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	Subject - 230 volt tbt22 Hey guys, Can anyone tell me why I dont need a neutral on a Air Conditioner motor 230 v single phase? If its alternating current how does it alternate without a common?Through the ground? Thanks boccinono No, it does not alternate through the ground or the neutral. Both those Phases are alternating at a phase angle of 90 degrees, plus or minus. Voltage is a difference of potential. To answer your question each phase is alternating between phases. Scott Vickrey Have a look at this post, I think it will help you understand. http://www.electricalknowledge.com/forum/topic.asp?TOPIC_ID=56&SearchTerms=220,volt