the home i'm roughing in right now will have a 2" thick "finished" concrete floor. i need to provide 5 floor boxes for receptacles, and was looking for reccomendations on what product to use. there is easy access from below. i've seen the pvc ones that you trim after the pour, but i think that those are made for when you are putting some other flooring product on top of the concrete(the trim ring is at least 1/4" proud of the concrete). maybe a 4sq. box with a 2 3/4" mud ring screwed from the underside of the sub-floor?
floor box for finished concrete floor?
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Buck Parrish
Senior Member
- Location
- NC & IN
That is not listed for concrete use.
I have seen adjustable floor boxes. But one for a 2" slab, might be harder to find.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
I would say that a 4" square w/ cover is listed for concrete use but not for use as a floor box. We put them in poured concrete walls all of the time. A floor box is required to be listed for the purpose. 314.27(C).
masterinbama
Senior Member
- Location
- Huntsville Alabama
If I am reading this right, is this an above grade slab? I would price it using poke thru devices.http://www.growtron.com/Hubbell-Bryant/frpt/index2.htm
Greg Swartz
Senior Member
- Location
- Colorado Springs, Colorado
Poke Thrus are good. And I like them. Also, Hubbell makes a metal floor box, similar to a 4 square.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Is this what you are looking for
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
Is this what you are looking for
I think that was what the OP was thinking about at first, but said that he thought the trim out kit would not be flush with an unfinished floor, but I think it would work with a trim made for tile floors. I like those boxes, I've even used them in wood floors by mounting a 2x4 between the joist under them to support the box.
alfiesauce
Senior Member
Is this what you are looking for
Be sure to check the minimum depth requirement if you try these, I think the instructions say you need 4" or something like that inside, so that's double the 2".
mdshunk
Senior Member
- Location
- Right here.
I'd just use a 4-square with a mud ring and a floor box cover for on it from these guys: http://www.arnev.com/floorboxes.htm
Something like this arrangement, but with a 4-square:
Something like this arrangement, but with a 4-square:
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