Thanks , I was looking for an out for a problem I have. We installed some plastic fs boxes in a concrete pour. Not realizing that they were putting marble on these walls . Now my fs boxes are about 1 1/2 inches back of the finshed stone. Tried using a handy box collar but it doesnt cover the whole box. About 1/8 inch gap on each side. any ideas ?
I have heard a lot of yacking about extension rings and nobody has come up with a real reason that you couldn't gang a dozen together. Just watch your conductor length. You still need 6" at the edge of the last ring. In the ceiling of the great room of the Ca-D-Zan there are a buttload of 3" rings to get them from the box in the structural ceiling down to the finish of the antique mohogany ceiling we couldn't touch.
I've got a reason for not using a dozen extensions in an installation.
I was rewiring a beach snack bar in San Clemente a few years ago and they stacked 5 extensions into a block-and-plaster wall, with the conduit and wire coming into the deepest box. Although I agree that it may not present a safety or fire issue, I can tell you that re-pulling that wire was no day in the park.