Most import problems with commercial ovens are not mechanical. They are electrical: the unit arrives, the element rating is higher than the circuit the kitchen actually has, and the only options left are an expensive supply upgrade or a machine that never runs at temperature.
The good news is that the decision can be made on a single calculation before anything is ordered.
Convert wattage into current first
Breakers, cables and sockets are rated in amperes, not kilowatts. For a resistive load the conversion is direct:
I = P / V (current = power / voltage)
Applied to the three element ratings in this range at a nominal 230 V:
| Element rating | Current at 220 V | Current at 230 V | Current at 240 V |
|---|---|---|---|
| 2.5 kW | approx. 11.4 A | approx. 10.9 A | approx. 10.4 A |
| 4.5 kW | approx. 20.5 A | approx. 19.6 A | approx. 18.8 A |
| 6 kW | approx. 27.3 A | approx. 26.1 A | approx. 25.0 A |
Note the direction of travel: the same element draws more current at a lower voltage. A 6 kW oven on a 220 V supply is a harder load on the circuit than the same oven on 240 V. That is exactly why the supply figures have to be settled before the model is fixed.
Size the circuit with headroom, not at the limit
An oven is a continuous load, not a momentary one. Electrical practice in most markets expects the protective device and cable to be selected above the running current, not at it. In practice that means a 2.5 kW unit usually sits comfortably on a 16 A circuit, a 4.5 kW unit needs to be looked at on a 25 A or 32 A basis, and a 6 kW unit generally points toward a dedicated 32 A circuit. Local wiring regulations always take precedence over any general figure, and the final connection must be signed off by a qualified electrician on site.
220-240 V is not the same as 208 V
Sites in North America frequently present 208 V rather than 230 V, and 60 Hz rather than 50 Hz. Re-run the calculation at the real site voltage: a 6 kW element at 208 V draws roughly 28.8 A, and that changes the breaker requirement. Frequency matters too, because it affects motor-driven components if the model has them.
This is the single most useful piece of information you can send with an enquiry: the measured site voltage and frequency, the available breaker rating, and whether the supply is single-phase or three-phase.
Higher power is not automatically better
Element rating decides recovery speed: how quickly a chamber returns to set temperature after the door has been opened. For a bakery running back-to-back loads, that recovery is what protects the bake. For a restaurant producing two trays at service time, a smaller element on a circuit the building already has will outperform a larger element the building cannot feed.
Our range is deliberately spread across three ratings for that reason: the 2.5 kW double deck, the 4.5 kW four-tray oven rated 220-240 V, and the 6 kW four-tray oven.
What to send with an enquiry
- Measured site voltage and frequency
- Available breaker rating and cable size
- Single-phase or three-phase supply
- Distance from the distribution board to the oven position
- Any requirement for a specific plug, isolator or termination type
With those five items, utility configuration can be confirmed on the quotation instead of discovered on installation day. Send them through the request a quote form and we will match the element rating to your supply.
