I ran into a very odd transformer setup in our plant last week and wanted to run by everyone here as it looks totally wrong . they have a 480v three phase cnc machine fed by a 480-208 v transformer ran backwards . everything seems to work ok but the machine ground is ran to the transformer cabinet ground and then back to the panel . how should this be done ? the transformer is a 480 delta to 240 Y ran in reverse . one of the electricians says we should ground the neutral and another says we should ground any of the conductors on the secondary .