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Solar installers buy single-core 4mm² for the DC side of a small rooftop system: the string links between modules and the positive-and-negative pair that runs down to the inverter. One string of panels typically pulls 9–13 A — read your module label — against the 36 A this conductor is rated for, so two strings can share one run and still sit inside the figure. Class 5 flexible copper, 56 strands of 0.30 mm, 4.95 Ω/km, 11 mV/A/m. 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 × 1 core |
| Strand construction | 56 / 0.30 mm (typical) |
| Max conductor resistance at 20°C | 4.95 Ω/km |
| Current capacity (single conductor, DC reference) | 36 A |
| Voltage drop | 11 mV/A/m |
| Voltage rating | 1000 V DC |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor copper weight | ≈ 35.6 kg/km |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
Worked example, using the two numbers in the table above. A string drawing 12 A over a 25 m route from the roof array down to the inverter loses 12 × 25 × 11 ÷ 1000 = 3.3 V on this cable. The tabulated 11 mV/A/m already covers both legs of the circuit, positive and negative, so the route length is counted once, not doubled. On a string sitting at roughly 400 V that is 0.8% — take the string voltage from your inverter's MPPT window rather than assuming it. Load the same 25 m run to the full 36 A and the drop is 36 × 25 × 11 ÷ 1000 = 9.9 V. On a short rooftop run it is current, not distance, that pushes 4mm² up to the next size.
Series links between modules and the tails into a combiner box. A single string at 9–13 A sits well inside the 36 A figure.
The positive and negative pair from a house or shop roof down to the inverter, where the route is short and stays inside conduit.
Two 12 A strings paralleled make 24 A, inside 36 A. A third takes you to 36 A with no margin left — that is the point to move up to 1 core 6mm DC cable.
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