GB/T 4728.2-2005 Graphical symbols for electrical diagrams- Part 2 Symbol elements,qualifying symbols and other symbols having general application (English Version)
GB/T 4728 "Graphical Symbols for Electrical Diagrams" includes 13 parts: general requirements; symbol elements, limited symbols and other commonly used symbols; conductors and connectors; basic passive components; semiconductor tubes and electronic tubes; generation and conversion of electrical energy ; Switching, control and protection devices; Measuring instruments, lamps and signaling devices; Telecommunications: switching and peripherals; Telecommunications: transmission; Building installation floor plans; Binary logic elements; Analog elements.
GB/T 4728.2-2005 history
2018GB/T 4728.2-2018 Graphical symbols for electrical diagrams—Part 2:Symbol elements,qualifying symbols and other symbols having general application
2005GB/T 4728.2-2005 Graphical symbols for electrical diagrams- Part 2 Symbol elements,qualifying symbols and other symbols having general application
1998GB/T 4728.2-1998 Graphical symbols for diagrams. Part 2: Symbol elements, qualifying symbols and other symbols having general application