Naval ships use floating delta exclusively- even for single-phase circuits, both wires are "hot" legs of a 110/63V Delta.
Where does the 63V come from if the supply is a true delta configuration and there is no other ground reference on the system?
We use a 110Y/63V system on large building sites in the U.K. for the handheld 110V power tools. The secondary is wye though, and the neutral point is always grounded, thus limiting the potential on any hot leg to 63V with respect to ground.
