Winnie i believe you missed part of marc's first post
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this part i am kinda relecut to do this, because i did look up the Pass and Seymour catalog book and have footnote for hp rating for 6-30R and the 6-30P they are restricted to 2 hp only and i will like your options here.
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Many receptacles have a HP limit in the manufacturers instructions.
You could still cord and plug connect the compressor but the cost will be high. The only real reason to do that is if the customer will be moving the compressor from place to place. Not in the case described.
