Home / Standards / GBT 4728.3-2018 GBT 4728.3-2018 Graphical symbols for electrical diagrams — Part 3: Conductors and connecting devices 电气简图用图形符号 第3部分:导体和连接件 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A