On Tue, 20 Mar 2007 22:22:40 GMT, Owen Duffy wrote:

My understanding is that NEC4 might provide a good estimate of the
difference between insulated and uninsulated wire. I don't have NEC4 and
am looking for someone who might be prepared to run a bunch of models for
me in batch mode. I would supply the model decks and a batch file to run
them, my volunteer would need to run the batch file and zip the output
files up and mail them back to me for analysis.

EZNEC, the free version, supports insulated wire - unless you want to
bury it.