重庆升降平台工作时，随着吊笼上下运动，随行电缆同时盘出或盘入圆形电缆笼，在做圆周形的盘入或盘出过程中，芯线和外层橡皮护套之间会发生相对位移。由于升降平台各芯线位移的大小不同且不能复原，使用了一段时间后，某一根（或几根）芯线就会在电缆不同部位呈U型局部堆积，最终产生鼓包现象，接着该处的外皮出现破损，进而出现断芯、漏电等现象。

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.