This standard specifies the general rules for electrical engineering CAD drawings. This standard applies to electrical functional diagrams (including schematic diagrams, functional diagrams, and circuit diagrams) and wiring diagrams.
GB/T 18135-2000 history
2008GB/T 18135-2008 Electrotechnical engineering drawings rules of CAD
2000GB/T 18135-2000 Electrotechnical engineering drawings rules of CAD