This question is most probably asked and answered several times on this forum but in the search I could not find exact question/answer, so I am posting this. Thanks for understanding....
I have a 1-ph xfmr with primary 480V (fed from two phases of a 480V MCC) transformed to 1ph 120V on the secondary. There is no neutral terminal. There is only one ground terminal.
I have a 1-ph distribution panel on the secondary side with main breaker and 42 fdr ckts. There is also a neutral bus and ground bus terminals on this panel. But we call it 120V, 1ph, 2 wire panel. We intend to use this xfmr-panel distribution circuit for building receptacles, lighting etc.
Question: What should be the connection between xfmr and distr. pnl? Should it be a simple L1-L1, L2-L2 and ground to ground and leave the neutral unused? I will also run ground wire from MCC to xfmr for continuity. The 42 fdr ckts then will feed L1-L1, L2-L2, grnd-grnd for each receptacle and lighting circuit and other aux. power circuits. Is this correct?
My concern is about the return path in the circuit when the secondary side of xfmr has no neutral (like in 120/240V case) Should one of the legs on xfmr secondary, let's say L2 to be grounded? then that will groun one of the phases on panel as well.
Please some one educate me. Thanks for your help!!!