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Two 4 mm² class 5 conductors, 56 strands of 0.30 mm each, PVC insulated and sheathed to 300/500 V. 36 A with both conductors loaded on reference method C, 11 mV/A/m, 4.95 Ω/km — about 7.9 kW at 220 V. This is the step up from 2.5 mm² flex: pump drops, heavy extension boards, AC point tails. The size the trade still names by the old code 7/.036. Drawn on the Pilone line in Lahore.
Prices track the daily copper rate. Bulk and coil pricing on request.
Check the coil before you pay for it
Every coil leaves our factory with a QR code printed on the packaging. Scan it and the factory record for that batch opens: brand, cable size, batch number, year of manufacture and conductor. Compare the batch number on screen with the one printed on your coil — if the two do not match, it did not come from us.
| Property | Value |
|---|---|
| Conductor | Plain annealed copper, class 5 flexible stranded |
| Nominal area | 4 mm² × 2 cores |
| Strand construction | 56 / 0.30 mm per core (typical) |
| Max conductor resistance at 20°C | 4.95 Ω/km |
| Current capacity (method C, 2 loaded) | 36 A |
| Voltage drop | 11 mV/A/m |
| Voltage rating | 300/500 V |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor copper weight | ≈ 71.2 kg/km (2 × 35.6 kg/km) |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC flexible cables) |
Panel to a surface or submersible motor where the run is long enough that 2.5 mm² would spend its voltage budget before it arrives.
Isolator to the indoor or outdoor unit on a 1.5 or 2 ton split, on a dedicated MCB with the earth run separately.
Site boards feeding welders, grinders and compressors, where the lead is dragged and re-coiled daily.
The people who buy this size are pump mechanics and AC installers. Both jobs have the same shape: a fixed board at one end, a machine at the other, and a lead in between that has to bend without the conductor breaking up. Fifty-six strands of 0.30 mm per core is what makes that possible — the same 4 mm² in class 2 has only seven thick strands and will not take repeated flexing. Two core carries line and neutral only, so the earth has to arrive separately; if it needs to be inside the sheath, use 4mm 3 core flexible cable. For a run buried in a wall or clipped in conduit, the class 5 build is the wrong family and 4mm 2 core standard cable is the right one. Sizing for an air conditioner is worked through on the 1.5 ton AC cable size guide.
Worked example — a 16 A pump 30 m from the panel.
Voltage drop is current × length × the tabulated 11 mV/A/m, divided by 1000. So 16 × 30 × 11 ÷ 1000 = 5.3 V, which is 2.4% of 220 V — inside the 5% BS 7671 allows on a power circuit, 11 V here. Load the same lead to its full 36 A and the 11 V budget is spent at 11 ÷ (36 × 11 ÷ 1000) = 27 m. The same 16 A load on 2.5 mm² flex would drop 16 × 30 × 18 ÷ 1000 = 8.6 V, which is why the jump to 4 mm² is a length decision as often as a load one. Check yours with the voltage drop calculator.
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