IEC 81346-2:2019 establishes classification schemes with defined object classes and their associated letter codes, and is primarily intended for use in reference designations and for designation of generic types._x000D_
The classification schemes are applicable for objects in all technical disciplines and all branches of industry._x000D_
IEC 81346-2:2019 is a horizontal publication also intended for for use by technical committees in preparation of publications related to reference designations in accordance with the principles laid down in IEC Guide 108._x000D_
IEC 81346-2:2019 cancels and replaces the first edition published in 2009. This edition constitutes a technical revision._x000D_
This edition includes the following significant technical changes with respect to the previous edition:_x000D_
a) The entry classes of the classification scheme have been defined to reflect the “inherent function” of the object classified;_x000D_
b) The classes are defined to align with the principles of ISO 22274 and ISO 704;_x000D_
c) A three-level classification scheme has been defined, which provides a greater flexibility for the designer in some technical fields;_x000D_
d) Classes are defined by their definition and provided with a preferred term. Examples are provided if needed;_x000D_
e) A separate classification scheme for spaces has been provided.
