61857-21-1998 Electrical Insulation Systems - Procedures for Thermal Evaluation - Part 21: Specific Requirements for General-Purpose Model - Wire-Wound Applications (Edition 1.0)
Systemes D'Isolation Electrique - Procedures D'Evaluation Thermique - Partie 21: Exigences Particulieres Pour Le Modele D'Usage General - Applications Aux Enroulements A Fil (Edition 1.0)
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