Single-phase 220V motors can safely operate on 208V or 240V power, with a typical voltage tolerance of ±10%. Motors draw slightly different current at these voltages but remain unharmed if circuits are properly rated. This does not apply to three-phase machines, which require exact voltage matching. No transformer is needed for using 208V or 240V with 220V motors.
Yes. All of our single-phase 220V motors will operate on either a 208V or 240V nominal power supply. These are the most common voltages available in North America once you move up from 110V (or 120V).
What Does “Nominal Voltage” Mean?
“Nominal” voltage is a standardized number used by power companies to describe the type of voltage supplied to your building.
- Actual voltage at your location will typically vary by ±5% of the nominal value.
- Motor manufacturers design motors to operate within ±10% of the voltage marked on the motor label.
What Does That Mean for My Machine?
A motor labeled 220V will run safely on any actual voltage between 198V and 242V.
So whether your supply is 208V, 220V, or 240V, your machine will work properly.
Will There Be Any Performance Difference?
- At 208V, the motor may draw slightly more current to produce the same power. This is normal and within design limits.
- At 240V, the motor may draw slightly less current.
Neither case will harm the motor as long as the circuit and breaker are sized correctly.
Important Tips
- Check your machine’s label to confirm it is single-phase and rated for 220V.
- Ensure your circuit breaker and wiring are rated for the motor’s amperage at the voltage you’re using.
- If you’re unsure, consult a qualified electrician.
What About Three-Phase Machines?
This guidance applies to single-phase motors only. Three-phase machines have different requirements and should match the supply voltage exactly.
FAQ
Q: Can I use 230V with a 220V machine?
A: Yes. 230V falls within the acceptable range for a 220V motor.
Q: What happens if my voltage is outside the range (198V–242V)?
A: Operating outside this range can cause overheating, reduced performance, or motor damage. If your voltage is consistently too low or too high, consult an electrician.
Q: Do I need a transformer to run my machine on 208V or 240V?
A: No. Our single-phase 220V motors are designed to work on both 208V and 240V without a transformer.
Summary
If your machine is labeled for 220V single-phase, you can safely use it on 208V or 240V power. This flexibility makes installation easier and ensures compatibility with common North American electrical systems.