4.0mm² 3 Core RVV PVC Flexible Cable Stranded Copper 300/500V for Central Air Conditioner

Cable Designation & Meaning

RVV 3×4.0 mm² — Cable Specification & Engineering Data

1. Product Overview & Rating Summary. RVV 3×4.0 is a three-core flexible PVC-insulated PVC-sheathed cord rated at 300/500 V AC (50 Hz) and 70 °C conductor temperature, built around three 4.0 mm² annealed copper Class 5 flexible conductors — each PVC-insulated and collectively jacketed in a second PVC oversheath. Manufactured and type-tested to GB/T 5023.5 (60227 IEC 53) / IEC 60227-5, with flexible conductors per GB/T 3956. Finished diameter is about 12.7 mm and nominal mass about 300 kg/km (≈ 30 kg per 100 m), supplied on 100 m reels or cartons. With all three cores energised, the cord carries about 32 A in free air at 25 °C (engineering estimate) — a heavy-duty flexible cord at the upper end of the 300/500 V PVC family, suited to substantial appliance and industrial interconnection.

2. Layer-by-Layer Construction (Conductor to Jacket).

3. Electrical Characteristics. Each 4.0 mm² conductor is held to a maximum DC resistance of 4.95 Ω/km at 20 °C, rising to around 6.30 Ω/km at the 70 °C operating point. Every length survives the routine 2.0 kV AC power-frequency proof held for five minutes. Finished-cable insulation resistance remains above 0.0085 MΩ·km at 70 °C, and typical figures include capacitance ≈ 150 nF/km and 50 Hz AC impedance ≈ 4.95 Ω/km (resistance-dominant). With all three cores energised, reference loading is about 32 A in free air at 25 °C (engineering estimate), and the loop voltage drop at 32 A is about 0.32 V per metre.

Electrical Parameters

4. Thermal Response & Flame Behaviour. PVC insulation sustains a 70 °C continuous conductor temperature. The cord is rated for service ambients between −15 and +70 °C, must not be uncoiled below 0 °C without pre-conditioning, and uses 25 °C as the reference ambient for ampacity. Flame behaviour meets the single-cable vertical test GB/T 18380.12 (IEC 60332-1), meaning the cord self-extinguishes when the flame source is removed. Because both insulation and sheath are halogenated PVC, the cord emits smoke and hydrogen chloride in a fire; low-smoke zero-halogen projects must specify an LSZH variant.

5. Installation Practice & Handling. Bends must not fall below 6 times the actual outer diameter — about 76 mm for this size. Termination requires stripping 18–22 mm and always using a ferrule on the flexible Class 5 strands to prevent wire fraying. Reels held below 0 °C in storage must be warmed indoors before uncoiling; pulling tension should stay within 240 N, and the cord must never be used as a pulling rope. The 32 A reference requires derating whenever ambient temperature or bundling deviates from reference conditions. This cord is not for direct burial, outdoor UV exposure or continuous repetitive flexing — for those duties choose an armoured cable, a UV-stabilised jacket or a continuous-flex (trunking) cable respectively.

Cable Cross Section Structure

Cable Construction Description 

6. Typical Service Applications. This cord serves heavy three-wire power duties: industrial machine-tool and welding-current leads up to about 32 A, small compressor and refrigeration-unit interconnect, three-phase supply for small equipment at 230 V, commercial kitchen and laundry appliance leads, workshop and garage fixed supply drops, water pump and irrigation-system leads, temporary site power extension leads, control panel and distribution board interconnection, and agricultural machinery supply cords. Approved installation methods include fixed wiring inside appliances, cable trunking and indoor ducting in dry locations, both indoors and in covered sheltered spaces.

7. Testing & Quality Assurance Regime. Routine tests on every length include conductor DC resistance verification (≤ 4.95 Ω/km at 20 °C), the 2.0 kV AC / 5 min withstand, conductor continuity across all three cores, and dimensional inspection covering insulation ≥ 0.80 mm, sheath ≥ 1.10 mm and overall diameter ≈ 12.7 mm. Sample and type tests comprise PVC insulation and sheath tensile strength (≥ 10 MPa) with elongation (≥ 100 % insulation / ≥ 125 % sheath), PVC heat deformation at 80 °C, PVC shrinkage at 150 °C, the single-cable vertical flame test, bending and cold-bend tests at −15 °C, and the voltage test after flexing. A factory test certificate accompanies each reel.

Cable Parameters

Cable Test Parameters

8. Standards & Conformity. Design and production are governed by GB/T 5023.5 and IEC 60227-5 for 300/500 V flexible cords (60227 IEC 53). Conductors satisfy GB/T 3956 / IEC 60228 Class 5 — the 4.0 mm² conductor as fifty-six wires of 0.30 mm with R ≤ 4.95 Ω/km. Flame behaviour is proven by GB/T 18380.12. General test methods follow GB 5023.1 / GB 5023.3, while surface marking complies with GB/T 6995. Cables can also be supplied to IEC, BS, DIN, UL or VDE requirements on request. Because the PVC jacket contains halogen, tunnels, metro systems, hospitals and other confined public areas call for an LSZH variant.

