The torch-cut photo appears to have been done with a plasma cutter. Excellent approach- it cuts cleanly and fuses the stray strands.
I use poly stretch wrap- the stuff they bind pallets with. They have it at OfficeMax and U-Haul. It wraps the cable but it is still thin enough to go through ferrules, etc. Duct tape usually isn't. We use a modified hydraulic hose cutter in the shop and a 5" disc grinder with 1/16" cutoff wheels in the field. Both work very well.