Sticking my neck out since I don't have all the references available.
I understand that the insulation on URD is flamable and not to be used IN a building.
To be proper the URD is to have a termination where it emerges from the ground and another wiring method used from that point to the panel in the home.
In 25 years of inspecting I haven't seen it done that way yet.
Alan -- Inspector.
[This message has been edited by Alan Nadon (edited 07-29-2005).]
If it was easy, anyone could do it.