It has the status of a horizontal standard in accordance with IEC Guide 108.
IEC 60050-421 Ed. 1.0 t:1990
$139.00
International Electrotechnical Vocabulary (IEV) – Part 421: Power transformers and reactors
Category: IEC
$139.00
International Electrotechnical Vocabulary (IEV) – Part 421: Power transformers and reactors