According to the maintenance experience of cable lines, most of the faults of cable lines occur in the sealing of cable joints, so it is very important for the design, construction and maintenance of the proper sealing materials and methods to properly seal the whole plastic cable joints.

1, all plastic cable continuous casing and its installation of technical requirements: the external environment of the all-plastic cable line is complex and changeable, the external influence factors are more. Consideration should be given to the effects of recurrent factors, such as summer sun exposure, low temperatures and glacial temperatures in severe winters, wind and rain and temperature changes, and moisture moisture, as well as the effects of sudden phenomena such as thunderstorms, typhoons, earthquakes and power burns, leakage and corrosion of DC pipelines, etc.

2, the technical requirements of full plastic cable joint sealing

(1) has a strong mechanical strength, the joint should be able to withstand a certain amount of pressure and tension.

(2) has a good sealing, can meet the requirements of air closure.

(3) Easy to construction and maintenance, easy to operate.

(4) has a long service life.

3. Selection of heat shrinkable casing

According to the outer diameter of the cable, joint opening, connector outer diameter, cable gas retention requirements, select imported, domestic products.

4. Heat shrinkable Casing Assembly

电缆线路为什么会用到热缩套管

根据电缆线路的维护经验，电缆线路的故障大部分发生在电缆接头封合处，因此选用合适的封合材料和方式正确进行全塑电缆接头封合对设计、施工和维护工作具有极其重要的意义。

1、全塑电缆接续套管及其安装的技术要求：全塑电缆线路的外界环境复杂、多变，外界影响因素较多。既要考虑经常性因素，如夏季烈日照射、严冬的低温和冰凌、风雨和气温变化、以及潮气水份带来的影响;又要考虑突发现象如雷电、台风、地震的影响和电力烧伤、直流管线的泄漏腐蚀等影响。

2、全塑电缆接头封合的技术要求

(1)具有较强的机械强度，接头应能承受一定的压力和拉力。

(2)具有良好的密封性，能达到气闭要求。

(3)便于施工和维护方便，操作简单。

(4)具有较长的使用寿命。

3、热缩套管的选型

根据电缆外径、接头开长、接头外径、电缆保气要求，选择进口、国产产品。

4、热缩套管组件