That, Greg, is where, IMO, our friend at UL are more than a little dishonest.
I guarantee that they answer nearly every question with some variation of 'we don't know.' "Has not been evaluated" is one of the more common examples.
Take ANY electrical fitting with specified pipe threads on it. NONE of those threads have been 'evaluated' for connection to anything else with pipe threads.
Or, take wire nuts. NO wire nuts have been 'evaluated' for use with the wires twisted together. Nor is UL willing to say that twisting the wires is in any way incorrect.
So, your construction that 'not evaluated' means 'not listed' is incorrect. Tempting as it is, the two statements are not the same.
"Not evaluated" may mean nothing more than that the testing protocol did not consider that particular situation. An example might be to ask about painting cabinets and conduit. While the testing standard requires some corrosion protection on the unit before it gets the lable, the question of someone adding paint later is generally not addressed. Very few things have ever been 'evaluated' for a coat of paint. Or, for that matter, cleaning with soap and water. It's just not part of the protocol.
