There is also a fitting for AC cable (wiremold 5790B) but the instructions seem to imply that you use a "short section of raceway to the fitting" (from a box where the splice would be made?). I agree it is hard to find anything firm about how these are installed in the PDFs I have looked at. I'm sure a careful installer could stuff 2 wirenuts in this "mouse" but I agree it is a violation of the box fill rule.
#99401 - 06/28/0503:22 PMRe: Does this fitting show marking with that information?
I believe it is improper to apply the box fill rule here....assuming the component is part of a listed system. As such, a determination was made that there was adequate space. A similar situation occurs with every bath fan...the wiring space is a lot less than your usual box.
I actually think that these things are treated a 'appliances,' as their application is so narrow.
FWIW, I think you'll find the elbows in these systems are also somewhat tighter than we are allowed to make. And I defy anyone to pull wire through a 'completed raceway' of this stuff....you have to piece it together as you go.
#99402 - 07/22/0505:13 PMRe: Does this fitting show marking with that information?