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Four 1.5 mm² class 5 conductors in one sheath — three phases plus neutral, or three control circuits plus a common, without pulling four separate wires. 30 strands of 0.25 mm per core, PVC to 300/500 V, tabulated at 17.5 A with three loaded conductors on method C at 30°C. That is about 12 kVA on a 400 V three-phase supply. Panel builders, pump installers and event crews buy this size: it is the smallest four core that still takes a proper crimp and survives being rolled up every week.
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.
1.5mm 4 core flexible cable is quoted at the day's copper rate, per metre.
1.5 mm² 4 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. Four cores with three of them loaded carries 17.5 A on BS 7671 reference method C at 30°C; with two loaded it is 19.5 A. This is the smallest four-core build we make, and at 29 mV/A/m it is a short-run cable: the voltage drop per amp-metre is sixteen times that of 16 mm², so length decides this size far more often than load does.
Small sizes are where per-foot quoting does the most damage, because the numbers are small enough that the difference looks like rounding. A foot is under a third of a metre, so a per-foot rate is always about a third of the per-metre rate for the same cable. Put every quote on a per-metre footing before comparing, and say “1.5 mm² four core flexible” in full — at this size the shop has six things within reach that nearly match.
| 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 down 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 what moves the rate.
17.5 A with three conductors loaded, 19.5 A with two, clipped direct at 30°C. On a 400 V three-phase supply 17.5 A is about 12.1 kVA (1.732 × 400 × 17.5 ÷ 1000) — enough for a small three-phase motor or a control panel, and not enough for much else.
| Size | Strands | 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 | 4.8 kg |
| 2.5 mm² | 50/0.25 | 27 A | 24 A | 18 mV/A/m | 8.0 kg |
| 4 mm² | 56/0.30 | 36 A | 32 A | 11 mV/A/m | 13 kg |
| 6 mm² | 84/0.30 | 46 A | 41 A | 7.3 mV/A/m | 19 kg |
| 10 mm² | 80/0.40 | 63 A | 57 A | 4.4 mV/A/m | 32 kg |
| 16 mm² | 126/0.40 | 85 A | 76 A | 2.8 mV/A/m | 51 kg |
Run length is the real constraint here. A 15 A three-phase load 20 m out drops 15 × 20 × 29 ÷ 1000 = 8.7 V, which is 2.2% of 400 V and inside the 20 V that BS 7671's 5% allows. Load the cable to its full 17.5 A and that 20 V is gone at 39 m. On a single-phase circuit the budget is only 11 V and the distance falls to 19 m at full load. Beyond those distances the next size up is not an upgrade, it is the correct cable.
All of it assumes the cable is clipped direct in open air at 30°C. A flexible cable still wound on its drum cannot shed heat and must be run out before it is loaded. Conduit, bundling and a Lahore roof in June each take another bite. 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 | 1.5 mm² × 4 cores |
| Strand construction | 30 / 0.25 mm per core (typical) |
| Max conductor resistance at 20°C | 13.3 Ω/km |
| Current capacity (method C, 3 loaded) | 17.5 A |
| Voltage drop | 29 mV/A/m |
| Voltage rating | 300/500 V |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor copper weight | ≈ 53.2 kg/km (4 × 13.3 kg/km per core) |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
Voltage drop is current × length × 29 mV/A/m ÷ 1000. A panel circuit drawing 10 A over a 25 m run drops 10 × 25 × 29 ÷ 1000 = 7.25 V, which is 1.8% of 400 V — comfortably inside the 5% BS 7671 allows on a power circuit, 20 V here. At the cable's full 17.5 A that same 20 V arrives at 20 000 ÷ (17.5 × 29) = 39 m. Past 39 m at full load the run length picks the size, not the current.
Flexible and standard are the same copper and the same 1.5 mm². Class 5 divides that area into 30 strands of 0.25 mm; class 2 uses 7 strands of 0.53 mm. Thin strands slide past one another when the cable bends, which is why a flexible core survives being coiled, dragged and wound onto a reel. A class 2 core flexed often enough work-hardens and breaks inside a sheath that still looks perfect from outside.
| Property | Class 5 (flexible) | Class 2 (standard) |
|---|---|---|
| Strands | 30/0.25 | 7/0.53 |
| Max resistance | 13.3 ohm/km | 12.1 ohm/km |
| Current capacity | 17.5 A / 19.5 A | 17.5 A / 19.5 A |
| Bends repeatedly | Yes | No |
| Typical use | Appliance tails, portable tools | Fixed wiring in conduit |
Buy the flexible build when the cable will actually move. For fixed wiring buried in a wall or pulled through conduit and never touched again, the class 2 build is the same copper for less, and at this size it is the standard house-wiring conductor — best wire for house wiring works through where 1.5 mm² belongs and where it does not.
Runs between panels, contactors, timers and small drives, where four separate wires would be four times the labour and four times the glanding.
Borewell and booster pumps drawing under 17.5 A per phase — three phases plus earth on one flexible tail from the starter.
Gear that is coiled, carried and re-rigged. Class 5 stranding takes that repeated bending; class 2 conductors harden and crack at the flex point.
Who buys this size: switchgear and panel shops, pump installers, and the event and workshop trade. The circuit it suits is a small three-phase one — a 400 V motor or panel feed under 17.5 A per phase — or a single-phase run that needs a spare core for a switch line or a pilot. For a fixed run inside conduit that never moves, the class 2 standard build costs less for the same copper and pulls in easier; class 5 earns its price only where the cable bends after installation. Above 17.5 A per phase, step up: 2.5mm 4 core flexible cable at 24 A is the next one we make, then 4mm 4 core flexible cable at 32 A.
Core count follows the circuit. Two core is line and neutral with a separate earth. 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 1.5 mm² in each; the rating changes only with how many conductors are loaded.
| Cores | What runs in it | Loaded | Current capacity |
|---|---|---|---|
| 2 core | Line and neutral, earth run separately | 2 | 19.5 A |
| 3 core | Line, neutral and earth — or three phases, no neutral | 2 or 3 | 19.5 A / 17.5 A |
| 4 core | Three phases plus neutral | 3 | 17.5 A |
The same size in the other builds: 1.5mm 2 core flexible cable and 1.5mm 3 core flexible cable. One step up in the same four-core flexible build is 2.5mm 4 core flexible cable at 24 A, then 4mm 4 core flexible cable at 32 A.
At this size a short coil is easy to miss, because the whole coil is light enough to carry in one hand. Three checks settle it, with a weighing scale, a tape and a vernier.
Conductor mass = area × cores × 8.89 kg/km per mm². For 1.5 mm² 4 core that is 1.5 × 4 × 8.89 = 53 kg/km, so a 90 m coil holds only about 4.8 kg of copper before insulation and sheath.
A class 5 core at this size is about 30 strands of 0.25 mm. Cut the end square and count them under good light. Fewer, thicker strands means a class 2 conductor 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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