在连接UPS的交流引入线时，火线零线不允许接反（注意某些UPS还有相序之分）。
UPS to connect the exchange to introduce line, the battle line is not allowed to access anti-Line (Note that there are certain sequence of UPS's).
这一根是零线而不是火线。
现有的智能遥控开关是三线制接线方式，开关需要同时接火线， 零线，灯线才能工作。
The existing three-lane system is the smart remote control switches wiring, switches and the need to live, zero line, light line can work.
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