IEC 60034-6-1991 Rotating electrical machines - Part 6: Methods of cooling (IC Code)

Language: English, FrenchThis part of International Standard IEC 34 has been prepared by Sub-committee 2H: Degrees of protection, methods of cooling and mounting arrangements, of IEC Technical Committee No. 2: Rotating machinery.
It constitutes the second edition of IEC 34-6 and replaces the first edition, issued in 1969.Scope
In this edition of IEC 34-6, the sequence of numerals and letters following the Code letters IC is changed.
This edition also provides for the designation to be simplified, where possible, by the omission of the letter A and of the numeral 7 for movement of secondary coolant under certain conditions.
In addition, new letters F, S, X and Y are provided and defined; the previous letter E, indicating cooling by evaporation of a liquid, has been omitted.
With the introduction of the new designation system, clarifications are required to definitions of open and closed circuit cooling and of dependent and independent components (see clause 2).
The mode of connecting the supply and the delivery of the appropriate control equipment for circulation components, which were specified in the first edition are no longer taken into account in this second edition.
Where the two systems differ, they can be distinguished both in the complete and the simplified code.
Examples of cooling according to the first and the second editions are compared in annex B.