This sketchup video tutorial is based on one of the useful plugins of sketchup alias Follow and Rotate. In this sketchup video one can find how to use this sketchup plugin for creating models of various styles of twisted cables.
Follow and Rotate (FAR) plugin is released by Wikii. The plugin works best for some specialized modeling like cables, ropes, spires, steeples, stalagtites/stalagmites, etc.
Link for download Rotate Sketchup Plugin