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公共楼道照明控制可以采用两处控制,如图1所示。当人进入楼门以后,在首层用开关1就可以将上层休息板上的灯点亮,人到2层以后,在2层用开关2也能将刚才开的灯关掉。反之,在楼上也可以先开灯,走到楼下再关灯,这样人走灯灭,有利于节约电能。同样的道理,可以实现在多处控制一个灯,如图2所示。图中的多控开关有两个动作位置,即1、4接通或2、3接通。用的都是双拉开关,每一个开关都能把原来的状态(通或断)改变过来。图中现在的位置是灯亮着,读者试将任何一个开关位置改变,就能使灯熄灭。开关的符号见图3所示,常用翘板式、搬把式、拉线式等。拉线式没有前两种美观,但是使用安全,常用于住宅楼内。开关的工作电压是250V,额定电流有1、2、
Public corridor lighting control can use two controls, as shown in Figure 1. When a person enters the building door, the light on the upper rest board can be lighted on the first floor with the switch 1, and after the person reaches the second floor, the light just turned on can also be turned off with the switch 2 on the second floor. Conversely, you can also turn on the lights in the upstairs, go downstairs and turn off the lights. By the same token, one lamp can be controlled in multiple places, as shown in Figure 2. The multi-control switch in the figure has two action positions, ie, 1 or 4 or 2 and 3 are on. The use of double pull switches, each switch can change the original state (on or off). The current position in the figure is lighted, and the reader will try to change any of the switch positions to turn off the light. The symbol of the switch is shown in Figure 3, commonly used rocker type, handle type, pull wire type and so on. There are no first two aesthetics for pull-wires, but they are safe to use and are often used in residential buildings. Switch operating voltage is 250V, rated current is 1, 2,