BVR 2.5mm² Flexible Copper Wire PVC Insulated Easy Routing for Indoor Building Electrical Wiring

Cable Designation & Meaning

Construction: One 2.5 mm² stranded copper conductor (Class 2 or Class 5), PVC insulation applied directly over the conductor.

BVR 1×2.5 mm² — Single-Core Stranded PVC Insulated Flexible Building Wire 

1. Overview & Ratings

BVR 1×2.5 is a single-core PVC insulated flexible building wire rated 450/750 V. It uses pure annealed bare copper (not tinned) in a Class 5 stranded lay-up, chosen for high conductivity and easy bending in panels and tight runs. One 2.5 mm² copper bundle is covered by a continuous PVC insulation; there is no braid shield, no inner sheath and no outer jacket. Finished OD ≈ 3.6 mm, ≈ 30 kg/km (est.), ≈ 20–25 A in conduit. Max conductor temperature 70 °C, -15 to +70 °C. Intended for fixed indoor and panel wiring; not for trailing drag chains, outdoor UV exposure or direct burial.

2. Construction Stack (Inner → Outer, expanded)

3. Electrical Characteristics

DC resistance ≤ 7.41 Ω/km at 20 °C per GB/T 3956 Class 5 pure copper. Rated voltage 450/750 V. Estimated ampacity ≈ 20–25 A in conduit at 30 °C, up to ≈ 32 A in free air, with derating for grouping and enclosure. Insulation resistance ≥ 20 MΩ·km. Routine AC withstand test at 2000 V for 5 minutes. Typical capacitance ≈ 150 pF/m at 1 kHz. As a single-core wire it carries one phase, neutral or earth conductor per run; circuit identification is handled by insulation colour rather than internal pairing.

Insulation & Sheath Data

Electrical Parameters

Reference values: BVR 2.5 at 21–25 A, 230 V AC → max load ≈ 4,830–5,750 VA​ (typical lighting/socket/control circuit). At 24 V DC → max load ≈ 576 W.

4. Thermal & Flame Behaviour

Operating range -15 to +70 °C continuous. Short-circuit withstand up to 160 °C for ≤ 5 seconds. The PVC insulation is flame-retardant per IEC 60332-1 and self-extinguishing after the ignition source is removed. The cable is halogen-containing (PVC), emitting HCl gas on burning — avoid in enclosed public or high-density spaces where LSZH wiring is required. The insulation surface is smooth and oil-limited; protect it from direct sunlight, solvents and prolonged moisture. Bare copper should be terminated in dry, enclosed locations.

Temperature Characteristics

Fire Performance (BVR — PVC, Non-Low-Smoke)

5. Installation Practice & Handling

Minimum bending radius ≥ 4×OD ≈ 14 mm. The Class 5 stranded core is suppler than a solid wire, so it dresses around panel corners, terminal rows and tight duct bends without kinking. Terminate by stripping the insulation, terminating the bundle in a ferrule, lug or terminal block, and tightening to the rated torque. Group live, neutral and earth conductors in the same conduit; keep green-yellow earth wires separate in identification. After installation, verify insulation resistance and continuity before energizing. Do not use as a trailing appliance cord or drag-chain cable.

Mechanical & Installation Parameters

6. Typical Service Applications

Panel internal wiring and switchboard connections, vibrating equipment and motor terminal leads where flexibility matters, tight-bend runs in control cabinets, distribution board internal conductors, and fixed indoor lighting and socket branch circuits. The stranded construction is preferred where the wire must bend around obstructions or connect to equipment subject to vibration, while still serving as a fixed wiring conductor. Typical installation: conduit, trunking, cable tray and panel raceway. It is not designed for: shielded signal transmission, trailing or moving equipment, outdoor UV-exposed runs, submersible or buried circuits, or high-temperature heater wiring.

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7. Testing & Quality Assurance Regime

Routine tests (100% production): DC resistance, AC voltage withstand (2000 V/5 min), insulation resistance, conductor construction, insulation thickness, dimensional check, print legibility, mass per length, visual appearance, and packing. Type tests (per batch / material change): heat aging (100 °C/7 days), cold bend (-15 °C), insulation tensile and elongation, flame retardancy, conductor flexibility under repeated bending, and wall thickness uniformity. Every coil ships with mill test certificate, ROHS and REACH declarations. The 450/750 V rating uses a 2000 V withstand test.

