I have seen a three phase corner grounded delta service which is both three phase three wire 120 volt and simultaneously a three phase three wire 240 volt service. the way it is done is three pole mounted tubs are wired delta and the b-phase is grounded. This makes the 240 delta service with the corner grounded
Also two of the tubs have the center tap brought out and connected as phase conductors along with the grounded b-phase. This panel is then a 120 delta service although only used as 120 single phase load center. Is this a code violation?
Also two of the tubs have the center tap brought out and connected as phase conductors along with the grounded b-phase. This panel is then a 120 delta service although only used as 120 single phase load center. Is this a code violation?