为了节约电能和开关电灯方便,可在走廊、大厅、楼梯等地方安装几个开关,对一盏灯进行多处控制。所用的开关为三线单刀双掷式开关和四线双刀双掷式开关。本文介绍的二处、三处和四处控制一盏灯线路图中都采用了一对三线开关。一个三线开关的共用端接电源线,另一个三线开关的共用端按照明灯(见 In order to save energy and switch lights conveniently, several switches can be installed in corridors, halls, stairs, etc. to control multiple lights. The switches used are three-wire single-pole, double-throw and four-wire, double-pole, double-throw switches. A pair of three-wire switches are used in the two-, three-, and four-way control one-lamp circuit diagrams introduced in this paper. A common three-wire switch terminates the power cable, and the common terminal of another three-wire switch follows the light (see