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Four 4 mm² class 2 conductors under one PVC sheath — three phases and a neutral — 7 strands of 0.85 mm per core, the size the counter still orders as 7/.036. 32 A with three loaded conductors, 4.61 Ω/km, 450/750 V. This is the smallest four core we build in the standard class 2 range: one cable and one gland to feed a workshop board or a small three-phase motor, about 22 kVA at 400 V. Made 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 2 stranded |
| Nominal area | 4 mm² × 4 cores |
| Strand construction | 7 / 0.85 mm per core (typical) |
| Max conductor resistance at 20°C | 4.61 Ω/km |
| Current capacity (method C, 3 loaded) | 32 A |
| Voltage drop | 11 mV/A/m |
| Voltage rating | 450/750 V |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor copper weight | ≈ 142 kg/km (4 × 35.6 kg/km) |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
The buyer for this one almost always has a three-phase connection on a small premises: a workshop with a lathe and a compressor, a shop taking its own sub-board off the main panel, a tubewell starter a short walk from the meter. Four cores means three phases plus the neutral in one sheath, so a 400 V board is fed with one cable and one gland instead of four singles in conduit. 32 A with three loaded conductors, clipped direct at 30°C — about 22 kVA on a 400 V supply (1.732 × 400 × 32 ÷ 1000). Wire the same cable single-phase and only two conductors are loaded, which lifts it to 36 A. The imperial code for this size is 7/.036, computing to 4.6 mm² of copper; both numbers are worked out on the 7/.036 single core page.
Main panel to a shop, annexe or workshop board where the diversified total stays under 32 A — roughly 22 kVA at 400 V.
Fixed runs to three-phase pumps and compressors. Size on the full-load amps printed on the motor plate, not on the horsepower on the box.
Clipped or in trunking to a fixed machine. If the tail has to move or coil, the class 5 build is the one to use, not this.
Worked example, from the table above. A 4 kW three-phase motor at 400 V and 0.85 power factor draws 4000 ÷ (1.732 × 400 × 0.85) = 6.8 A — read the plate on your own motor, because that figure is the one to size on. Over a 40 m run the drop is 6.8 × 40 × 11 ÷ 1000 = 3.0 V, against the 20 V that BS 7671's 5% allows on a 400 V power circuit. Push the same cable to its rated 32 A and that 20 V arrives at 20000 ÷ (32 × 11) = 57 m. Under that length the load picks the size; past it the run does, and the next step is 6mm 4 core cable at 41 A and 7.3 mV/A/m.
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