I played with a Kup-L-Tap a while ago and it looks like it would straighten out the conductor enough to work in that little piece it hooks to when you tighten it up.
This is an insulation piercing deal and I always questioned just how well they work under a high load.
It does look like it was designed to steal power tho. If I was tapping something I could turn off, I would use a more conventional tapping method.
