NM in conduit?

[searcyei]

Is it legal to install romex in conduit/flex?

 

[roger]

Yes it is, see any of the conduit or tubing XXX.22 sections.

For example 358.22

358.22 Number of Conductors.
The number of conductors shall not exceed that permitted by the percentage fill specified in Table 1, Chapter 9.
Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The number of cables shall not exceed the allowable percentage fill specified in Table 1, Chapter 9.

Roger

 

[don_resqcapt19]

Make sure you look at Chapter 9, Table 1, Note 9. You need a large conduit for NM cables.

 

[TODD B.]

What about SE cable run inside conduit?

 

[kwired]

The question is why do you want to do so other than for limited portions where you are maybe providing physical protection?

I see that a lot where someone runs a bunch of raceway and then pulls NM cable through it.

1. it pulls harder, and fills the raceway quicker than individual conductors

2. it costs more than using individual conductors

3. if a metallic raceway, you can eliminate one conductor and use the raceway as the equipment ground cutting cost even more.

Most of time when I see it, it was done by some DYI or handiman that doesn't know any better.

I see this a lot with burying a raceway and then they pull UF cable through it.:? Talk about making it harder than it needs to be - 3-#12 THWN pulls easy compared to pulling a 12-2 with ground UF cable.

 

[Dennis Alwon]

The obvious answer is yes but the longer version is that NM may not be installed in conduit when run on the exterior of the building, ie wet locations

 

[ActionDave]

The question is why do you want to do so other than for limited portions where you are maybe providing physical protection?...

Most of time when I see it, it was done by some DYI or handiman that doesn't know any better....

I see it a lot too. Often times, judging by the work that I see, the work has done by electricians that apparently only carry romex in their truck.

 

[dicklaxt]

The fill is often overlooked in that if there is only one NM cable, the fill is based on 53% and not 40%. This could be a cost impact somewhere along the line.

dick