Can you convert 240 volt to 208 volt?

Answer 1

I'm sure you could, but it wouldn't be practical. The reason for this is because 208 volts between two phases comes from a three phase transformer, while 240 volts phase to phase comes from a single phase, center tapped transformer. If you're asking regarding a resistive load, such as a heater, the load should work with 240 volts or 208 volts. There will be a slight difference in performance, but it shouldn't be very noticeable. If you're asking because you have a motor load rated for 208v, you'll likely see that the motor requires three phase 208 volt power and you only have 'two phase' 240v power. You can however supply a three phase equipment or motor with a device called a phase converter.

Answer 2

Yes. In fact 110V with low wattage can also be converted to 240V. If the voltage is AC, the easiest method is to use a step up transformer with the proper VA rating for the power you need to supply. 110V @ 20A = 2200VA or 2.2KVA. This means that the transformer output for 240V can supply about 9A to a load (2200 / 240) If the voltage is DC then you need to use a DC to DC conversion. There are different ways to do this. Voltage doubling circuits, inverter to powersupply combinations and even DC motor to DC Generator will convert the voltage.