電纜終端頭是將電纜與其他電氣設備連接的部件，電纜中間頭是將兩根電纜連接起來的部件，電纜終端頭與中間頭統稱為電纜附件。電纜附件應與電纜本體一樣能長期安全運行，并具有與電纜相同的使用壽命。良好的電纜附件應具有以下性能： Cable terminal head is connect the cable and other electrical equipment parts, head of the cable is the two cables connected components, cable terminal head and middle term cable accessories. The cable accessories should be as long and safe as the cable body and have the same service life as the cable. Good cable accessories should have the following performance: a. 線芯聯接好: 主要是聯接電阻小而且聯接穩定，能經受起故障電流的沖擊;長期運行后其接觸電阻不應大于電纜線芯本體同長度電阻的1.2倍;應具有一定的機械強度、耐振動、耐腐蝕性能;此外還應體積小、成本低、便于現場安裝。 A) the connection of the wire is good: mainly the connection resistance is small and the connection is stable, which can withstand the shock of the failure current. In the long run, the contact resistance should not be more than 1.2 times the length resistance of the cable core. It should have certain mechanical strength, vibration resistance and corrosion resistance. In addition, it should be small, low cost and easy to install on site. b. 絕緣性能好: 電纜附件的絕緣性能應不低于電纜本體，所用絕緣材料的介質損耗要低，在結構上應對電纜附件中電場的突變能完善處理，有改變電場分布的措施。 B. good insulation performance: attachment cable insulation shall be not less than cable ontology, the lower dielectric loss of insulating materials used, on the structure of electric field in the cable accessories shall mutation can improve the processing, has changed the distribution of the electric field measures. 由于電力電纜制造長度有限，在一條電力電纜線路中間總有若干接頭，只有將各電力電纜連接起來才能正常工作，這種用來連接電力電纜的附件稱為電力電纜中間接頭，通稱電力電纜中間接頭或簡稱接頭。電力電纜中間接頭的外殼稱為電力電纜中間接頭盒。 Due to the length of power cable manufacturing co., LTD., a power cable line in the middle, there are several joint only connect the power cable can work normally, which used to connect power cable accessories, called power cable intermediate joint, known as power cable joint or joint in the middle. The outer shell of the power cable is called an electric cable intermediate connector box.