Romex in conduit question???

[jango]

Can I get a little feedback/code reference with regards to having a 120V romex(es) pulled through a PVC conduit? I have a scenario where I have about 30' of 3/4" PVC conduit and I need to pull a 14/3 and a 14/2 romex to a j-box. The loads on each of the romexes would be less than an amp. Any input would be greatly appreciated. Thanks!

 

[Charlie Bob]

it's not ilegal if that 's your question.
Now if this is underground, UF should be used.

 

[augie47]

Not that it's not done every day, but if you look at Note 9 of Chapter 9 Tables (pg 671 in '08) you will see the 3/4" PVC is most likely nowhere near the required size.
A bigger question is where will this PVC be installed ? (Indoor, outdoor, etc.)

 

[romeo]

Romex in conduit question???

it's not ilegal if that 's your question.
Now if this is underground, UF should be used.

If it is underground, UF or other conductors with insulation listed for wet locations MUST be used.

 

[glene77is]

We have used Romex run through both RNC and EMT.
All applications were in DRY locations.
All ends of the conduit were bushed.
Passed inspection repeatedly.

Romex cable covering was intact until inside the junction box,
where a transition joint was made.

From the code I read, the Romex sheathing must remain INTACT.
The 'rated as' labeling is stamped on the sheathing,
not stamped on the conductors.
We could NOT establish that the conductors were THHN,
because the manufacturer 'Listed' the entire cable assembly.
Transition to THHN was done in a junction box, per code.

When pulling runs in a sub-paneled residential garage,
or runs in a sub-paneled basement,
we pull Romex from the load center, across the joists,
and into EMT for the drop down the cement block wall.
We use bushings as the Romex enters the EMT,
and pull the Romex (with sheathing intact) into the junction box.

 

[infinity]

In dry locations you can install NM cable in a conduit. Take a look at Chapter 9. If this is a sleeve for protection from physical damage then the percentages in Chapter 9 Table 1 do not apply (note (2)). For a conduit system you would need to look at the requirments of note (9).

 

[jango]

More info guys: The PVC conduit is buried underground below an open storage structure with a roof. Does this change the requirements?

 

[infinity]

More info guys: The PVC conduit is buried underground below an open storage structure with a roof. Does this change the requirements?

Yes, take a look at the definition of Location, Wet in article 100.

 

[Power Tech]

I do not understand why you do not terminate the PVC in a box and pull the correct wire?

 

[glene77is]

I do not understand why you do not terminate the PVC in a box and pull the correct wire?

Power,

I don't understand your use of 'correct wire'.

Sometimes it is cheaper (time & material wise) and meets code,
to simply push it down a conduit and into the JB,
then connect the Receptical, directly onto the Romex.

 

[Dennis Alwon]

I think the point here is that if this is a complete raceway then why use a cable assembly? Why not use thwn wire? If it is a sleeve then UF must be used since it is underground and I seriously doubt you can get a 14/3 zuf along with a 14/2 uf in the 3/4" conduit--it will be tight to say the least.

 

[Cavie]

By "correct wire" he is refering to a j-box and changing to THWN in the PVC "wet location".

 

[iwire]

By "correct wire" he is referring to a j-box and changing to THWN in the PVC "wet location".

And I, like Glen are asking why is that the 'correct wire'?

NM or UF in wet locations are not 'incorrect wires'

 

[jumper]

The OP says 3/4" conduit, I used a diameter of .5" for the two cables and come up with needing a 1 1/4" conduit.

 

[Dennis Alwon]

The OP says 3/4" conduit, I used a diameter of .5" for the two cables and come up with needing a 1 1/4" conduit.

Let's not forget that Table 1 only applies to complete conduit or tubing systems.

Notes to Tables
(1) See Annex C for the maximum number of conductors and fixture wires, all of the same size (total cross-sectional area including insulation) permitted in trade sizes of the applicable conduit or tubing.
(2) Table 1 applies only to complete conduit or tubing systems and is not intended to apply to sections of conduit or tubing used to protect exposed wiring from physical damage. ........

 

[jumper]

Let's not forget that Table 1 only applies to complete conduit or tubing systems.

Yes, you are correct. However the OP states:

"I have a scenario where I have about 30' of 3/4" PVC conduit and I need to pull a 14/3 and a 14/2 romex to a j-box. The PVC conduit is buried underground below an open storage structure with a roof."

IMHO, this does not describe a protective sleeve.

 

[Dennis Alwon]

Yes, you are correct. However the OP states:

"I have a scenario where I have about 30' of 3/4" PVC conduit and I need to pull a 14/3 and a 14/2 romex to a j-box. The PVC conduit is buried underground below an open storage structure with a roof."

IMHO, this does not describe a protective sleeve.

My point is that giving the info we were given one cannot be sure. I can easily see this being done as a sleeve or a complete raceway. Start off in the crawlspace with UF and then sleeve underground to another building terminated in a jb. --- Who knows????

 

[jumper]

My point is that giving the info we were given one cannot be sure. I can easily see this being done as a sleeve or a complete raceway. Start off in the crawlspace with UF and then sleeve underground to another building terminated in a jb. --- Who knows????

Yeah, you are right.

 

[augie47]

--- Who knows????

The shadow...... (that definitely should show MY age)

 

[jumper]

The shadow......

"Who knows what evil lurks in the hearts of men? The Shadow knows!"
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