IEC 81346-2:2009 pdf download – Industrial systems, installations and equipment and industrial products – Structuring principles and reference designations – Part 2: Classification of objects and codes for classes

This part of International Standard 81 346, published collaboratively by the IEC and ISO, defines categories and subcategories of objects based on their intended purposes or functional roles. It also provides the relevant letter codes to be used in reference designations for these objects. This classification system applies to objects within all technical fields, including electrical, mechanical, and civil engineering, as well as various industrial sectors such as energy, the chemical industry, construction technology, shipbuilding, and marine engineering. It can be utilized by all technical disciplines at any phase of the design process.