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Old 11-17-2011, 09:09 PM   #1
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Sufficient box volume in 2x3 wall


Hi,

I need to install an outlet in an existing 2x3 wall but can't figure out how to get enough box volume in this skinny wall. The studs are 2 5/8" with 7/8" of gypsum lath and plaster. I need 20.25 in3 of box volume to handle the 12/3 in and out and the device.

4x4 box with mud ring would give the volume, but how to set in as old work box with a single gang outlet? Using old work wings would bring the box flush with wall, but then faceplate won't cover if only trying to install one device.

Ganging together two single-gang old work boxes has the same problem of having a double gang exposed when I only need one.

The only thing I've come up with so far was to gang together two old work boxes, setting them behind the plaster, one covered with a faceplate, and the other with a box extender to bring it through the plaster.

Thanks

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Old 11-17-2011, 09:17 PM   #2
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Sufficient box volume in 2x3 wall


why are you using 12/3? do you need 2 circuits?

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Old 11-18-2011, 06:34 AM   #3
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Sufficient box volume in 2x3 wall


Try one of these with a ring.

http://www.aifittings.com/catalog/fa...-boxes/fsr404s
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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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