IEEE Standard for Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters)
IEEE电气和电子图图形符号标准（包括参考命名字母）
1975-12-29
GB/T 24340-2009
工业机械电气图用图形符号
Graphical symbols for use on electrical diagram of industrial machines
2009-09-30
IEEE/ANSI Y32.9-1972
American National Standard Graphic Symbols for Electrical Wiring and Layout Diagrams Used in Architecture and Building Construction
美国国家标准建筑和建筑用电气布线和布局图图形符号