A little trick to using the hacksaw. Tape very tightly some insulation
tape around the cable and then cut through the middle of the pate. This holds the sheath tightly together around the cable and keeps the hole bundle tight allowing the blade to cut through a lot cleaner.
Another though, although an expensive road to go, is a large cable cutter
version of what Rick has shown you. This can then become a safety
item to cut the rigging
if that "unlikely case of an emergency" should happen. Oh hang about, you don't have rigging
do you. Oh well, buy the cheapies then, they will be handy for cutting any heavey electrical wiring