DIN EN 60027-7:2011 Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution (IEC 60027-7:2010); German version EN 60027-7:2010
2011DIN EN 60027-7:2011-02 Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution (IEC 60027-7:2010); German version EN 60027-7:2010 / Note: DIN 1304-3 (1989-03) remains valid alongside this standard until 2013-09-01.
2011DIN EN 60027-7:2011 Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution (IEC 60027-7:2010); German version EN 60027-7:2010
1989DIN 1304-3:1989 Letter symbols for physical quantities; symbols to be used for electric power systems