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Old 08-13-2013, 08:48 AM   #1
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Receptacles on either sides of an inside corner


I have an inside corner, both walls are exterior - concrete blocks.

I wanted to have a receptacle on each wall, at same height, about 6" or so from the corner.

Since my home is all EMT and metal boxes, I'd prefer to use a EMT conduit to bridge the boxes but I can't do that with the concrete block inside corner. There is not enough room to make a sweeping curve, the furring strip is only 1/2" thick behind the sheet rock. To use EMT I need to go all the way up to the attic, then over for like 8" then all the way back down. I don't think those metal corner elbow boxes would work for this. Is there another trick I am not aware of?

Another possible solution is to cave in and use a short piece of romex between the two, hugging the wall around the corner. As long as I connect the ground wire of the romex to both boxes, I still have "ground continuity" across the whole system right? I have conduits everywhere else.
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Old 08-13-2013, 09:15 AM   #2
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Receptacles on either sides of an inside corner


If you code requires conduit, use conduit. If not "Romex" is fine.

You could use FMC (Flex. Metal Conduit; ie: Greenfield)

You will have to remove drywall to get around the corner.

How are you going to have enough depth for mounting the boxes?

Have you considered surface mounted Wiremold?
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Old 08-13-2013, 10:11 AM   #3
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Receptacles on either sides of an inside corner


If your in Miami FL. Romex is fine.

However, your idea of going up and over with conduit is a great idea. A pro will not do this as it takes to long.
MC cable is second best to conduit and is flexible as rj mentions above.

How do you plan to mount the boxes in the block? Or are you mounting them to the block surface?

Secure the boxes and get a cable or conduit to each one and call it a day. Good luck.

Don't forget they must be GFCI protected.
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Old 08-13-2013, 10:58 AM   #4
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Receptacles on either sides of an inside corner


To clarify, there is no drywall there NOW, all that's been removed as part of the remodel.

So I can attach the boxes directly to the blocks with Tapcon screws.

The depth is not a problem. The existing metal box is shallow, like 1" thick (I took it to a supply house and they said they made these years ago but not anymore). The furring is 1/2" the sheet rock is 1/2" thick so it works. The new one I am adding is tricky. It's standard depth so I have to cut a hole in the block to recess the box. That's why I wanted it 6" from the corner that way I can hit the thinnest 4" square of the block and avoid the edge and the web.
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Old 08-13-2013, 09:19 PM   #5
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Receptacles on either sides of an inside corner


Those boxes will not be legal...and most likely the reason they are not made anymore.
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Old 08-14-2013, 10:09 AM   #6
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Receptacles on either sides of an inside corner


Sorry. I thought you meant they were outside.

If you have no drywall in place, install 1900 boxes and mud rings. Use a mud ring one size thicker than the drywall will be for perfect fit. Perfectly flush is what I mean.

Or you can use plastic boxes and Nm cable. This is the easiest way.
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Old 08-14-2013, 04:39 PM   #7
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Receptacles on either sides of an inside corner


Due to the shallow depth of the wall, I would use conduit for sure to avoid nails and/or screws being driven into the wire and causing a short circuit... or worse. Instead of a flex conduit, use a ridged conduit and a 90 degree elbow. since the boxes are only 6" in from the corner, you will only need 1-2 feet of conduit. Good luck with your project!
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Old 08-14-2013, 07:16 PM   #8
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Receptacles on either sides of an inside corner


Quote:
Originally Posted by diyer111 View Post
Due to the shallow depth of the wall, I would use conduit for sure to avoid nails and/or screws being driven into the wire and causing a short circuit... or worse. Instead of a flex conduit, use a ridged conduit and a 90 degree elbow. since the boxes are only 6" in from the corner, you will only need 1-2 feet of conduit. Good luck with your project!
If by a "90 degree elbow you mean a pull elbow



or a LB fitting

They must be left exposed
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Old 08-14-2013, 07:21 PM   #9
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Receptacles on either sides of an inside corner


It is possible to bend conduit for an inside corner. Basically you have 2 back to back 90's that are 90 degrees to each other. One is flat the other turns up.
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