kitchen remodel - slab floor - recep in island

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royta

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Hello again, it's been a while.

I'm working on a kitchen remodel and suggested to the customer that a receptacle at the island would be a good idea. It is a slab floor. I plan on coming off of one of the receps (2x4 outside wall - So Cal) to a 4S box, then conduit from the 4S box, down the wall and through the bottom plate to the island. I see that FMC is off limits, but what about LFMC or LFNC? It is both suitable for direct bury, but I couldn't see whether or not it is suitable for contact with concrete. The nice thing about LFMC or LFNC is that if the customer was off by a couple inches on the location of the island wall, it would be much easier to break the concrete on the island end of the conduit and move it over slightly. This wouldn't be possible when using RNC, IMC, or RMC. If no LFMC or LFNC, what would you suggest?

Regarding minimum cover requirements in 300.5, would this be classified as "In trench below 50-mm (2-in.) thick concrete or equivalent" or "Under a building"? Or could I get away with just a notch in the slab?

Thank you.

Roy
 
I would use PVC. LFNC is not permitted in lengths greater than 6'. Not sure if either type can be installed in concrete. If location is really a problem there are other methods that can be employed to provide flexibility. 300.5 does not apply to your installation.
 
According to the UL white book, if LFNC or LFMC are listed and labeled for "direct burial" then it can be used in concrete.

LFNC is not permitted in lengths greater than 6'
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Unless you use LFNC-B, then you are able to use it in longer lenghts where secured in accordance with 356.30.

I agree with infinity, 300.5 does not apply to your installation.

Chris
 
So, I can notch the concrete? If yes, then I can fasten the conduit into the notch with 1-hole straps. I'm sure the flooring guy will want to fill the notch with cement, or whatever they use, in order to provide a solid foundation for application of flooring materials. The conduit needs to be suitable for installation within the concrete.
 
royta,

I just did a job similar to this. I cut the slab dug out the fill and laid in 3/4" schedule 40 pipe. all code compliant.
 
triphase said:
royta,

I just did a job similar to this. I cut the slab dug out the fill and laid in 3/4" schedule 40 pipe. all code compliant.
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No question that is code compliant. I was just looking for the easier (read, cheaper for customer) way. I'll certainly go that route if I have to. Thanks.
 
Several thoughts:

for LFNC, I would imagine that the requirements of 356.30 would be met by its burial in the concrete, as long as it doesn't float before the concrete cures.

I would use PVC mainly because it's cheap enough (as long as you charge for it), will stay straight (not float), and is, in my opinion, easier to pull through.

In either case, unless the concrete is more than 3 or 4 inches thick, I imagine cutting completely through it might be easier than trying to merely notch it.

If you want really cheap, cut through the concrete, run UF and bury it in the dirt, sleeve the ends through the floor with PVC pieces, and patch the concrete.
 
another thought if you cut a trench it has to be covered with at least 2 ins. of concrete above the conduit .If below the slab it has to be done in UF.If here the trench has to be open for the final inspect since the permit shows underslabs :wink:
 
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