This Saturday I was replacing a two-pin outlet for a grounded outlet (the system is grounded - I checked with a circuit tester).

The duplex outlet had two conductors per screw (someone in the past had ran power from this middle-of-the-run receptacle to another outlet). In order to fix this, I "pigtailed" the wires so that only one wire would be wrapped around each screw:
_____
_____}===X


OK, to explain my little ASCII art attempt

The continous top and bottom lines represent each wire that was previously wrapped to the scrw. The { is a splicing cap. The X is the screw.

Now....when I went to stick the device back in the box, I discovered that the shallow 4 x 4 box plus mudring was...well...full. This is a thin masonry wall in a housing project.

Having someone rip open the wall and replace the box with something much deeper would probably have been out of the question, so I used a metal starter box for Wiremold raceways - the ones with the open back to put over an existing in-wall device box.

This allowed room in the original box for the wires and the device was contained in the starter box.

Now...was this a proper solution or could this be a violation?

Picture this as putting in a raceway system and tapping off an existing box, but of course there's no raceway, it's only the box (with all knockouts closed).

I will have to do this again to another room where there are off-set open backed boxes that feed receptacles in adjacent rooms (the things are almost back to back, open in the rear so you can see the back of the receptacle in the adjoining room. Once again the lazy ass who tapped power from one room to the other did the two wires per terminal thing in a middle of the run outlet:


neutral------[||]----- existing wire (hot)

neutral------[||]----- existing wire (hot)
------ ----- new "tapping"

There is absolutely no more room in the box for the pigtails I'm going to use (and the splicing caps). It's already a tight squeeze in there with those receptacles. Ripping open the walls is not an option, that's for sure.

I hope I haven't confused you guys yet.

What would a REAL electrician do in this case?