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Three 25 mm² class 2 copper conductors, 7 strands of 2.14 mm per core, PVC insulated and sheathed to 450/750 V. 96 A with three loaded conductors on reference method C, 0.727 Ω/km, 1.75 mV/A/m — about 66 kVA on a 400 V three-phase supply. This is the three-phase feeder that carries no neutral: starter panel to tubewell motor, compressor or lift machine room. About 60 kg of copper in a 90 m coil. Drawn 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.
25mm 3 core cable is quoted at the day's copper rate, per metre.
25 mm² 3 core standard cable is quoted at the day's copper rate, per metre — the rupee figure moves with copper and is fixed on the day you order, so send the length in metres and your city on WhatsApp and today's number comes back. What the rate buys depends on how the cable is wired. Three phases with no neutral puts all three conductors under load and it carries 96 A on BS 7671 reference method C at 30°C, about 66 kVA at 400 V. Wired as line, neutral and earth instead, only two conductors are loaded and the same cable carries 112 A.
Ask four shops for 25 mm cable and four numbers come back in four different units. One quotes a bare figure with no unit at all. One quotes per foot, which always sounds cheaper because a foot is under a third of a metre. One quotes a whole coil without saying how long the coil is. Put every quote on a per-metre footing before you compare them — and say the core count while you are at it, because 25mm wire tells a shopkeeper the conductor size and nothing at all about how many cores you want.
| 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 |
A coil is a container, not a quantity. Get the metre count written on the invoice before you pay rather than after, because a short coil is the quietest way a per-coil price stops being the price you worked out. We quote per metre against the length you give us: send the metres and your city and one number comes back. The price per meter page works through every conversion, and how cable is priced in Pakistan explains why the figure moves from one week to the next.
There are two answers, and the circuit picks between them rather than the cable. Three phases with no neutral loads all three conductors, and the cable carries 96 A clipped direct at 30°C — about 66 kVA on a 400 V supply (1.732 × 400 × 96 ÷ 1000). Line, neutral and earth loads only two of them, and the figure rises to 112 A, about 24.6 kVA at 220 V (112 × 220 ÷ 1000). An earth conductor carries nothing in normal service, which is why it does not count toward the heating.
| Size | Strands (class 2) | Current capacity | Voltage drop | 5% limit at full load | Copper in a 90 m coil |
|---|---|---|---|---|---|
| 6 mm² | 7/1.04 | 41 A | 7.3 mV/A/m | 67 m | 14 kg |
| 10 mm² | 7/1.35 | 57 A | 4.4 mV/A/m | 80 m | 24 kg |
| 16 mm² | 7/1.70 | 76 A | 2.8 mV/A/m | 94 m | 38 kg |
| 25 mm² | 7/2.14 | 96 A | 1.75 mV/A/m | 119 m | 60 kg |
| 35 mm² | 19/1.53 | 119 A | 1.25 mV/A/m | 134 m | 84 kg |
On a single-phase run the budget is tighter, because 5% of 220 V is 11 V rather than 20. A 90 A single-phase load 30 m from the board drops 90 × 30 × 1.75 ÷ 1000 = 4.7 V, comfortably inside it. Load the same cable to its full 112 A and the 11 V is gone at 11 ÷ (112 × 1.75 ÷ 1000) = 56 m. That is the catch worth knowing: wired single-phase this cable carries more current but tolerates a shorter run before the volts, not the heat, decide the size.
Both figures assume the cable is clipped direct in open air at 30°C. Pull it through conduit, bundle it with other circuits, or run it under a Lahore roof in June and it carries less. BS 7671 handles that by multiplying the tabulated figure by correction factors for ambient temperature and grouping. We publish the tabulated number and the method rather than one invented “real world” figure, because the factor depends on your installation. 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 | 25 mm² × 3 cores |
| Strand construction | 7 / 2.14 mm per core (typical) |
| Max conductor resistance at 20°C | 0.727 Ω/km |
| Current capacity (method C, 3 loaded) | 96 A |
| Voltage drop | 1.75 mV/A/m |
| Voltage rating | 450/750 V |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor copper weight | ≈ 666.9 kg/km (3 × 222 kg/km) |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
A good part of the Pakistani trade still orders by strand code rather than by mm², and the code is readable once you know it says two things: how many strands, and how thick each strand is in inches. 19/.052 is nineteen strands of 0.052 inch wire. The arithmetic is one line and you can check any code with it: 0.052 × 25.4 = 1.321 mm across, area = 0.7854 × 1.321² = 1.37 mm² per strand, × 19 = 26 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 |
Ask for 25 mm cable, for 25mm wire, or for 19/.052, and you are asking for the same conductor — wire and cable mean the same thing at this size, and neither word tells the counter how many cores you need. Say “three core” as well or you will be handed whatever is nearest. This cable is sold as 25 mm², and both computed areas for that name are printed above: the metric 7/2.14 build in the specification table, and the older imperial 19/.052 build at 26 mm². Down at 7/.064 the arithmetic runs the other way, 14.5 mm² sold as 16. The wire strand codes guide carries the full vocabulary.
