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Okay great - just so you know, I had the shop wired single phase, not 3-phase 250V circuits.

Thank you all for your replies. I was thinking I could still use the L14-30 plug and receptacle by using the 2 hot leads (brass screws) in the plug and the ground (not use the silver screw connection...

New compressor is 240v, 20amp, 3 wire (white, black, ground). Existing 250 volt outlet & plug are L14-30, 30amp, 4 connectors (2 hots, neutral, and ground). How do I wire the plug? If I have to...