I need to re-route some romex 12 gauge wire in my basement ceiling. I've got a Tyco Cable Splicing Device. In the instructions, it does not show the individual wires as being stripped, but they don't fit very well if they are not stripped and I'm not sure if they would make a good contact if they weren't stripped. Do I need to strip them a bit? The info on the packaging says: ENERFLEX kit nonmetallic cable splice TYCO P/N 1116377-2