, rated 450/750 V AC for interior fixed wiring. The red colour is commonly used for switch control circuits, emergency lighting circuits, fire alarm circuits, and residential phase L1 wiring. Unlike the black variant (industrial switchboard phase L1), red is chosen where switch control or emergency circuit colour coding matters. Values marked (est.) require confirmation against the factory test certificate. | |||||
Construction Description
| Construction Description — BV-4.0 mm² (red) | |||
| Layer-by-layer building wire build-up · solid copper conductor / red PVC insulation · 450/750 V AC · finished Ø ≈ 3.6 mm · no outer sheath · switch control / emergency circuit | |||
| 1. Product Identity & Ratings | |||
| BV-2.5 (red) is the standard Chinese copper PVC-insulated building wire rated 450/750 V AC for interior fixed wiring, built and tested per GB/T 5023 / JB/T 8734. Unlike the black variant (industrial switchboard phase L1), this red version is the standard **switch control / emergency circuit conductor**, designed for switch control circuits, emergency lighting circuits, fire alarm circuits, and residential phase L1 wiring. The red colour provides instant visual identification of control and emergency circuits. Finished diameter is about 3.6 mm, mass about 22 kg/km, supplied in 100 m coils. | |||
| 2. Solid Copper Conductor | |||
| The 2.5 mm² conductor is a solid round annealed copper wire (Class 1) — a single 1.78 mm diameter wire, not stranded. This gives a maximum DC resistance of 7.41 Ω/km at 20 °C. The solid conductor is rigid and designed for fixed installation only — it should not be flexed repeatedly. The copper is annealed for conductivity, not tinned (unlike PV cables, which use tinned strands for outdoor corrosion resistance). | |||
| 3. Red PVC Insulation | |||
| The solid conductor is fully enclosed in a 0.8 mm layer of red polyvinyl chloride (PVC). This single layer provides both electrical insulation and the outer jacket — there is no separate outer sheath (unlike PV cables' double-layer construction). The PVC is rated for 70 °C continuous conductor temperature (short-circuit up to 160 °C for ≤ 5 s). The red colour is the standard switch control / emergency circuit conductor colour, providing instant visual identification during installation and maintenance. | |||
| 4. No Outer Sheath | |||
| Unlike power cables and PV cables, BV has no outer sheath — the PVC insulation IS the outer layer. This keeps the cable thin, light, and low-cost for building wiring. The insulation provides basic mechanical protection and electrical isolation, but the cable must be installed inside conduit, trunking, or wall conduit for additional mechanical protection. It is not suitable for direct burial or outdoor UV exposure. | |||
| 5. Site Handling & Operational Notes | |||
| • Install inside conduit, trunking, or wall conduit — do not leave exposed outdoors. • Observe the 4 × OD minimum bend radius (≈ 14 mm). • Service range 0 to +70 °C; conductor up to 70 °C continuous. • Routine test 2.0 kV AC / 5 min. • PVC contains halogen — not suitable for low-smoke halogen-free requirements (use WDZ-BYJ for LSZH). • At about 2.2 kg per 100 m, the cable is supplied in 100 m coils. • Red colour = switch control / emergency circuit; match neutral (blue/white) and protective earth (green/yellow) per local wiring codes. • Use standard screw terminals, crimp lugs, or wire nuts — no MC4 connectors needed. |
8. Company Display
9. Packaging, Storage & Logistics. 100 m per coil, plastic wrapped. Continuous marking: BV, 4.0mm², 450/750V, GB/T 5023, metre marks. Store dry, indoor.
10. Procurement Specification. State "BV-4.0, color" + length. Red = phase, blue = neutral, yellow-green = earth. Confirm against factory test certificate.
11. Cable Industry FAQ.
- Q1: What does "BV" mean? B = fixed building wire; V = PVC insulation. It is a single-core copper wire with PVC insulation for fixed indoor wiring.
- Q2: What is the difference between BV and BVR? BV has a stranded (or solid) rigid conductor for fixed permanent installation. BVR has a flexible multi-strand conductor where some movement is needed.
- Q3: Why is the PVC insulation only 0.8 mm thick? At 450/750 V, the voltage is low, so thin PVC is sufficient for electrical insulation. The thin wall keeps the wire small and easy to pull through conduit.
- Q4: Can BV wire be used outdoors? No — standard PVC insulation is not UV-resistant. Outdoor exposure will embrittle the PVC within 1–2 years. Use outdoor-rated cable or conduit for exterior runs.
- Q5: What is the ampacity of BV-4.0? Approximately 35 A in free air at 30 °C. In conduit with multiple wires, derate to ~25–30 A depending on grouping and ambient temperature.
- Q6: Why are different colors available? Red = phase L1, blue = neutral N, yellow-green = protective earth PE, black = alternate phase. Color coding prevents wiring errors.
- Q7: What is the bending radius? 3×OD ≈ 12 mm. Very flexible — easy to route around corners in conduit.
- Q8: Can BV-4.0 be used for 3-phase circuits? Yes — use 3× BV-4.0 (red, yellow, black) for phases + 1× blue for neutral + 1× yellow-green for earth.
- Q9: What is the maximum circuit length? Depends on voltage budget. At 4.61 Ω/km, voltage drop limits long runs. For a 35 A circuit, keep under ~30–40 m to stay within 3% voltage drop.
- Q10: Is BV wire fire-resistant? No — BV is general-purpose PVC wire. For fire circuits, use mineral-insulated fire cables (BTTRZ/BTLY).
- Q11: How do I terminate BV-4.0? Strip ~10 mm of insulation, insert into screw terminal or crimp a lug. Ensure no copper strands are stray outside the connection.
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