"...Does that mean that it is a design manual for trained persons?"
Probably meant as a joke, but a lot of people do seem to take the "NEC Handbook" as a design spec. To the point of citing things like the outlet in a closet in another post.
Myself, I just couldn't find anything that cited those crimp connectors, but I hate to depend on that given my ability to miss things. Plus, things that are unusual tend to attract attention, and that's not always good just by itself...
