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Shops write it as 7/.064 — two aluminium conductors of seven 0.064″ strands each, PVC insulated and sheathed to 450/750 V. It carries 66 A on BS 7671 reference method C, about 14.5 kW at 220 V single phase. This is the cable most electricians mean when they ask for 16 mm service wire: the single-phase meter drop for a house whose load or run length has outgrown 10 mm². Drawn on the Pilone line in Lahore.
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| Property | Value |
|---|---|
| Conductor | Plain aluminium, class 2 stranded |
| Nominal area | 16 mm² × 2 cores |
| Strand construction | 7 / 0.064″ per core |
| Max conductor resistance at 20°C | 1.91 Ω/km |
| Current capacity (method C, 2 loaded) | 66 A |
| Voltage rating | 450/750 V |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor aluminium weight | ≈ 86.4 kg/km (2 × 43.2 kg/km) |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
On a 2-core single-phase run the current leaves on the line and returns on the neutral, so the drop is 2 × current × length × resistance ÷ 1000, using the 1.91 Ω/km in the table above.
A 60 A single-phase load with 30 m between the meter box and the main board: 2 × 60 × 30 × 1.91 ÷ 1000 = 6.9 V. That is 3.1% of 220 V, inside the 5% BS 7671 allows on a power circuit — 11 V here. The same 60 A spends the whole 11 V at 11 × 1000 ÷ (2 × 60 × 1.91) = 48 m, and at this cable's full 66 A the limit tightens to 44 m.
Note what the smaller size does at the same load: 10 mm² aluminium is tabulated at 48 A, so a 60 A load rules it out on heat before the volt sum is even reached. That is one honest reason to step up. Distance is the other: at 40 A over 60 m the 10 mm² pair drops 2 × 40 × 60 × 3.08 ÷ 1000 = 14.8 V, past the 11 V budget, where the same run on 16 mm² comes to 2 × 40 × 60 × 1.91 ÷ 1000 = 9.2 V and clears it. Both figures use the IEC 60228 resistance at 20 °C; a conductor working near its 70 °C rating has more resistance, so leave margin and confirm your run in the voltage drop calculator.
Meter to main board where 10mm is short on current — 66 A, about 14.5 kW at 220 V.
A meter box on the boundary wall and a house set back from it — the larger section buys the volts back.
Single-phase feeders to shops and small commercial units on fixed clipped runs.
Two kinds of buyer come to this size. One is the house with a heavy single-phase load — several air conditioners, a pump, a big geyser — where a 10 mm² drop is at its 48 A ceiling. The other is the long drop: a boundary-wall meter box, a house set well back, and 30 metres or more of cable in between. Both are fixed runs, terminated at two ends, which is the work aluminium does well and cheaply. It is not for the circuits behind the main board — sockets and lights belong in copper, where small conductors take repeated bending and tight screw terminals.
Three phases plus a neutral is a different cable: 16mm 4 core aluminium cable at 59 A. Below this on the same single-phase job is 10mm 2 core aluminium cable at 48 A. We make insulated aluminium power cable, not bare overhead conductor. For the copper equivalent and the size penalty aluminium pays, read copper vs aluminium cable.
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