I have noticed that it seems to be common practice in my area to strip stranded wire and leave the insulation on the end of the wire to hold the strands together and then wrap this around a termination screw on a recepticle or a switch. I am sure that I saw a comment and illustration in an old Handbook I had that illustrated this as being a wrong practice, but have looked since and cannot seem to locate this information. In my understanding, stranded should only be terminated using crimp ons or on a termination screw with a cup or where the device has pressure plates. Could anyone help on this?