当你将电缆穿孔时，电缆在两个金属锯齿中下沉，这样就将电缆的塑料绝缘套剥离。
As you punch it down, the cable descends between the two metal teeth, which remove its plastic insulation (it's called insulation displacement) and the cable is cut.
电缆内端头应使用钢制封帽，与金属套的密封必须采用铅封，密封性能良好。
Cable inner end must use steel nut cap. Lead sealing is required for the sealing between the cable inner head and metal sleeve, which has a good sealing property.
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