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广大农村、城镇的民用点,近几年来自来水工程发展很快,有的管道破损处远离电力线路,电焊机的使用电压大都是380伏,须架设两相三线的临时线路,才能为电焊机和照明提供电源。但往往受到条件或材料限制,特别是夜间的应急抢修,有时被迫造成只有相线而没有零线,为不耽误修复时间,采用下述三种方法解决夜间照明的电源问题,现提出供有关人员参考。一、当只有一只220伏灯泡时,接线见图
The civil points of rural areas and towns have developed rapidly in recent years, and some pipelines have been damaged far away from power lines. The voltage of electric welding machines is mostly 380 volts. Two-phase and three-wire temporary lines must be erected to provide electric welding machines and Lighting provides power. However, it is often restricted by conditions or materials, especially emergency repair at night, sometimes forced to cause only the phase line and no zero line. In order not to delay repair time, the following three methods are used to solve the problem of night lighting power supply. Staff reference. First, when there is only one 220 volt light bulb, the wiring is shown in the figure