Great response, Safetygem!
UL standards are not often actually seen, are pricey, etc. This makes it hard to have an informed opinion. If I had my druthers, UL would post them on the web- for free!
Which brings up a point that often gets overlooked: darn few thing are ever submitted to UL composed of materials designed for the intended application. Rather, UL takes the assembly, and evaluates it to see if it measures up. They really don't care if the thing is made of peanut butter!
So, it is conceivable that the infamous handybox/extension cord combo would, if submitted, pass UL's tests. Absent access to the UL standard, we really don't know.
I can say, with a reasonable degree of certainty, that not a single "outlet strip" made would pass UL tests for "pendant" devices- and OSHA tries to apply NEC "pendant" rules to such made-up assemblies.
