Knob and tube wiring (sometimes abbreviated K&T) was an early standardized method of electrical wiring in buildings, in common use in North America from about 1880 to the 1930s. It consisted of single-insulated copper conductors run within wall or ceiling cavities, passing through joist and stud drill-holes via protective porcelain insulating tubes, and supported along their length on nailed-down porcelain knob insulators.
网络释义
1、瓷柱瓷管布线法
... knob and tube wiringn.瓷珠瓷管布线,穿墙布线 knob and tube wiring瓷柱瓷管布线法 A protuberance or knob.凸起物或门把 ...