The Wire Parameters

The Wire Test Parameters

Cross Section Structure

Construction Description

8. Factory Advantages

Pure annealed stranded copper delivers stable conductivity with a flexible, supple core that resists kinking in tight panels. Class 5 stranding keeps the wire dressable around corners and terminal rows. Continuous PVC extrusion gives a smooth, uniform wall with consistent colour and diameter. Standard circuit colours are available to prevent wiring errors at site. Ferrules seat cleanly on the stranded bundle, reducing loose-connection risk. 100% routine electrical QA on every coil. Cut-to-length packaging with sealed ends reduces waste. Lightweight ≈ 30 kg/km for easy coil handling. Full traceability with MTC and certification support for panel-build and building-wiring tenders.

9. Packaging, Storage & Logistics

Cut to customer-specified length on export-grade coils, with both ends sealed to prevent moisture ingress. Coils wrapped in waterproof film and cardboard, labelled with designation BVR, cross-section, colour, length, weight, production date and reel number. Standard lengths 100/200/500/1000 m; custom lengths available. Store dry indoor, -10 to +40 °C, below 75% RH, away from direct sunlight, solvents and chemical fumes. FOB Shanghai/Nanjing/Qingdao; CIF and DAP available. Sample lead time 5–7 days; bulk production 15–25 days. Mixed-colour lots are packed and labelled separately.

10. Procurement Specification

State wire designation "BVR 1×2.5 pure copper", required colour (red/blue/yellow/green-yellow/black/white), and length per coil. Request the routine AC withstand test record (2000 V) and DC resistance certificate for the specific batch. Note this is a pure copper (bare) flexible fixed-wiring variant for dry indoor use — for damp or outdoor locations, specify a tinned or appropriate insulated variant. Specify any regional certification requirements (CE, etc.) at order time. Payment: 30% T/T deposit, balance against B/L copy. Documents: MTC, ROHS/REACH, COO, commercial invoice, packing list.

11. Cable Industry FAQ

Q1: What does "BVR" mean? B denotes a copper conductor, V denotes PVC insulation, and R denotes a stranded flexible construction; BVR is the stranded flexible version of the BV building wire in IEC 60227 practice.

Q2: Why choose BVR over BV? The stranded Class 5 core is suppler and bends tighter than a solid wire, making BVR the preferred choice in panels, cabinets and vibrating equipment where BV solid would kink or fatigue.

Q3: Is the conductor solid or stranded? Stranded: 49 wires of 0.25 mm pure annealed copper in a Class 5 lay-up, DC resistance ≤ 7.41 Ω/km at 20 °C.

Q4: What is the voltage rating? 450/750 V, suitable for low-voltage fixed indoor and panel wiring.

Q5: What current can 2.5 mm² carry? ≈ 20–25 A in conduit, up to ≈ 32 A in free air, derated for grouping and enclosure; confirm against local wiring rules and circuit protection.

Q6: Why pure copper instead of tinned? Bare pure copper gives the highest conductivity for fixed indoor contacts; tinned copper is normally chosen where moisture or outdoor corrosion is a concern.

Q7: What do the colours mean? Red = live/phase, blue = neutral, green-yellow = protective earth; yellow, black and white are supplementary colours.

Q8: Does BVR have a shield? No — BVR is an unshielded single-core wire. For EMI-sensitive signal circuits, use a shielded RVVP-type multiconductor cable.

Q9: Can it be used outdoors? Not directly — limited UV resistance and bare copper oxidize in humidity. Install inside UV-protected conduit or choose an outdoor-rated cable.

Q10: What proof ships? Routine AC test record (2000 V) + DC resistance certificate + MTC.

Q11: What is the temperature range? -15 to +70 °C continuous. For high-temperature or flexible trailing-duty duty, a dedicated flexible or high-temperature cable should be specified instead.