9. Packaging, Storage & Logistics. Standard delivery is 100 m per reel or carton, with bespoke cut lengths available on request. Each reel carries type, voltage, supplier identity, production year and sequential metre marking per GB/T 6995. Storage should be in dry, covered premises at −15 to +40 °C, shielded from direct sunlight, moisture, oils and sharp objects; reels remain sealed until installation. In cold conditions, condition reels indoors to ≥ 0 °C before uncoiling. During transit, reels must be secured against rolling and impact, and the cord must never be dragged across abrasive ground or sharp edges.

10. Procurement Specification. State "RVV 300/500 V 3×4.0" together with the required length or reel arrangement, insulation colour combination and marking preferences. Specify the sheath colour (black is standard) and any special colour-coding (e.g. brown/blue/yellow-green for 230 V supply with earth). Always request the factory test certificate to confirm the actual diameter (≈ 12.7 mm), weight (≈ 300 kg/km) and conductor resistance for the production batch. Where low-smoke zero-halogen or continuous-flex construction is needed, order the LSZH or H05VV5-F variant respectively.

11. Cable Industry FAQ.

• Q1: How does 3×4.0 differ from 3×2.5? Conductor area grows from 2.5 to 4.0 mm² per core: stranding changes from 50×0.25 to 56×0.30, resistance falls from 7.41 to 4.95 Ω/km, finished diameter rises from 11.0 to 12.7 mm, weight from 215 to 300 kg/km and ampacity from 25 to 32 A. Voltage rating, temperature rating and sheath/insulation material stay the same.
• Q2: Why a three-core cord with 4.0 mm²? The third core is the protective earth conductor (PE), while the 4.0 mm² cross-section supports up to about 32 A — enough for machine-tool leads, compressors and heavy appliance supplies rather than just internal wiring.
• Q3: What does Class 5 flexible conductor mean? Class 5 (GB/T 3956) is made of many thin wires (56 × 0.30 mm at 4.0 mm²), giving the cord its flexibility and bend endurance. Class 2 (used in power cables like YJV) uses fewer thicker wires and is much stiffer — never mix them up when ordering.
• Q4: Can RVV be used outdoors? Not in its standard form: the PVC jacket is not UV-stabilised and will degrade under prolonged sunlight. For outdoor use specify a UV-stabilised jacket or an armoured cable. For burial, use a steel-tape armoured power cable.
• Q5: How is the conductor cross-section chosen for an appliance lead? Selection follows (a) full-load current after derating, (b) permissible voltage drop (typically ≤ 5 % for appliance leads), and (c) coordination with the upstream fuse or circuit breaker. A 4.0 mm² cord supports up to about 32 A; higher loads require 6.0 or 10 mm².
• Q6: Copper or tinned copper conductor? Bare annealed copper (this RVV) is standard for fixed appliance leads and gives the lowest resistance. Tinned copper is preferred where the conductor may be exposed to moisture or where solder termination is used, because it resists oxidation.
• Q7: Why can PVC only run at 70 °C while XLPE runs at 90 °C? PVC is a thermoplastic that softens and deforms at elevated temperature; XLPE is cross-linked into a thermoset network that retains its shape up to 90 °C. This is why RVV (PVC) is limited to 70 °C and YJV (XLPE) to 90 °C.
• Q8: What is the difference between RVV and RVVP? RVV is the plain unshielded round flexible cord. RVVP adds a tinned-copper braid screen for electromagnetic interference rejection — choose the shielded variant when the circuit carries low-level signals or is routed near noisy equipment.
• Q9: Why does finished diameter vary between manufacturers for the same nominal size? Standards set minimum insulation and sheath thicknesses plus electrical performance, but not a precise overall diameter. Stranding compaction, filler design and sheath tolerance differ between plants — published 3×4.0 figures cluster around 12.7 mm — so the actual measured diameter must be used when sizing glands and clips.
• Q10: Which tests confirm acceptability on delivery and before energisation? At delivery, verify the factory test certificate (resistance ≤ 4.95 Ω/km, 2.0 kV/5 min withstand, dimensions ≈ 12.7 mm), jacket legibility and reel integrity. After installation, complete an insulation-resistance test plus a 2.0 kV AC / 5 min withstand, then confirm all three conductors identified correctly before energising.
• Q11: What service life can be expected? When installed and operated within the stated temperature and voltage limits, PVC flexible cords are designed for a service life of around 10–15 years in dry indoor conditions; sustained overload, repeated flexing beyond the 6 × OD minimum radius, ultraviolet exposure, or operation above 70 °C will materially shorten that life.