In the mid-1980s,the former National Bureau of Standards issued a batch of national standards for electrical drawing and electrical graphic symbols for the first time,including GB 4728″Graphical Symbols for Electrical Drawings”13 items,GB 6988″Electrical Drawings”7 items,GB 5465″Electrical Equipment Graphical Symbols”2 items and GB 5094″Item Codes in Electrical Technology”,etc.These standards are based on the corresponding IEC standards and related documents.In 1987,the former National Bureau of Standards issued Document No.079″Notice on the Comprehensive Implementation of National Standards for Electrical Drawings and Graphic Symbols in the National Electrical Field”,which stipulated that from January 1,1990,all electrical technical documents and drawings shall use the new National standards,no longer allowed to use the old national standards.
80年代中期,原国家标准局首次发布了一批电气制图和电气图形符号国家标准,包括GB 4728《电气图用图形符号》13项、GB 6988《电气制图》7项、GB 5465《电气设备用图形符号》2项及GB 5094《电气技术中的项目代号》等。这些标准依据相应IEC标准和有关文件编制。原国家标准局于1987年下发079号文《在全国电气领域全面推行电气制图和图形符号国家标准的通知》,规定自”1990年1月1日起,所有电气技术文件和图纸一律使用新国家标准,不准再使用旧的国家标准。
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