The fitting most commonly used for this is the 2010 entrance end fitting.
It appears that this was a piece of used plugmold which was installed earlier with a feed coming into the back (see the KO in the bottom pic).
Any new plugmold I've seen in about the last 15 or 20 years has a grounding conductor put in by the manufacturer. Previously, there were only little prongs on the back of the receptacles to contact the base. I don't see an EGC in this one.
Man, this was one sick puppy that took the time to hack out that box...after all, plugmold is tough enough stuff to work with even using factory supplied parts!
Oh, there I see the ground...oops...S
[This message has been edited by electure (edited 10-11-2004).]