重慶升降平臺工作時，隨著吊籠上下運動，隨行電纜同時盤出或盤入圓形電纜籠，在做圓周形的盤入或盤出過程中，芯線和外層橡皮護套之間會發生相對位移。由于升降平臺各芯線位移的大小不同且不能復原，使用了一段時間后，某一根（或幾根）芯線就會在電纜不同部位呈U型局部堆積，最終產生鼓包現象，接著該處的外皮出現破損，進而出現斷芯、漏電等現象。

Ningbo lifting platform when working with the cage up and down movement, while the trailing cable tray or plate into a round cable cage, in a circular shape into a disk or disk out of the process, will be between the core and the outer rubber sheath relative displacement. Due to the different sizes of the core wire Ningbo lifting platform displacement and can not be recovered after use for some time, a one (or several) of the core wire will be in different parts of a U-shaped cable local accumulation, ultimately generating bulge phenomenon, then the the emergence of the damaged skin, then there broken core, leakage and other phenomena.