It doesn't need to be converted. The 240 Volt single-phase electricity is there already to operate any single phase devices. New breakers, the right size of wiring and a new wall outlet are what have to be installed to add a new single phase 240 Volt circuit to an existing breaker panel which already has a three-phase supply. For safety reasons only a trained and licensed electrician should work with this equipment. <><><> Careful! The statement above can be misleading. The Asker is obviously not from the US, he thinks US 240V is three phase, when its really single-phase. But note that he wants to convert to single-phase with one hot and one neutral. This is consistent with European standards with 230V single-phase where one wire is hot and one wire is cold (neutral). You cannot connect a European 230V appliance directly to US 240V because this would connect a hot wire to the appliance's grounded connection, potentially making the chassis components hot! So, while it is true nothing needs to be done to convert US 240V service to single-phase (because it already is), it is not correct to imply that US 240V can be used where you want 240 volts with one hot and one neutral. This would require an isolation transformer or other approved international voltage converter. For more information see the answer to the Related Question Can you plug a 230V 50Hz appliance into a 240V 60Hz outlet? shown below <><><>
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.
If you do this work yourself, always turn off the power
at the breaker box/fuse panel BEFORE you attempt to do any work AND
always use an electrician's test meter having metal-tipped probes
(not a simple proximity voltage indicator)
to insure 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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