The basic requirements of line and branch
1·母线和分支接线须用 T2 铜材
1. Busbar and branch wiring shall be made of T2 copper
2·母线连接采用高强度专用螺栓连接， 接触面应镀锡， 应有足够和持久接触压力。
2. The bus connection adopts high strength special bolt connection, the contact surface should be tinned, and there should be enough and lasting contact pressure.
3. The expansion and contraction of the bus caused by the vibration and temperature change of the bus do not affect the contact characteristics of the bus connection.
4·母线固定应选用不饱合增强树脂（SMC） 为材质制做的专用绝缘支撑件， 以保证母线之间和母线与其它部件之间的安全距离和绝缘强度。
4. Special insulation support made of unsaturated reinforced resin (SMC) shall be used for bus bar fixation to ensure safe distance and insulation strength between buses and other parts.
5. The arrangement and connection of the bus bar and the insulation support shall be able to withstand the thermal stress and electric force impact caused by the rated short-time withstand current and rated peak withstand current of the device
6·母线穿过金属隔板之外， 应设计绝缘强度、 机械强度符合要求、 且安装简单而又牢固、可靠的绝缘套管和其它绝缘件。
6. Besides the bus passing through the metal partition, the insulating sleeve and other insulating parts with the insulation strength and mechanical strength meeting the requirements and simple, firm and reliable installation shall be designed.
7·每台柜内母线相对独立， 适于现场安装， 柜间母线连接设计有专用的连接板。
7. The bus bar in each cabinet is relatively independent, which is suitable for field installation, and the bus bar connection between cabinets is designed with special connection plate.
8·母线及馈出均绝缘封闭， 并具有检修时能可靠验电、 接地的功能， 保障检修人员的人身安全。
8. The bus and feed out are insulated and sealed, and have the function of reliable power test and grounding during maintenance, so as to ensure the personal safety of maintenance personnel.
9·铜排其折弯应无砸痕、裂口、毛刺，符合 DL/T 499 的规定。
9. The bending of copper bar shall be free of smashing mark, crack and burr, which shall meet the requirements of DL / T 499.
10·导体、 主母线及支线均采用矩形母线， 并采用不同相色热缩套管做绝缘处理。 热缩套管
10. The conductor, main bus and branch line all adopt rectangular bus, and adopt heat shrinkable bushing with different phase colors for insulation treatment. Heat shrinkable sleeve
不得开裂和起皱， 母线接头处用热缩绝缘盒封闭。 绝缘热缩护套材料应具备阻燃、 防腐、 抗老化的要求，老化寿命不小于30 年， 具体试验方法和要求参照 GB/T 2951.14 中规定执行。
No cracking or wrinkling is allowed. The bus joint shall be sealed with heat shrinkable insulation box. Insulation shrinkable sheath material should have flame retardant, anti-corrosion, anti-aging requirements, aging life is not less than 30 years, the specific test methods and requirements in accordance with the provisions of GB/T 2951.14.
11·导体须满足额定短时和峰值耐受电流的要求。 N 相（L0） 母线与三相母线规格相同,PE排截面不低于相排截面的 1/2。
11. The conductor shall meet the requirements of rated short-time and peak withstand current. The specifications of n-phase (L0) bus and three-phase bus are the same, and the section of PE bus is not less than 1 / 2 of that of phase bus.
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