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Electrical insulation systems - Procedures for thermal evaluation - Part 21: Specific requirements for general purpose models - Wire-wound applications (IEC 61857-21:2004); German version EN 61857-21:2004
German title
Elektrische Isoliersysteme - Verfahren zur thermischen Bewertung - Teil 21: Spezielle Bedingungen für Mehrzweckmodelle - Anwendungen bei Drahtwicklungen (IEC 61857-21:2004); Deutsche Fassung EN 61857-21:2004
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