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Two 2.5 mm² class 5 conductors, 50 strands of 0.25 mm each, PVC insulated and sheathed. 27 A with both conductors loaded on reference method C, 18 mV/A/m, 7.98 Ω/km. This is the two-core flex that goes on AC points, appliance tails and extension boards — the size the trade still orders as 7/.029. Drawn on the Pilone line in Lahore.
Prices track the daily copper rate. Coil and bulk 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.
2.5mm 2 core flexible cable is quoted at the day's copper rate, per metre.
2.5 mm² 2 core flexible 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. Two core is line and neutral, so both conductors are loaded and the cable carries 27 A on BS 7671 reference method C at 30°C, about 5.9 kVA at 220 V. On 50 strands of 0.25 mm class 5 copper it coils and uncoils without the cores work-hardening, which is what separates it from the socket-circuit build of the same size.
Small sizes are where per-foot quoting hides best, because the difference between a per-foot and a per-metre rate looks like rounding at these numbers when it is actually a factor of about three. Convert every quote to a rate per metre before comparing. Say the decimal clearly too: 2.5mm and 25mm sound alike across a counter and are ten times apart in copper.
| 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. 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.
27 A on two loaded conductors, clipped direct at 30°C — about 5.9 kVA at 220 V (27 × 220 ÷ 1000). That is an extension lead, an appliance tail or a portable tool feed, and it is a short-run cable: at 18 mV/A/m the volts go quickly.
| Size | Strands (class 5) | 2 loaded | 3 loaded | Voltage drop | Copper in a 90 m coil |
|---|---|---|---|---|---|
| 1.5 mm² | 30/0.25 | 19.5 A | 17.5 A | 29 mV/A/m | 2.4 kg |
| 2.5 mm² | 50/0.25 | 27 A | 24 A | 18 mV/A/m | 4.0 kg |
| 4 mm² | 56/0.30 | 36 A | 32 A | 11 mV/A/m | 6.4 kg |
| 6 mm² | 84/0.30 | 46 A | 41 A | 7.3 mV/A/m | 9.6 kg |
| 10 mm² | 80/0.40 | 63 A | 57 A | 4.4 mV/A/m | 16 kg |
| 16 mm² | 126/0.40 | 85 A | 76 A | 2.8 mV/A/m | 26 kg |
At its full 27 A the 11 V that BS 7671's 5% allows on a 220 V circuit is spent at 23 m. That is the number behind the site-lead rule of thumb: a long extension on a small cable will drop volts long before it gets warm, and the tool at the far end runs badly rather than safely. A 13 A load on the same cable reaches 11 ÷ (13 × 18 ÷ 1000) = 47 m, which is why the same drum is fine for a drill and not for a welder.
Clipped-direct figures at 30°C. A flexible cable loaded while wound on its drum cannot shed heat — this is the size where that mistake actually starts fires, because the whole drum is often left coiled under a bench. Run it out before you load it. Conduit, bundling and high ambient take another bite each. 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 5 flexible stranded |
| Nominal area | 2.5 mm² × 2 cores |
| Strand construction | 50 / 0.25 mm per core (typical) |
| Max conductor resistance at 20°C | 7.98 Ω/km |
| Current capacity (method C, 2 loaded) | 27 A |
| Voltage drop | 18 mV/A/m |
| Voltage rating | 300/500 V |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor copper weight | ≈ 44.4 kg/km (2 × 22.2 kg/km per core) |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
Same copper, same 2.5 mm², different stranding. Class 5 divides the area into 50 strands of 0.25 mm; class 2 uses 7 strands of 0.67 mm. Thin strands slide past each other as the cable bends, so the conductor survives being coiled and dragged. A class 2 core flexed often enough work-hardens and breaks inside a sheath that looks perfectly sound.
| Property | Class 5 (flexible) | Class 2 (standard) |
|---|---|---|
| Strands | 50/0.25 | 7/0.67 |
| Max resistance | 7.98 ohm/km | 7.41 ohm/km |
| Current capacity | 27 A | 27 A |
| Bends repeatedly | Yes | No |
| Typical use | Extension leads, appliance tails | Socket circuits in conduit |
This is the distinction people get wrong most often at 2.5 mm², because both builds are sold as “2.5 mm wire”. Flexible is for cable that moves. For the socket circuits of a house, buried in conduit and never touched again, the class 2 build is correct and cheaper — the 2.5mm cable page sets out where the size belongs.
