In extreme cases, failures caused by "corkscrews" and core ruptures brought entire production lines to a standstill, at high cost.
As a result, specialized, highly flexible cables were developed with unique characteristics to differentiate them from standard designs.
The cable cores are stranded firmly and left relatively long in several layers around the center and are then enclosed in an extruded tube shaped jacket.
The result is that no single core compresses near the inside of the bend or stretches near the outside of the bend—which reduces overall stresses.
Similarly, if cables are left to hang mid-air or run along the floor there is a heightened risk of injury.