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4 mm² copper on a heavier single-phase cabinet at 220 V. On a 400 V three-phase unit, 4 mm² four-core.
This is the one appliance here where a chart cannot hand you the number. Display chillers, glass-door cabinets, walk-ins and condensing units run anything from a domestic-sized compressor to a three-phase machine, and the figure that sizes the cable is the full-load current on the plate. Find that first. 4 mm² is where most single cabinets land: 36 A on two loaded conductors, 32 A on three, clipped direct at 30 °C.
For a commercial freezer the cable is sized from the full-load current on the unit's rating plate, not from a wattage band, because the same words cover machines an order of magnitude apart: a 220 V single-phase glass-door cabinet and a 400 V three-phase condensing unit are both called a commercial freezer. Two things on the plate settle everything else — the supply voltage and phase count, which fix the core count, and the FLA, which fixes the size.
| What the plate says | Cores you need | Cable | Capacity |
|---|---|---|---|
| 220–240 V, 1 phase, FLA up to 16 A | 3 core | 2.5 mm² (7/.029) | 27 A |
| 220–240 V, 1 phase, FLA 16–25 A | 3 core | 4 mm² (7/.036) | 36 A |
| 380–415 V, 3 phase, FLA up to 25 A | 4 core | 4 mm² (7/.036) | 32 A |
| 380–415 V, 3 phase, FLA 25–35 A | 4 core | 6 mm² (7/.044) | 41 A |
| 380–415 V, 3 phase, FLA 35–50 A | 4 core | 10 mm² (7/.052) | 57 A |
Take a glass-door display freezer with 1200 W on the plate, 220 V single phase: 1200 ÷ 220 = 5.5 A running, and the plate's FLA will read higher, because the compressor's locked-rotor current is what the protection has to ride out. On its own 16 A way in 2.5 mm² that cabinet is inside every number. Now put three of them along one wall on one 16 A way, which is what happens when a shop grows a cabinet at a time: 3 × 5.5 = 16.5 A, over the breaker before a door has been opened.
Each cabinet is small; the row of them is not. What gives out is the shop's submain, not the freezer's tail, and the fix is a way each at the board and a submain sized for the total — the arithmetic in the commercial load calculation guide. Run 4 mm² where the cabinet is heavier than a domestic unit, where the board sits at the front of the shop and the freezer at the back, or where a bigger machine may replace it later. Where the plate says three phase, the run becomes four-core and the three-phase cable size rules take over.
Single-phase cabinet, three core so the earth matches: 4mm 3 core flexible cable for a tail behind the machine, or 4mm 3 core standard cable for a fixed run in conduit. Three-phase unit, four core: 4mm 4 core cable price, stepping up to 6mm 4 core cable where the plate's FLA passes 25 A.
Class 5 flexible copper, 56/0.30 strands, PVC insulated and sheathed, drawn on the Pilone line in Lahore. Rated 36 A on two loaded conductors and 32 A on three, clipped direct at 30 °C.
Cable is priced off the day's copper rate, so we quote per metre and per coil on WhatsApp. Send the size, the core count, the metres and your city.
We draw the copper in Lahore and sell it at the day's rate — no dealer margin. Send the plate's FLA, the core count, the run length and your city: Punjab in 1–2 days, rest of Pakistan in 2–4.