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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.
4mm 4 core cable is quoted at the day's copper rate, per metre.
4 mm² 4 core standard cable is quoted at the day's copper rate, per metre — send the metres and your city on WhatsApp and today's number comes back. Three of the four conductors are loaded on a three-phase circuit, so the cable carries 32 A on BS 7671 reference method C at 30°C, about 22.2 kVA at 400 V. In the trade this size is still ordered as 7/.036, which computes to 4.6 mm² and is sold as 4.
Quotes for 4mm cable come back per metre, per foot and per coil, and the unit is often left out. Per foot always sounds cheapest because a foot is under a third of a metre. A coil price says nothing until you know the coil's length. Reduce every quote to a rate per metre before you compare, and say the core count — at 4 mm² the two, three and four core builds all sit on the same shelf.
| Quoted as | Length in metres | To get the per-metre rate |
|---|---|---|
| Per metre | 1 m | Nothing to do |
| Per foot | 0.305 m | Multiply the per-foot rate by 3.281 |
| Per yard | 0.914 m | Multiply the per-yard rate by 1.094 |
| Per 90 m coil | 90 m (295 ft) | Divide the coil price by 90 |
| Per 45 m half coil | 45 m (148 ft) | Divide by 45 |
| Per 100 m drum | 100 m (328 ft) | Divide by 100 |
Coil lengths are not standardised in Pakistan, so get the metre count written on the invoice before you pay rather than after. We quote per metre against the length you give us. The price per meter page covers every conversion, and how cable is priced in Pakistan explains why the rate moves with copper.
32 A with three conductors loaded, 36 A with two, clipped direct at 30°C. That 32 A is about 22.2 kVA on a 400 V supply (1.732 × 400 × 32 ÷ 1000) — the size that typically feeds a small three-phase motor, a shop unit or a submain to an outbuilding.
| Size | Strands | 2 loaded | 3 loaded | Voltage drop | Copper in a 90 m coil |
|---|---|---|---|---|---|
| 1.5 mm² | 7/0.53 | 19.5 A | 17.5 A | 29 mV/A/m | 4.8 kg |
| 2.5 mm² | 7/0.67 | 27 A | 24 A | 18 mV/A/m | 8.0 kg |
| 4 mm² | 7/0.85 | 36 A | 32 A | 11 mV/A/m | 13 kg |
| 6 mm² | 7/1.04 | 46 A | 41 A | 7.3 mV/A/m | 19 kg |
| 10 mm² | 7/1.35 | 63 A | 57 A | 4.4 mV/A/m | 32 kg |
| 16 mm² | 7/1.70 | 85 A | 76 A | 2.8 mV/A/m | 51 kg |
Voltage drop at 11 mV/A/m is what usually limits this size rather than heat. At the full 32 A the 20 V that BS 7671's 5% allows on a 400 V circuit is spent at 57 m; on a single-phase run at 36 A the 11 V budget is gone at 28 m. Those distances are short enough that a submain to the far end of a plot often wants 6 mm² even though the load would sit inside 4.
All of these are clipped-direct figures at 30°C. Pull the cable through conduit, bundle it with other circuits, or run it under a Lahore roof in June and it carries less — BS 7671 handles that with correction factors rather than one invented figure. Work yours out with the cable size calculator and the voltage drop calculator, then have a licensed electrician confirm it.
| 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) |
Much of the Pakistani trade still orders by strand code, and the code says two things: how many strands, and how thick each one is in inches. 7/.036 is seven strands of 0.036 inch wire. The arithmetic checks any code: 0.036 × 25.4 = 0.914 mm across, area = 0.7854 × 0.914² = 0.66 mm² per strand, × 7 = 4.6 mm².
| Code | Strand diameter | Computed area | Sold as |
|---|---|---|---|
| 3/.029 | 0.737 mm | 1.29 mm² | 1.5 mm² |
| 7/.029 | 0.737 mm | 3.0 mm² | 2.5 mm² |
| 7/.036 | 0.914 mm | 4.6 mm² | 4 mm² |
| 7/.044 | 1.118 mm | 6.9 mm² | 6 mm² |
| 7/.052 | 1.321 mm | 9.6 mm² | 10 mm² |
| 7/.064 | 1.626 mm | 14.5 mm² | 16 mm² |
| 19/.052 | 1.321 mm | 26 mm² | 25 mm² |
So 7/.036 computes to 4.6 mm² and is sold as 4 mm² — the imperial code sits slightly above the metric name it is sold under, and the specification table above gives the metric 7/0.85 build this cable is actually made to. Ask for 4mm cable or for 7/.036 and you are asking for the same conductor; add the core count or you will be handed whichever build is nearest. The wire strand codes guide carries the full vocabulary, and 4mm vs 6mm cable covers the step up.
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.
Core count follows the circuit, not the load. Two core is line and neutral with the earth taken separately. Three core is line, neutral and earth, or three phases without a neutral. Four core is three phases plus a neutral. The conductor is the same 4 mm² copper throughout; only the number of loaded conductors changes.
| Cores | What runs in it | Loaded | Current capacity |
|---|---|---|---|
| 2 core | Line and neutral, earth run separately | 2 | 36 A |
| 3 core | Line, neutral and earth — or three phases, no neutral | 2 or 3 | 36 A / 32 A |
| 4 core | Three phases plus neutral | 3 | 32 A |
The same size in the other builds: 4mm 2 core standard cable and 4mm 3 core standard cable. One step up in the same four-core build is 6mm 4 core standard cable at 41 A, then 10mm 4 core cable at 57 A. Where the run has to flex, the class 5 equivalent is 4mm 4 core flexible cable.
“Full gauge” is a claim that rarely arrives with a test attached. Here are three you can run yourself on any seller's cable, ours included.
Conductor mass = area × cores × 8.89 kg/km per mm². For 4 mm² 4 core that is 4 × 4 × 8.89 = 142 kg/km, so a 90 m coil holds about 12.8 kg of copper before insulation and sheath.
Cut the end square. A 4 mm² class 2 core is 7 strands of about 0.85 mm. Seven strands of a visibly thinner wire is a smaller conductor whatever the sheath is printed with.
Get the metre count in writing before you pay, then check it with a measuring wheel. A short coil is the quietest way a per-coil price stops being the price you calculated.
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