Conduit is best, especially when exposed, and the breaker should be sized to protect the wire. The compressor itself generally has its own motor protection. The compressor should have a recommended circuit amp size on the name plate. In your case a 30 amp (dual) circuit breaker with 10 gauge wire would likely be the best way to go. Avoid romex. Hardwired with a disconnect is best for permanent installations, but if its more convenient there is nothing wrong with an appropriate receptacle.
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