I am currently wiring a 208-240volt air compressor. On the motor where the horsepower should be is the acronym spl. The motor also says just simply 15amps. On the front of the tank in big letters is: 3.5 running horse power. The Unit came with a 250volt twist lock cord end. a. How do I size the O.C protection and conductors for this air compressor if there is no horse power given?B. Is a twist lock cord sufficent as a disconnect. The motor is thermally protected and there is an on off on the presser switch.