Join Date: Apr 2009
Location: Blue Ridge
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You can make your own pigtail for the 220V. Because of the many differrent pin configurations of the twist lock, you will need to know exactly which socket you are dealing with. The configuration numbers are printed on the socket/plug. I'm sure somewhere in Japan is an electrical supplier.
Unless you are dealing with three phase power (highly unlikely, but check), the fourth pin is neutral, so no need to connect for your application.