IEC 60034-7:2020 gives two systems of classification: an alpha-numeric designation applicable to machines with endshield bearings and only one shaft extension (code I) and an all-numeric designation applicable to a wide range of types of machines (code II) including types covered by code I.
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IEC 60034-7 Ed. 3.0 b:2020
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Rotating electrical machines – Part 7: Classification of types of construction, mounting arrangements and terminal box position (IM Code)
International Electrotechnical Commission , 10/07/2020
Pages: 49
