IEC 81346-2:2009 pdfダウンロード。Industrial systems , installations and equipment and industrial products – Structuring principles and reference designations – Part 2: Classification of objects and codes for classes 1 Scope This part of 1 nternational Standard 81 346 , published jointly by 1 EC and 1 SO defines classes and subclasses of objects based on a purpose- or task-related view of the objects , together with their associated letter codes to be used in reference designations. The classification is applicable for objects in all technical areas , e.g. electrical , mechanical and civil engineering as well as all branches of industry...