There is at least one utility in Wisconsin that still offers 120/240V 3phase 4wire new services. We also can get 240V 3phase 3wire delta, if we want to.

Paul, you asked about other drawbacks on these wild-leg systems.

1) Utilities always have the high (orange) leg as phase C, while the NEC requires the facility to have the high leg as phase B. This means that the wiring is different on the load and line side of the service connection point.

2) Most of our 2 pole breakers are listed for a maximum voltage to ground of 120V, and so can fail violently if connected to the high leg. Non-standard 240V to ground breakers have to be used.

3) Load balancing can be a concern. Most (but not all) transformer banks are not sized to provide single phase (240V) connection with one connection being the high leg.