Old Work Box

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For cutouts in plywood, as opposed to frame mounted receptacles.


Old work box in 60 seconds:





Note on dimensions - the outlet mounting screws form the outer edge. These screws are protrusions, or inside the box, but their outer dimension defines the height of the box. That appears to be 3-5/8". It is safe to do 3-3/4" as the 4 front tabs are larger than this. The locking tabs on the back are even larger.

It seems safe that 3.75 is a safe height of cutout, and 2-3/8" is a safe width (widths all appear to be 2.25").

  • 3-7/8-Inch Length by 2-3/8 [1]
  • 4-1/8 x 2-1/4 [2]
  • 2-3/4 in x 2-1/4 in [3]
  • 2.75 x 2.25 x 4.3 [4]
  • 3.65 x 2.3 x 4.3 [5]
  • 2.25 x 4.38 x 2.75 [6]

Allowed in New Construction



From [7]

Just a heads up, if the wall is fire rated the box must be secured to the stud regardless of the box listing. This is a building code issue not a electrical code issue.

I have no idea if the opening posters wall is fire rated.