I've encountered a service to a college campus which is a 34.5kV overhead service derived from a utility owned delta wye transformer but from which neither a neutral nor a ground has been run. They simply come into the campus with 3 cables. Is this common? Is this safe? In the event that there is a ground fault, how is the fault cleared? Does the high voltage allow for sufficient current to flow through the earth back to it's source? How does one deal with such a system from an overcurrent protection and surge arresters standpoint?