The tail from an isolator or 16 A socket to a room AC, a water cooler or a washing machine, where the earth is already run.
Site boards and portable leads. Fifty 0.25 mm strands per core take daily coiling and uncoiling without the conductor breaking up.
Fitting drops off a lighting circuit, and small single-phase motors inside the 27 A rating where the lead moves with the machine.
Most of this coil leaves the factory to two kinds of buyer: the AC installer who needs a tail from the isolator to the indoor unit, and the shop making up extension boards by the dozen. Two core means line and neutral, and nothing else. The earth has to arrive some other way — the conduit's own earth conductor, or a separate green wire — so this build belongs on circuits where that earth already exists at both ends. If the appliance needs its earth inside the same sheath, the answer is 2.5mm 3 core flexible cable. At 27 A this cable carries about 5.9 kW on a 220 V single-phase supply (220 × 27 ÷ 1000), which covers almost any single point in a house but is nowhere near a submain. One caution on the name: this is 2.5 mm², not 25 mm². The two sound alike across a counter and differ by a factor of ten in copper — the submain size is 25mm 2 core standard cable.
Worked example — how far this cable will reach.
Voltage drop is current × length × the tabulated 18 mV/A/m, divided by 1000. A 10 A appliance point 18 m from the board drops 10 × 18 × 18 ÷ 1000 = 3.24 V, which is 1.5% of 220 V — well inside the 5% BS 7671 allows on a power circuit, 11 V here. Push the same cable to its full 27 A and the drop reaches 11 V at 11 ÷ (27 × 18 ÷ 1000) = 22 m. Past that distance the run length picks the size, not the load — check yours with the voltage drop calculator.
Core count follows the circuit. Two core is line and neutral, with the earth taken separately or not present at all on a double-insulated appliance. Three core adds the protective conductor in the same sheath, which is what most portable equipment needs. Four core carries three phases plus a neutral. Same 2.5 mm² conductor in each.
| Cores | What runs in it | Loaded | Current capacity |
|---|---|---|---|
| 2 core | Line and neutral, earth separate or not required | 2 | 27 A |
| 3 core | Line, neutral and earth — or three phases, no neutral | 2 or 3 | 27 A / 24 A |
| 4 core | Three phases plus neutral | 3 | 24 A |
The same size in the other builds: 2.5mm 3 core flexible cable and 2.5mm 4 core flexible cable. One step up in the same two-core flexible build is 4mm 2 core flexible cable at 36 A; one step down, 1.5mm 2 core flexible cable at 19.5 A.
2.5 mm² is not 25 mm². They are a factor of ten apart in copper and do completely different jobs: 2.5 mm² is a socket circuit, 25 mm² is a submain or motor feeder at 96 A. Say the decimal out loud when you order, because the two sound alike across a counter. If the size you want is the large one, go to 25mm 4 core cable.
A coil of this size weighs almost nothing, which is precisely why the metre count is worth checking rather than trusting. Three tests, ten minutes.
Conductor mass = area × cores × 8.89 kg/km per mm². For 2.5 mm² 2 core that is 2.5 × 2 × 8.89 = 44 kg/km, so a 90 m coil holds only about 4 kg of copper before insulation and sheath.
A class 5 core at this size is about 50 strands of 0.25 mm. Cut the end square and count under good light. Fewer, thicker strands means a class 2 conductor being sold as flexible.
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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