I have an old building that is getting its power from an open delta utility company transformer. This is giving us 240v 3-phase power. I have been doing some research on this subject and have not come up with a lot of information, what I am wondering is the following. Do I need to avoid putting single phase power on the 'C' phase due to it being a "stinger" leg that has a different voltage? if so what is this voltage? how do I do my load calculations on this panelboard? there isn't a relationship with the square root of 3 for me to work with so I am not sure how to input the 3-phase power.....any advice or points in the right direction would be extremely helpful.
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