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Four Wire Delta Circuits Continental Control Systems Llc  Technically 1/8V describes a single phase 3wire system of 2 hots and a neutral, while 8Y/1 describes a 4wire system This is per ANSI/IEEE standards where single phase systems are listed as LV/HV and three phase systems are HV/LV See Informational Note after NEC definition of Voltage, NominalThe laws of physics do not require it Code normally requires that the Neutral is bonded to the copper ground, and in turn, the copper ground is bonded to dirt By default a 1v/8V system must be 3phase The 1/8 ratio points to 3phase, and the dual voltages point to 4 wires IOW, 1V/8V implies 3Ph/4wire 120/208 three phase wiring