George,
The code does not require anything to be UL Listed.
actually it does, for example look at 35x.6 through 362.6 conduit articles.
I agree with the jest of your post though and think many inspectors now use listings as a crutch.
I have no problem say with rewiring (rebuilding) antique (unlisted) fixtures for use.
Happy and safe Holiday wishes!
Roger
[This message has been edited by Roger (edited 12-24-2004).]