Regarding the multi-core power cord, in order to ensure the degree of forming and to reduce the shape of the power cord, it is generally required to twist it into a circular shape. The mechanism of stranding is similar to that of conductor stranding. Because of the large diameter of the stranding, most of the methods are not back-twisted. The technical requirements for cable-forming: First, the twisted-out insulated core turns over and causes the cable to twist; the second is to avoid the insulation layer being scratched.
Most of the cables are also completed in the other two processes: one is filling, the rounding and unchanging of the cable after the cable is wrapped; one is tying, and the cable core is not slack.