http://www.passandseymour.com/pdf/U029.pdf will show you HD 240v devices
The power cord you have can be used for 240v because each conductor will be carrying half of what the hot conductor did when you were using the cord for 115v. Change the plug to the appropriate 240v and you're done.
You don't need a dryer cord. Your local hardware store has plugs for 220 volts, used for some large window air conditioners and shop tools. The plug looks just like a 3-prong 110 volt plug except the power prongs are turned 90 degrees.
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