Can't tell you the date they started putting Category numbers on cables, for what you're using it for no problem. I still use (don't laugh) the old non-twised quad wire for some residential stuff, especially if I have to run it on the out side. It has a tougher jacket and doesn't rot with the UAV rays like this thin jacket stuff does, I do try to find the quad that says UAV resistant.
I do know the CAT ratings were after 84, only because it was post divesiture when then came out.
