It is critical to note that is no longer the active standard. It was withdrawn and replaced by IEC 81346-1 , which was most recently updated in 2022 . The shift to the "80000" series reflects a joint collaboration between the IEC and ISO to create a unified horizontal standard applicable across all engineering disciplines. Core Concepts of the Standard
Many factories and power plants built in the late 90s and early 2000s were designed strictly according to IEC 61346. Maintenance Documentation: iec 61346-1 pdf