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36 A, 7/0.85 class 2 copper, 450/750 V. The size that goes to an AC point or a socket submain, PVC insulated and sheathed, drawn on the Pilone line in Lahore.
Quoted per metre at the day's copper rate. Send the length in metres and your city for the coil figure.
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.
36 A — the size for a 1.5 ton AC point or a socket submain.
4mm² 2 core standard cable carries 36 A with both conductors loaded, clipped direct at 30°C, which leaves real margin over the 7–9 A a 1.5 ton air conditioner draws and over the 20 A MCB that protects it. Line and neutral only, so the earth arrives separately. The rate is quoted per metre at the day's copper price, and the coil figure follows from the length you need.
4mm² 2 core standard cable is rated 36 A with two loaded conductors on BS 7671 reference method C (clipped direct) at 30°C ambient. Its conductors are class 2 stranded copper, seven strands of 0.85 mm each, resistance capped at 4.61 Ω/km by IEC 60228, voltage drop 11 mV per amp per metre. In the bazaar the same size is called 7/.036, an imperial strand code that computes to 4.60 mm². Derate the 36 A for conduit, grouping and ambient above 30°C, and have a licensed electrician confirm the size for the run.
| Property | Value |
|---|---|
| Conductor | Plain annealed copper, class 2 stranded |
| Nominal area | 4 mm² × 2 cores |
| Strand construction | 7 / 0.85 mm per core |
| Market strand code | 7/.036 (computes to 4.60 mm²) |
| Max conductor resistance at 20°C | 4.61 Ω/km |
| Current capacity (method C, 2 loaded) | 36 A |
| Voltage drop | 11 mV/A/m |
| Voltage rating | 450/750 V |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor copper weight | 71.2 kg/km (2 × 35.6 kg/km) |
| Copper in a 90 m coil | 6.4 kg |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
Worked at a real run: a 1.5 ton AC drawing 8 A over 25 m of 4mm² drops 8 × 25 × 11 ÷ 1000 = 2.2 V, against the 11 V that BS 7671's 5% allowance gives on a 220 V supply. Even a 30 A socket submain over 30 m only drops 30 × 30 × 11 ÷ 1000 = 9.9 V — inside the limit, but close enough that the next size up is worth pricing. Check yours in the voltage drop calculator.
A price without a unit tells you nothing, and this market prints plenty of them. Per foot and per metre differ by a factor of 3.281. Coil is not a fixed quantity either: 30 m, 45 m and 90 m packs are all sold, some sellers quote 301 ft, and 80-yard lengths exist. Get the length in metres in writing, then divide.
| Pack | Length | In feet | Copper inside |
|---|---|---|---|
| Cut length | 1 m | 3.281 ft | 0.07 kg |
| Half coil | 45 m | 148 ft | 3.2 kg |
| Full coil | 90 m | 295 ft | 6.4 kg |
| 301 ft coil | 91.7 m | 301 ft | 6.5 kg |
The copper column is a check anyone can run. Copper weighs 8.89 kg per km for every mm², so 4 mm² across two cores is 8 × 8.89 = 71.2 kg per km, and a 90 m coil holds 6.4 kg of bare conductor. PVC and the drum add weight on top, so a real coil weighs more; it should never weigh less. More unit arithmetic on the price per metre page.
A dedicated run to a 1.5 ton AC on a 20 A MCB, or to a storage geyser on a 25 A MCB.
Main panel to a sub-board serving kitchen or bedroom sockets in a 3 or 5 marla house.
Long lighting runs where 2.5mm² would pass on current but fail on voltage drop.
Most buyers reach this size from a job, not a number. Three of the common ones, with the current each draws on a 220 V single-phase supply. Always confirm against the rating plate on your own unit.
Typically 1500–1800 W, on a dedicated 20 A MCB. The compressor start pulls two to three times the running current.
Typically 1500–3000 W depending on the element, on a 25 A MCB with its own earth.
A sub-board feed carrying several socket circuits, kept under the 36 A the cable is rated for.
| Cable | Current | Where it goes |
|---|---|---|
| 4mm 2 core standard cable (this page) | 36 A | Line and neutral, earth taken separately |
| 4mm 3 core standard cable | 36 A | Same run with its own earth core |
| 4mm 4 core standard cable | 32 A | Light three-phase runs at 400 V |
| 6mm 2 core standard cable | 46 A | One size up: long runs and heavier submains |
| 4mm 2 core flexible cable | 36 A | Class 5, for cable that moves or bends |
| 4mm (7/.036) single core wire | 36 A | One conductor per sheath, pulled through conduit |
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