120/240 v single phase panel

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GoldDigger

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You can not directly run a three phase load from it, though as I earlier mentioned you can derive an open delta system from it from which you can directly run a three phase load.

You might be able to connect a three phase motor to both lines and to the neutral and it might run, but you have horrible voltage balance and it probably destroys that motor in no time, unless you do some transformation before connecting to the three phase motor.
That really depends on the voltage you need. The two ungrounded conductors from the 208Y/120 system combined with the neutral form a perfectly good corner grounded 120V delta. It is, as you note, an open delta though.

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