AutoCAD Electrical toolset provides library symbols that comply with the standards:
The IEEE and IEC library symbols are metric. To scale the symbols for imperial, use the Modify library symbols utility. The NFPA library symbols are in inches.
The JIC standard is no longer updated and was incorporated into the NFPA 79 standards. The NFPA standard states that the library symbols are in accordance with the IEEE 315/315A standard. AutoCAD Electrical toolset continues to provide the JIC and older IEC symbol libraries for legacy support.