مصدر وحيد القطبية +PEN Wechselstrom + PEN Однополюсный + PEN Single-pole source +PEN Sorgente unipolare + PEN Source unipolaire + PEN Linia jednofazowa (TN-C) Fuente unipolo + PEN 1 fáze + PEN 1 fase + aardenul Μονοφασικό +PEN Author: The QElectroTech team License: see http://qelectrotech.org/wiki/doc/elements_license