This part of GB/T 16675 specifies the general simplified drawing methods used in technical drawings (mechanical, electrical, architectural and civil engineering, etc.). This section applies to technical drawings and related technical documents drawn by hand or computer.
GB/T 4728.2 Graphical symbols for electrical diagrams—Part 2:Symbol elements,qualifying symbols and other symbols having general application*, 2018-07-13 Update
GB/T 4728.3 Graphical symbols for electrical diagrams.Part 3:Conductors and connecting devices*, 2018-07-13 Update