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Three 4 mm² class 2 conductors under one PVC sheath — line, neutral and a protective earth — 7 strands of 0.85 mm per core, the size the counter still orders as 7/.036. 36 A with two conductors loaded, 4.61 Ω/km, 450/750 V. This is the fixed-wiring answer for an AC point, a geyser spur or an oven circuit that has to bring its own earth. Made on the Pilone line in Lahore.
Prices track the daily copper rate. Bulk and coil pricing on request.
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| Property | Value |
|---|---|
| Conductor | Plain annealed copper, class 2 stranded |
| Nominal area | 4 mm² × 3 cores |
| Strand construction | 7 / 0.85 mm per core (typical) |
| Max conductor resistance at 20°C | 4.61 Ω/km |
| Current capacity (method C, 2 loaded) | 36 A |
| Voltage drop | 11 mV/A/m |
| Voltage rating | 450/750 V |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor copper weight | ≈ 107 kg/km (3 × 35.6 kg/km) |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
This is a house and small-shop cable, not a plant cable. The buyer is usually an electrician wiring a new AC point or a geyser spur, or a homeowner putting a board in an annexe, and the reason for three cores rather than two is the earth: 4 mm² class 2 carries line, neutral and a protective earth in one sheath, so nothing depends on the conduit for earthing. 36 A with two conductors loaded, clipped direct at 30°C — about 7.9 kVA on a 220 V single-phase supply. The imperial code for this size is 7/.036, which computes to 4.6 mm² of copper; both numbers are worked out on the 7/.036 single core page.
Distribution board to a 1.5-ton split drawing 7–9 A, clipped or in conduit, on its own MCB rather than shared with sockets.
A 1500–3000 W electric geyser draws roughly 7–14 A at 220 V — check the rating plate, then give it a dedicated earthed radial.
Board to board where the total stays under 36 A, with the protective earth inside the same sheath as the supply.
Worked example, from the table above. A 2500 W geyser draws 2500 ÷ 220 = 11.4 A. Over a 30 m run from the distribution board the drop is 11.4 × 30 × 11 ÷ 1000 = 3.8 V — roughly a third of the 11 V that BS 7671's 5% allows on a 220 V power circuit. At that same 11.4 A the full 11 V is not reached until 11000 ÷ (11.4 × 11) = 88 m, so on a house-sized run the load sets the size, not the length. Longer runs and heavier loads belong on 6mm 3 core cable, which carries 46 A on the same two-loaded-conductor basis and drops 7.3 mV/A/m.
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