电缆桥架各连接部位的螺栓紧固
桥架母线槽电磁感应在保护地线上感应的故障电流经实测比理计算还要高出50%，同时三相导电排距PE间距不等，电感也不等，线路较长时，在故障电流下，三相严重不平衡。外面接触不到母排，可防止外物造成短路；由于山东电缆桥架密集型母线槽外壳作PE线，人触到外壳也是的；母线槽单位体积较小，安装后比较美观；便于分接馈电、维护方便。
The electromagnetic induction of the bridge bus slot electromagnetic induction on the protected ground line is 50% higher by the actual measurement. At the same time, the three-phase conduction distance PE distance is different, the inductance is not equal. When the line is long, the three-phase is seriously unbalanced under the fault current. The outer contact can not reach the busbar, which can prevent the external material from short circuit; because of the PE line of the dense busbar of the cable bridge of Shandong cable bridge, it is also safe to touch the shell; the busbar slot is small in unit volume and is more beautiful after installation; it is convenient for feeding and maintenance.
这样无论是短时还是持续相对地短路故障，这种接地方式都比单独设置PE排好。因此电气技术委员会公布及提倡电汇排(母线槽)以外壳作为接地导体。封闭式母线槽各功能单元的连接部件及活动接头上的铜排表面必须清理干净，外壳内和绝缘子安装前也应擦试干净不得有物。竖井内高压、低压和应急电源的电气线路，相互之间应保持0.30m及以上距离或采取隔离措施，并且高压线路应设有明显标志。
In this way, the grounding mode is better than the PE alone, both in short time and in continuous short circuit. Therefore, the International Electrotechnical Commission announces and promotes the use of the busbar as the grounding conductor. The connecting parts of each functional unit of the closed busbar and the copper surface on the movable joint must be cleaned up, and the shell and insulator should be cleaned before the installation of the remnants. The electric lines of high pressure, low pressure and emergency power supply in the shaft should maintain 0.30m and above distance or take isolation measures, and the high voltage lines should have obvious signs.
外壳的相间短路板应位置正确连接良好，相间支撑板应安装牢固，分段绝缘的外壳应做好绝缘措施，外壳各连接部位的扭距螺栓应用力距板手紧固，各接触面应封闭良好，母线槽的紧固件必须用热镀锌制品。强电和弱电线路，有条件时宜分别设置在不同竖井内。
The interphase short circuit board of the outer shell should be properly connected, the interphase support plate should be firmly installed, the insulating shell should be insulated, the torque of each connection part of the outer shell is fastened to the plate hand, the contact surface should be closed well, the fastener of the busbar groove must be hot-dip galvanized. Strong and weak electric circuits are set up in different shafts under suitable conditions.
采用导电性能良好的非磁性材料铝合金外壳做保护地线，包围在导电排四周，由于山东电缆桥架尽可能的靠近三相母排，可做到电抗小，且保护地线与三相母排距离相等，电抗相同。
The non magnetic material aluminum alloy shell with good conductivity is used as the protective earth wire, surrounded by the conductive row. As the Shandong cable bridge is as close as possible to the three-phase bus, the reactance can be minimal, and the distance between the protective ground line and the three phase bus is equal, and the reactance is the same.
如受条件限制必须合用时，强电与弱电线路应分别布置在竖井两侧或采取隔离措施以防止强电对弱电的干扰。密集型母线槽外壳各连接部位的扭距螺栓需要用力距板手紧固，保证各接触面封闭良好；安装时需要认真对照密集型母线槽系统图，检查所有规格、型号避免盲目安装，造成返工影响施工安装质量。
If the condition restrictions must be used together, the strong and weak lines should be arranged on either side of the shaft or isolation measures to prevent strong electricity from interfering with weak electricity. The torque bolt of each connection part of the dense busbar shell needs to be fastened to the plate hand, and the contact surface is well closed; when the installation is installed, it is necessary to carefully compare the dense busbar system diagram, check all specifications and models to avoid blind installation, and cause the rework to affect the quality of construction and installation.
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