This part of IEC 60034 specifies the IM code, a classification of types of construction, mounting arrangement and the terminal box position of rotating electrical machines. 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. This part of IEC 60034 specifies the IM code, a classification of types of construction, mounting arrangement and the terminal box position of rotating electrical machines.