Starter panel to a three-phase tubewell or booster motor. The motor takes three phases and an earth at the frame — no neutral goes down the run.
Fixed supply to a workshop lathe, an air compressor or a textile machine drawing up to the 96 A this cable carries.
Panel to panel where every circuit downstream is three-phase, so the neutral has nothing to return and can be left out.
The buyer for this build is almost always doing one job: getting three phases to a motor. A tubewell contractor, a factory maintenance electrician, a lift installer. Three core at 25 mm² carries the three phases and nothing else — the earth goes to the frame separately, which is normal practice on motor work and is why the 4-core version would just be a spare conductor sitting in the sheath. Where the load downstream is a mix of single-phase circuits, the neutral has to be there and the right cable is 25mm 4 core cable. For a single-phase incomer, 25mm 2 core standard cable at 112 A. One step down in the same three-core build is 16mm 3 core cable at 76 A, and the sizing question in general is worked through on the three-phase cable size page.
Worked example — a 70 A motor 45 m from the starter.
Voltage drop is current × length × the tabulated 1.75 mV/A/m, divided by 1000. So 70 × 45 × 1.75 ÷ 1000 = 5.5 V, which is 1.4% of 400 V — well inside the 5% BS 7671 allows on a power circuit, 20 V here. Load the same cable to its full 96 A and the 20 V budget is spent at 20 ÷ (96 × 1.75 ÷ 1000) = 119 m. Beyond that the run length picks the size, not the motor — check yours with the voltage drop calculator.
Core count follows the circuit, not the load. The conductor is the same 25 mm² copper in all three builds; what changes is how many of the conductors are carrying current, and that changes the current capacity. Two core runs line and neutral with the earth taken separately. Three core runs either three phases with no neutral, or a single-phase circuit with its earth. Four core runs three phases plus a neutral, which is what a mixed single-phase load downstream needs.
| Cores | What runs in it | Loaded | Current capacity |
|---|---|---|---|
| 2 core | Line and neutral, earth run separately | 2 | 112 A |
| 3 core | Three phases with no neutral — or line, neutral and earth | 3 or 2 | 96 A / 112 A |
| 4 core | Three phases plus neutral | 3 | 96 A |
The same size in the other two builds: 25mm 4 core cable and 25mm 2 core standard cable. One step down in the same three-core build is 16mm 3 core cable at 76 A, then 10mm 3 core cable at 57 A. Above 25 mm² the larger sections are made in aluminium cable — the metal some shops call “silver cable”, which is aluminium, not silver, and needs a larger section than copper for the same current.
25 mm² is not 2.5 mm². They are a factor of ten apart in copper and they do completely different jobs: 25 mm² is a submain or motor feeder at 96 A, 2.5 mm² is house wiring at 24 A. Say the decimal out loud when you order, because 25mm cable and 2.5mm cable sound alike across a counter. If the size you want is the small one, go to 2.5mm 3 core flexible cable.
“Full gauge” is a claim on a lot of listings and it almost never arrives with a test you can run. Here are three you can run yourself, on any seller's cable including ours. They need a weighing scale, a tape and a vernier, and they take about ten minutes.
Conductor mass = area × cores × 8.89 kg/km per mm². For 25 mm² 3 core that is 25 × 3 × 8.89 = 667 kg/km, so a 90 m coil holds about 60 kg of copper before insulation and sheath.
Cut the end square. A 25 mm² class 2 core is 7 strands of about 2.14 mm. Fewer strands, or a thinner strand, means 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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