A single phase 120 volt device needs a neutral line, a hot line and a
ground, where as a 220 volt device only needs two hot lines and a ground in
most cases. So the questions is did the electrician pull a neutral wire with
your original 220 volts? You will need to replace the receptical and wire
accordingly if you are going to try to plug in a 120 volt device. If you are
going to use say a 20 amp 220 device on your existing 30/50 amp receptical
you could have an adapter cord made up with the proper plugs and receptical
and use your existing receptical.
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