After selecting the block make sure directory is pointing to iec library folder (was nfpa). If you insert same symbol on the same drawing, you may need to swap the blocks (preciously you had issue with) using command AESWAPBLOCK, select option B.Replace NPFA with IEC as shown below (marked in RED), then save and close.

Open WD.ENV (in notepad) which is in the AeData folder (along with the Proj and Tutorial folders).Are they IEC or NFPA (I guess they are NFPA)? Click + of the Schematic Libraries to find out the default symbol libraries.Yet I checked before inserting an iec symbol and there are no blocks in the drawing with the same name. It's like a block from nfpa library with the same name as a iec one is already in the drawing and not getting redefined to the iec one when inserted. In the Project Settings tab click Schematic Libraries then click Default. Some of the iec symbols seem to get mapped to the nfpa ones. Download 15 Library Sketchup 3D Models (Recommanded). Free file: A product that is free of charge means it can be downloaded by anyone easily. Download quality brand specific and generic Sketchup BIM content free Category. Check your project properties: right click project> properties. To keep things this way, we finance it through advertising.Check your project Settings: right click project>Settings, in the lower window you can see what symbol libraries are used – IEC or NFPA?.What is happening here is your project is IEC standard project ie it supposed to symbols from IEC library folder whereas ACADE is defaulted to NFPA standard ie WD.ENV file is telling ACADE to use NFPA Symbols instead.

Autocad iec symbol library download