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One 2.5 mm² class 5 core — the size the trade also calls 7/.029 — 50 strands of 0.25 mm, PVC insulated and rated 1000 V DC. 27 A, 7.98 Ω/km, 18 mV/A/m across the go-and-return pair. This is where a residential DC run starts to behave: string current in double figures, roof-to-board distance in tens of metres, and the volt drop still inside 3% on a high-voltage array. About 2.22 kg of copper in 100 m. Say the decimal when you order — this is 2.5 mm², not 25 mm². 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 | 2.5 mm² × 1 core |
| Strand construction | 50 / 0.25 mm (typical) |
| Max conductor resistance at 20°C | 7.98 Ω/km |
| Current capacity (single conductor, DC reference) | 27 A |
| Voltage drop | 18 mV/A/m |
| Voltage rating | 1000 V DC |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor copper weight | ≈ 22.2 kg/km |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
Panel-to-panel links and string runs down to the combiner or charge controller on a residential array, where the string voltage is high and the drop stays small.
Controller-side DC wiring on small and mid-size systems, and the links between isolators, fuses and terminals in a DC board.
Battery-side lighting and equipment circuits where the bank voltage is high enough that a few volts of drop is not the whole budget.
The 27 A is the heat limit. What sizes a DC run is the drop: current × route metres × 18 mV/A/m ÷ 1000, with the 18 already counting both the positive and the negative leg. A 9 A string over a 25 m roof-to-board route drops 9 × 25 × 18 ÷ 1000 = 4.05 V, which on a 250 V array is 1.6% — inside the 3% solar work is designed to, with room to spare. The same 9 A on a 48 V battery circuit has a budget of only 1.44 V, so it reaches 1.44 × 1000 ÷ (9 × 18) = 8.9 m. Run the cable at its full 27 A on that 48 V bank and you are down to 3.0 m. High string voltage buys distance; battery voltage does not, which is why inverter and battery runs go up to 6mm DC cable and larger.
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