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My wife purchased some new sconces for a room in our house. We're remodeling the room and I put round boxes in the wall in anticipation of the sconces. When the sconces arrived, they have a 4" X 1.75" box in them, with a mounting bracket that is 1.75" wide, horizontal to the light fixture.

What type of box do I need in the wall to accommodate these fixtures? I can't seem to find anything obvious. Alternatively, is there an adapter for a standard box (rectangle or circular) that would let me mount this? Fixure - what type of box in the wall to mount?

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    Do the instructions shed any light (no pun intended) on how to mount them?
    – JACK
    Commented Sep 19, 2021 at 15:58
  • Easiest thing would be to find a 5" round plate and stick that between your j-box and the sconce.
    – Aloysius Defenestrate
    Commented Sep 19, 2021 at 17:18
  • @jack - nothing else in the box. No instructions or diagrams.
    – Paul Kearney - pk
    Commented Sep 19, 2021 at 17:48
  • it will not cover any existing standard electrical box. blank round cover, make holes and may be painted.
    – user263983
    Commented Sep 19, 2021 at 17:54
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    Any chance that box pulls out of the fixture and is meant to be mounted to the wall?
    – JACK
    Commented Sep 19, 2021 at 17:57

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This is possible, but tricky

Your fixture appears to be designed to go over a standard single gang switch box, but the mounting crossbar is oriented the wrong way for doing that. As a result of that, and the fact that flat mud rings for 4" round to single gang aren't a thing, we'll need to get creative. The first part you'll need is a Satco 90-110 or equivalent 4" nominal crossbar, screwed to the existing crossbar on the back of the fixture to serve as an extension. From there, you can then attach the crossbar to the holes on a Garvin 54C41 or other similar 4" octagon/round cover for a single receptacle, mounted so that the holes are lined up horizontally. Note that you may need to mount the cover with the aid of a universal crossbar to get this to work.

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  • I plan to try mounting to a blank round cover first, and if that fails, I will try your crossbar suggestion. Thank you!
    – Paul Kearney - pk
    Commented Sep 19, 2021 at 19:47
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    @PaulKearney-pk -- you'll need a round cover with a 1/2" KO or some other usable hole in it for the wires to route through
    – ThreePhaseEel
    Commented Sep 19, 2021 at 20:00

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