All electrical equipment and equipment installation, maintenance, etc. must be electrical permit to operate, and can not live line work.
所有电气设备及器材的安装、维修等必须由持证电工操作，并不得带电作业。
Young black men in that line of work seldom live long.
干此行的年轻黑人很少能长命。
The existing three-lane system is the smart remote control switches wiring, switches and the need to live, zero line, light line can work.
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.
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。
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