the only time I have ever seen anything like that is on a billboard sign, what I have seen on the line side is, the grounded conductor is landed like normal, and the "A" phase is stripped in the middle and landed on the "A" phase terminal, but leaving an insulated tail long enough to loop over to the "B" phase termial, feeding both halves of the meter with a single phase, the bottom of the meter is wired like normal, everything fed from it is 120 volt on the same phase, so you read 120v to ground, and 0v phase to phase. just make sure whatever your feeding doesnt overload your grounded conductor, billboards have a minimal load, so it isnt a problem in that application....