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One stranded copper conductor, PVC insulated to 450/750 V, ordered at the counter as 7/.044. The code is imperial: 7 strands of 0.044 inch, and 0.044 × 25.4 = 1.118 mm across each strand — 0.98 mm² a strand, 6.9 mm² for all seven, sold as 6 mm² by the whole market including us. 46 A with two conductors loaded, 3.08 Ω/km. Drawn on the Pilone line in Lahore.
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| Property | Value |
|---|---|
| Conductor | Plain annealed copper, stranded |
| Nominal area | 6 mm² × 1 core |
| Strand construction | 7/.044 (catalog code); 7 × 1.04 mm class 2 reference |
| Max conductor resistance at 20°C | 3.08 Ω/km |
| Current capacity (method C, 2 loaded) | 46 A |
| Voltage drop | 7.3 mV/A/m |
| Voltage rating | 450/750 V |
| Insulation | PVC, 70°C conductor rating |
| Conductor copper weight | ≈ 53.3 kg/km |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
Single core is how most Pakistani houses are actually wired. The conduit goes in with the plaster and the wires are pulled through afterwards, one for line, one for neutral, one for earth. On that job this is the heavy-circuit size: the AC points, the geyser, the cooker, and on a smaller connection the run from the meter to the distribution board — while 7/.029 and 7/.036 take the sockets and the lights. 46 A with two conductors loaded, clipped direct at 30°C, is about 10 kVA at 220 V. Note the word clipped: four or five circuits sharing one conduit heat each other, and the grouping factor comes off that 46 A before you size anything.
Pulled into concealed conduit after the plaster, one wire per pole — the heavy circuits on a rewire rather than the lighting runs.
Line, neutral and earth pulled as separate wires in shared trunking, and internal wiring inside boards and starter panels.
The submain on a smaller domestic connection, where the whole board sits inside the 46 A this wire carries clipped direct.
Worked example, from the table above. A 30 A circuit — a board feeding an annexe, say — over a 20 m run drops 30 × 20 × 7.3 ÷ 1000 = 4.4 V, against the 11 V that BS 7671's 5% allows on a 220 V power circuit. That is 40% of the budget spent on one run. At the wire's full 46 A the 11 V arrives at 11000 ÷ (46 × 7.3) = 33 m, so past that distance the length picks the size and the next step is 10 mm², the code 7/.052. The rest of the ladder is in general wiring sizes.
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