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Points × average run × conductors per run, plus 15% for wastage, divided by 90 = coils. A compact single-storey house of 37 points needs about 1,378 m of single-core copper: 16 coils across the three wiring sizes, plus a 23 m cut length of 6 mm² for the main earth.
There is no figure that follows from plot size alone, because the three inputs above are what the plot does not tell you: how many points you are wiring, how far each one sits from the board, and how many conductors each run carries. Count those three off your own layout and the arithmetic below turns them into a coil list you can hand to a supplier. The full bill for a given plot — point schedule, storey delta, cost scope — sits on that plot's own guide.
This is the derivation almost nobody publishes. Every quantity on a typical house wiring list is asserted with no point count, no run length and no conductor count behind it, which is why two lists for the same house can differ several times over and neither can be adjusted to yours.
Every light, fan, socket, AC, geyser and pump position on the approved layout. Count switches as part of the point they control. This is the input that moves the total most, so count it, do not estimate it.
The one-way route from the distribution board to a typical point, in metres, following the conduit and not the straight line. Take it as the floor's diagonal less about 15%: a 950 sq ft floor is roughly 25 × 38 ft, whose diagonal is 45.5 ft or 13.9 m, giving about 12 m.
2.5 on lighting and fan circuits, where switch legs share a neutral. 3 on socket and appliance circuits, which each carry live, neutral and earth. Use 1 for the single main earthing conductor.
10–20% on top for cutting waste, failed pulls and the drops you did not draw. 15% is the working figure below. Add it before you convert to coils, not after.
Multiplied out: conductor metres = P × L × C, then × 1.15, then ÷ 90 for coils. Do it once per cable size, not once for the house, because you cannot buy a part-coil of one size with the leftover of another.
Take a single-storey house of about 900 sq ft covered area, wired to 37 points on 9 circuits, distribution board central, all runs in conduit. Fill your own numbers into the same rows.
| Circuit | Points | Average run | Conductors | Size | Conductor metres |
|---|---|---|---|---|---|
| Lighting and fans, front | 8 | 10 m | 2.5 | 1.5 mm² | 200 m |
| Lighting and fans, rear | 8 | 12 m | 2.5 | 1.5 mm² | 240 m |
| Room sockets, front | 6 | 11 m | 3 | 2.5 mm² | 198 m |
| Room sockets, rear | 6 | 13 m | 3 | 2.5 mm² | 234 m |
| Kitchen | 5 | 9 m | 3 | 2.5 mm² | 135 m |
| Water pump | 1 | 15 m | 3 | 2.5 mm² | 45 m |
| AC point 1 | 1 | 14 m | 3 | 4 mm² | 42 m |
| AC point 2 | 1 | 16 m | 3 | 4 mm² | 48 m |
| Geyser point | 1 | 12 m | 3 | 4 mm² | 36 m |
| Main earthing conductor | — | 20 m | 1 | 6 mm² | 20 m |
| Total, before margin | 37 | — | — | — | 1,198 m |
Now the margin and the conversion, size by size. 1.5 mm²: 200 + 240 = 440 m, × 1.15 = 506 m, ÷ 90 = 5.6, so 6 coils. 2.5 mm²: 198 + 234 + 135 + 45 = 612 m, × 1.15 = 704 m, so 8 coils. 4 mm²: 42 + 48 + 36 = 126 m, × 1.15 = 145 m, so 2 coils. The 6 mm² earth is 20 m × 1.15 = 23 m, bought as a cut length rather than a coil. So the need is 1,378 m of conductor in total, and the order is sixteen coils plus that 23 m cut length — and every one of those numbers moves if your point count does.
Notice what the rounding costs. The three coil sizes need 506 + 704 + 145 = 1,355 m between them, and rounded per size they come as 6 + 8 + 2 = 16 coils, which is 1,440 m: 1,440 − 1,355 = 85 m of spare. The 6 mm² earth sits outside that sum entirely, because a 23 m cut length is not part of any coil. That 85 m is not waste; it is the reason a second coil of 4 mm² goes on the order rather than a short delivery stopping the job. Round up per size every time.
