Am installing a delta/wye transformer (back fed, but approved by the manufacturer). Primary = 120/208V WYE from the utility service disconnect; Secondary = 480V Delta; 112.5kVA unit;
Question: Manufacturer says "do not connect X0 to ground / grounded conductor when back feeding"(Using as step up instead of step down); Which phase should be grounded on the secondary(high side - 480v)? I think "C" phase. Comments?
Question: Manufacturer says "do not connect X0 to ground / grounded conductor when back feeding"(Using as step up instead of step down); Which phase should be grounded on the secondary(high side - 480v)? I think "C" phase. Comments?