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.
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。
2
The casing pipe is mainly used to solve present technical problems, such as complicated technical process for cableendsealing.