A standard coil of single-core house wire in Pakistan is 90 m, near enough 100 yards. That is the unit the trade buys in and the unit an electrician will quote back at you, while every technical source publishes metres. One conversion sits between them: metres ÷ 90, rounded up per size.
Coil length is also the number that quietly varies between suppliers, so confirm it in writing before you order — from us or from anyone else. Two checks settle it on delivery. A tape walked against a marked 10 m span is definitive. A faster screen is resistance: IEC 60228 caps 1.5 mm² class 2 copper at 12.1 Ω/km at 20 °C, so a full 90 m coil should read no more than 12.1 × 0.090 = 1.09 Ω end to end. Read that honestly: the standard sets a maximum, real copper reads under it, and a low reading can mean good copper or a short coil. Resistance flags a problem; the tape proves it. We quote per metre, so a coil count is a convenience conversion on our side rather than the unit of sale.
Counting points gives one answer. There is a second, independent route, and any estimate worth ordering against has to survive both. The trade rule is 1.5–2 ft of conduit run per square foot of plot; at 2–3 conductors pulled through each run, that converts to a band of conductor metres. If your counted figure falls outside the band for your plot, one of your three inputs is wrong.
| Plot | Plot area | Conduit runs | Conductor metres | Coils | Counted list |
|---|---|---|---|---|---|
| 3 marla | 675 sq ft | 309–412 m | 617–1,234 m | 7–14 | 3 marla cable list |
| 5 marla | 1,125 sq ft | 514–686 m | 1,029–2,057 m | 12–23 | 5 marla cable list |
| 7 marla | 1,575 sq ft | 720–960 m | 1,440–2,880 m | 16–32 | 7 marla cable list |
| 10 marla | 2,250 sq ft | 1,029–1,372 m | 2,057–4,114 m | 23–46 | 10 marla cable list |
| 1 kanal | 4,500 sq ft | 2,057–2,743 m | 4,114–8,229 m | 46–92 | 1 kanal cable list |
| 2 kanal | 9,000 sq ft | 4,114–5,486 m | 8,229–16,457 m | 92–183 | 2 kanal cable list |
One warning about the counted route on large plots. The average run stops growing with the plot once the house gets a second distribution board, because every final circuit then measures back to the nearest board, not to the main one. Keep multiplying by a whole-house diagonal on a kanal and the count will land far above the area band. On anything above about 10 marla, split the sheet per board and add a submain row between them.
Run the sheet twice, once per floor, and change three things on the upper one. The point count drops — there is no porch, no main entrance, no pump upstairs, so plan on about 85% of the ground floor's points. The average run shortens if the upper floor gets its own board. And a riser appears that the ground floor did not need: a submain from the main board to the upper board, sized on the load it feeds rather than on the floor area.
Lay the riser conduit before the plaster goes on. It is the one run that cannot be added later without breaking a wall from top to bottom, and it is the item most often left off a quantity list because it belongs to neither floor. Each plot guide carries its own single-versus-double-storey table.
The coils wire the house. They do not feed it. The run from the WAPDA or K-Electric meter to the distribution board is a separate multicore cable bought by the running foot, not by the coil, and it is missing from nearly every published wiring list. Size it on the sanctioned load off your meter card: a 7.5 kW single-phase connection is 7500 ÷ 220 = 34.1 A, which puts 10 mm² copper — 63 A, and 4.4 mV/A/m of drop — on a run of about 22 m before the voltage-drop budget is spent. Two-core for single phase, four-core for three phase.
The full rationale, including the aluminium alternative on long service runs, is on WAPDA meter cable size and main meter cable. Add its metres to the order as a cut length: 10mm 2 core cable for a single-phase house, 16mm 4 core aluminium cable where the run is long and the connection is three phase.
Three things decide whether the order arrives right, and none of them is the coil count.
Wire is pulled after the conduit is laid and before the plaster. The new-house wiring sequence sets out where it falls.
Send the coil count per size. A single total metre figure cannot be cut, priced or delivered as one thing.
A rewire re-uses some conduit and abandons the rest. Rewiring an old house carries the allowance.
We draw the copper in Lahore and sell it at the day's rate — no dealer margin. Send your points per circuit and your city: Punjab in 1–2 days, rest of Pakistan in 2–4.