Hi all, I have a Campbell Hausfeld 60 gallon, 5 HP, 230 volt, 15 amp air compressor, and the wiring diagram on the electric motor (see attached photo) shows two methods of wiring (115v or 230v). I'm going to hard wire it to a junction box with an on/off switch. My question is which method should I use (115v or 230v)? The electrical circuit that the compressor will be tied into at the very end, has a 30 amp breaker with white romex. In fact, the entire house uses white romex, which is a little troubling to me because in my mind yellow would be the minimum for the house, and orange or black would be the most appropriate minimum for a garage where you would likely have many lights and power tools, etc.. Anyway, I'd like to know which method of wiring would be best for the compressor to work most effeciently, and how my electric bill be affected by each method (in other words, would wiring the compressor up using 230v be best for the compressor but higher electric bill, or would both be noticeably identical)? Thanks

My 200amp panel is pretty full so I started mapping all the circuits since I suspected that there are abandoned circuits or circuits with very small loads on them. I am used to finding dryers on 30amp double pole breakers but it looks like mine is on a 30amp single pole breaker which doesnt make sense to me since it needs 240v. Attaching a photo of the breaker & panel. The dryer is setup on the one marked (4). Just for reference, I didnt find anything on (2) and my cooktop is setup on 6 & 8 (2x 30 amp single breakers; it turns off if either is flipped) I just bought the house a few months back and am looking to free up some space for a finished basement. A few circuits are setup to control 1 or 2 outlets or <4 lights. I checked the dryer outlet and it does have 2 120v legs which seem ok and the unit works great. Let me know what you think.