Because IEC 61346-1 is obsolete, you should refer to the updated series for new projects: IEC 81346-1:2022
: Standardizing how components are labeled on circuit diagrams and P&IDs (Piping and Instrumentation Diagrams). iec 61346-1 pdf
Many international tenders, particularly in Europe and Asia, mandate compliance with these structuring rules for all engineering drawings and bills of materials (BOMs). Because IEC 61346-1 is obsolete, you should refer
If you are upgrading from an old system, look for the IEC 61346-1 . This version shows deletions (strikethrough) and additions (red text) compared to the previous edition. Because IEC 61346-1 is obsolete