Frequency is the part people forget
Buyers think about voltage because the plug is visible and the voltage is printed on the wall. Frequency is less obvious and considerably more consequential. A cabinet built for 50 Hz and connected to a 60 Hz supply does not simply work a little differently — its compressor runs about twenty per cent faster, and everything downstream of that changes.
On a synchronous-speed compressor the mass flow rises, which raises refrigeration capacity but also raises power draw and motor current. On some designs the compressor is fine with this. On others it is operating outside the envelope it was rated for, which is a warranty conversation waiting to happen.
- Evaporator and condensing fans also change speed with frequency, altering airflow and the air curtain
- Hermetic motors are designed around a specific speed range, not a specific voltage alone
- A 60 Hz cabinet on a 50 Hz supply loses capacity instead, which shows up as a cabinet that cannot hold temperature in summer
State both, always
- Voltage and frequency together, on the purchase order: 220 V / 50 Hz, 230 V / 50 Hz, 115 V / 60 Hz
- Never infer the frequency from the destination country — Japan runs both, and parts of the Middle East and Latin America are mixed
- Confirm the compressor model is available and rated for that frequency
- Confirm the rating applies to the fans and the controller too, not only the compressor
Why a universal cabinet costs more
It is technically possible to build a dual-voltage or dual-frequency cabinet, and for some export programmes it is the right answer. The usual approach is a 50/60 Hz rated compressor with an inverter drive, or a system that switches the compressor and fan programming according to the incoming supply.
The cost is real: a different compressor, a more capable controller, and a cabinet that has to be tested across a range of conditions rather than at one point. It is worth paying when you genuinely do not know which market a unit will be sold into, or when you are supplying a distributor who holds stock across several countries.
It is not worth paying when you know the destination. A single-frequency cabinet built for the right market is cheaper, simpler and, in our experience, more reliable, because it has been optimised rather than compromised.
Plugs, cables and what actually arrives on site
| Market | Supply | Plug / connector | Notes |
|---|---|---|---|
| Continental Europe | 220 - 240 V / 50 Hz | Schuko CEE 7/7 | UK and Ireland are different |
| United Kingdom, Ireland | 230 V / 50 Hz | Type G, fused | Fuse rating must suit the unit |
| North America | 115 V / 60 Hz | NEMA 5-15P or 5-20P | Higher current, heavier cable |
| Australia, New Zealand | 230 V / 50 Hz | Type I, insulated pins | Insulated pin requirement is mandatory |
| Middle East | 230 V or 400 V / 50 Hz | Type G or CEE | Varies by country and by building |
| Japan | 100 V / 50 or 60 Hz | Type A | Two frequencies, region by region |
Two practical details are worth agreeing early. The first is cable length and where it exits the cabinet — a cable that exits at the wrong corner can make a built-in installation impossible. The second is whether the customer wants a plug fitted at all, since some markets require the plug to be installed locally by a qualified person.
Protection, earthing and site reality
A cabinet is only as good as the supply it is connected to. In markets where the supply is variable, the electrical specification should include protection the cabinet would not need in Europe.
- Confirm the earthing arrangement on site, and that the cabinet is earthed to it properly
- Where the supply is unstable, specify a voltage protection relay or AVR
- Confirm the circuit is dedicated and correctly rated; a shared circuit is a common cause of nuisance trips
- In humid or coastal sites, ask for a higher ingress protection rating on the electrical enclosure
The majority of electrical warranty claims we see are not component failures. They are cabinets connected to a supply that was never measured.
How to write it on the order
One line on the purchase order removes almost all of this risk. It should read something like: 220 V, 50 Hz, Schuko plug fitted, 2 m cable, cable exit at the lower right, IP44 electrical enclosure.
If you are not certain of the destination, say so and we will quote both the single-frequency and the universal option, with the price difference stated separately. That is a much cheaper conversation than discovering the problem after the container lands.
Liang leads the refrigeration test bench at Dixue and has spent nineteen years matching compressors to cabinets.
