住宅没筑中的楼梯及通道,是居民必经之路。过去,这些部位照明灯的控制,都是采用普通拉线开关或搬把开关。一幢六层住宅楼的楼梯间,需设六个拉线开关或十一个双控开关,操作复杂,经常出现长明灯。为此,北京市建筑设计院八室与北京电器厂共同协作,于1981年 The staircases and passages that are not built in the residence are the only way for the residents. In the past, these parts of the lighting control, are using ordinary pull switch or handle switch. A stairwell in a six-story residential building requires six pull switches or eleven dual-control switches. The operation is complicated and the lights often appear. To this end, the Beijing Office of Architectural Design and the Beijing Electric Appliance Factory co-operated in 1981.