مصدر ثلاثي القطبيّة + PEN Drehstrom + PEN Трёхполюсный + PEN Three-pole source + PEN Sorgente tripolare + PEN Source tripolaire + PEN Linia trójfazowa (PEN) Fuente tripolar + PEN 3 fáze + PEN driefasen + aardenul Τριφασικό + PEN Author: The QElectroTech team License: see http://qelectrotech.org/wiki/doc/elements_license