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Answer for USA, Canada and countries running a 60 Hz supply service.

To answer the first part of the question. No you can not convert 120 volts single phase into 208 volts 3 phase. In fact it is the other way around, the 120 volts is the line to ground (neutral) of a three phase 208 volt system.

The second part of the question is dependant on there being a three phase 208 volt system already installed. To obtain 40 amps per phase would require a three pole breaker to be installed in a 120/208 three phase distribution panel.

The distribution panel would most likely be in the 100 to 200 amp capacity range. This kind of installation would definitely have to be installed by an electrical contractor as inspections and permits would have to be taken out for the project.

As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

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Q: Can you convert 120 volts 1 phase into 208 volts 3 phase 40 amps per phase and would it be cheaper to get 208 volts 40 amps per phase installed in your house by electrician?
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