Abstract: A transformer comprising a stack of sheet metal laminations; an insulating plastic bobbin on which a primary coil is wound; an insulating plastic bobbin on which the secondary coil is wound; and two interengaging insulating plastic covers which enclose the primary coil and provide additional insulation between the primary coil and the laminations and between the primary and secondary coils, while also providing a strain relief for the primary leads from the primary coil. The plastic components are formed to provide two mms of insulation between the primary and secondary coils, and between the primary coil and the laminations. The plastic components are arranged to provide at least 10 mms of "creepage" distance between primary and secondary coils and at least 8mms between the primary coil and the laminations. The insulation provided is sufficient to permit the steel laminations to be mounted directly on the metal frame of an appliance.