Historical
IEC 61346-2 Ed. 1.0 b:2000
Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 2: Classification of objects and codes for classe
Defines object classes and associated letter codes for these classes to be used in reference designations. Applicable in all technical areas and may be applied at any position in a tree-like structure set up in accordance with IEC 61346-1
International Electrotechnical Commission [iec]