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Amazon Com Leviton 421 Dy3 1 8 Voltios 3 Fases Wye 2v 3 Phase Protector De Panel Delta De 4 Modos De Proteccion Compatible Con Los Controles Decora Home Herramientas Y Mejoras Del Hogar  The fact that the transformer is a wye is of no consequence The voltage across any coil will not exceed 8, and the voltage from any point in any coil will not exceed 1 to ground Think of a wye wound 3ø motor The center of the wye is isolated from ground, just as it should be with a wye wound transformer I got a call from an electrician and building owner who had already started work to convert an existing 240/1 volt, threephase delta service to 1/8volt wye The power company wanted to get rid of the old transformers and service and provide a new pad mounted transformer for the building 120/208 wye or delta