NEC - Conduit length inside cabinet

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gireland

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What part of NEC details length limit of conduit inside a residential kitchen cabinet?

Here is situation:

I have a 20amp circuit that feeds off a 20amp GFI wall receptacle out through a cabinet to a 15amp receptacle on side of the cabinet. The conduit contains 12 gauge wire and needs to be 6ft in length.

The floor is concrete so wire cannot come up from floor, and I do not want to run Romex under the cabinet since basements can flood.

Is it safe to use 6ft of conduit containing 12 gauge wire? I know wire needs to be derated if run through conduit but not sure how much.

Thanks,
Glen Ireland
 
I am not a contractor. Not sure how that got in my profile. I am just a person doing research before I call my electrician.
 
Your electrician will know the answer to this question. Up to 3 current carrying conductors may be run in conduit without derating. Over that the derating factor is dependant upon the number of conductors in the conduit. Since #12 THHN has an ampacity of 30 amps, but must be fused at 20 amps it is not usually an issue.
 
Thanks! My main concern was the 6ft length. I have read code that says to derate wire through conduit longer than 600mm (2ft) when two or more multiconductor cables are run. And no where in my residence is any conduit longer than 2ft.

If I put your post together with what I read, that leads me to believe running two conductors in conduit for 6ft should not be an issue.
 
Depends on what you mean by conductors. If you are installing individual conductors such as THHN there will be no derating needed unless you exceed 3 current carrying conductors. If you are installing two cable assemblies (such as NM cable commonly known as Romex) you may need to derate, but since you have a 10-amp cushion it should still not be a problem. If you are installing type NM in conduit, calculating conduit fill becomes problematic as the area of the cable is not readily available. This is fairly basic stuf, so any qualified electrician should be able to figure this out with no problem.
 
Thanks again. This forum is over my head. I will talk to my electrician.

The conduit in my residence is flexible metal containing black, white, green ground wires and clear plastic insulation. It does not contain the actual Romex cable. I thought this equated to running two conductors through a conduit.
 
That is not conduit. That sounds like MC cable. You had better let the electrician handle it. MC cable is pre-made cable assembly. Conduit is a system that is field installed and then the wires are pulled in.
 
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