Romex in conduit outdoors

[Stevenfyeager]

I realize romex is not supposed to be in conduit outside. An outside AC disconnect is fed by 10-2 romex inside 1/2” liquid tight about 4’ long. Should I correct it? I think heat build up is the main concern? Thanks

 

[Ken_S]

Heat isn't the issue, it's a listing issue for wet locations that is the problem.
NM cable cannot be installed in a wet location, inside of any conduit outside would be considered a wet location.

 

[infinity]

It's not code compliant so I would just rip of the NM cable and install THHN/THWN. Having said that the NM cable will likely last longer than the unit it's feeding.

 

[tom baker]

The inside of a outside conduit is a wet location. NM is not allowed in a wet location. this location will have water from condensation.

 

[Srv52761]

I believe 10-2 with ground nm-b exceeds the fill capacity of 1/2” liquid-tight.

 

[Dennis Alwon]

Just a reminder to NC electricians that we have an amendment that allows NM up to 6' in conduit outside

AMENDMENT 300.9 Amend NEC 2017, page 139: 300.9 Raceways in Wet Locations Abovegrade.

Where raceways are installed in wet locations above grade, the interior of these raceways shall be considered to be a wet location. Insulated conductors and cables installed in raceway in wet locations above grade shall comply with 310.10(C). Exception: The raceway shall not be considered a wet location if:

(1) The section of raceway routed in a wet location above grade does not exceed 1.8 m (6 ft) in length;

(2) Any fittings or conduit bodies are watertight and listed for use in wet locations; and

(3) All termination points of the raceway are only open in any of the following:

a. A dry location;

b. Equipment suitable for outdoor use; or

c. Equipment listed for use in a wet location.

 

[electrofelon]

in a pinch if you didn't have any THHN, a bus full of nuns would probably not die and probably no one would notice if you stripped the NM and used the black inners for your two line conductors. (I have never ever done that of course).

 

[James L]

If you found the lowest point of your liquid tight, and drilled a hole in the bottom of it, you probably wouldn't have much of an issue with water buildup. Not that I've ever done it or anything like it

 

[Fred B]

in a pinch if you didn't have any THHN, a bus full of nuns would probably not die and probably no one would notice if you stripped the NM and used the black inners for your two line conductors. (I have never ever done that of course).

Now I've never done but wondering, any code issue involving the use of bare EGC in with the insulated ungrounded conductors in the conduit. I've always just used green insulated EGC when running THHN.

 

[Dennis Alwon]

Now I've never done but wondering, any code issue involving the use of bare EGC in with the insulated ungrounded conductors in the conduit. I've always just used green insulated EGC when running THHN.

It's compliant but I doubt bare Conductors may be hard to find especially in sizes 10-14 awg

 

[Rick 0920]

I was failed on a pool job by stripping the outer jacket off the conductors. The "B" in NM cable only means that the insulated conductors are rated for 90° C. heat. There is no marking on the conductors that is inside NM cable, so the violation lies with Art. 310.8 (A) & (A)(1). These conductors will more than likely outlive us and our grandchildren before there are any issues, but unfortunately some of these BS codes really make little sense. But it says what it says, not what I think it should say!

 

[LarryFine]

But it says what it says, not what I think it should say!