How deep does PVC need to be in concrete slab?

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Old 09-28-12, 07:39 AM
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How deep does PVC need to be in concrete slab?

OK in preparation for the kitchen island - I'm cutting a channel into the slab to run electric (about 2' from the wall)- I cut down about 2.5" and about 3.5" wide in the concrete - I rented a power chisel. To go deeper seems to really be a challenge- Can I lay the PVC in and cover with concrete from here? What determines the depth that it needs to be? I can't see weight being an issue- Once the concrete hardens around the PVC and the floor gets installed.....thoughts? suggestions?
 
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Old 09-28-12, 08:00 AM
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Rigid metal conduit would be better though harder to work with but wait for the pros to say if PVC is acceptable.
 
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Old 09-28-12, 08:49 AM
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PVC is my second choice for conduit in concrete. My first choice is smurf tube, for ease of working. No metal pipe or fittings in concrete - they will corrode.

That said, 1-1/2" to the top of the pipe seems a bit shallow. I like 4" of concrete over the pipe, even when that means that the bottom of the pipe is lying on the gravel bed. Slicing the slab with a diamond-tipped circular blade on the end of a saw before hammering the center out makes the work go faster. A masonry saw should be available for rent locally.
 
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Old 09-28-12, 08:58 AM
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Thanks Nashkat- what is the downside to not putting it 4" ? Will it affect the integrity of the conduit or the finished floor?
 
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Old 09-28-12, 12:31 PM
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what is the downside to not putting it 4" ? Will it affect the integrity of the conduit or the finished floor?
The finished floor; the pipe is plenty sturdy.
 
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Old 09-28-12, 12:45 PM
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You need to make room for the turns or elbows you are using bends correct?
 
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Old 09-28-12, 12:55 PM
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Welcome to the forums!

When you say
You need to make room for the turns or elbows you are using bends correct?
are you saying that the pipe should be deep enough that the bends should finish below the surface, and the pipe emerge as a vertical run?
 
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Old 09-28-12, 12:56 PM
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yes elbows fit fine when I test fitted them
 
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Old 09-28-12, 01:43 PM
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yes elbows fit fine when I test fitted them
PVC or rigid elbows? I know I said no metal in the concrete, but I do usually use the rigid to come out of the slab. Of course, that's for commercial work with heavyweight wire pulls and all wiring in conduit.

While you do need a continuous run of conduit, guarding against damage during the wire pull is not really a concern with a little run like this. If they fit fine and turn up where you need them, you should be good.
 
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Old 09-28-12, 01:46 PM
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3/4" PVC elbows .....hope that helps
 
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Old 09-28-12, 01:50 PM
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3/4" PVC elbows .....hope that helps
For 3 12AWG conductors? A man after my own heart!
 
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Old 09-28-12, 03:56 PM
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PVC under a building, the required depth is 0". I like to put it just below the concrete.
 
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