ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Broken Outlet & Dangling Light
by LoneWolf - 06/14/21 08:21 PM
How's all our Non-US folks doing?
by C-H - 06/14/21 05:42 PM
Where is Everyone?
by Bill Addiss - 06/14/21 12:37 PM
Conduit over Vinyl Siding
by Bill Addiss - 06/14/21 12:35 PM
Switched Receptacles -Top or Bottom?
by Bill Addiss - 06/14/21 12:25 PM
New in the Gallery:
2020 - 2021 Winter Project
2020 - 2021 Winter Project
by Bill Addiss, April 29
Garden 2021
Garden 2021
by Bill Addiss, April 26
Who's Online Now
0 members (), 44 guests, and 19 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#92292 03/12/05 09:15 AM
Joined: Jan 2004
Posts: 1,507
G
Member
Inspected a job where the manufacturer built walls in the factory and installed non metallic boxes and smurf tubing inside the walls and styrafoam (spelling) insulation. Walls are sealed up and now he wants the electrical contractor to pull in NM cable for the wiring method. My understanding is that this would violate the code. NM cable is not Listed for use in ENT. I believe the contractor should be using single conductors. What does this forum think?


George Little
2017 / 2014 NEC & Related Books and Study Guides
#92293 03/12/05 09:30 AM
Joined: Jun 2004
Posts: 613
S
Member
NM is not approved for installation as you have described only for the reason that a approved cable connector will not be used at the point where it enters the box.

Code violation...yes.

Hazard to people and property...no.

shortcircuit

#92294 03/12/05 10:51 AM
Joined: Mar 2001
Posts: 2,056
R
Member
In addition to support issues described by sc, the width of the NM cable would have to be considered in order to satisfy raceway fill, per "Notes to Tables" in Chapter 9.
What size tubing? What size NM?
In my opinion, it seems amateurish to attampt to install romex in raceways.
Single conductors is the proper way to go.

[This message has been edited by Redsy (edited 03-12-2005).]

#92295 03/12/05 04:13 PM
Joined: May 2002
Posts: 1,716
R
Member
The 2005 clears this up and it is allowed. It was never really the intent that NM was not allowed in raceways, but I won't dwell there.

Article 362.22 (all the xxx.22 sections are the same)

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

#92296 03/12/05 04:33 PM
Joined: Dec 2003
Posts: 886
H
Member
Depends on the runs. I'm going to assume that they are stubbed up into the ceiling space at the top. I think the main issue is going to be the transition from NM to the tubing with the connector requiremment. I don't believe that you can put an adaptor and NM connector on the end of the tubing because it needs to be accessable. This would mean extending the tubing to an accessable J box. This would also mean that there would be no reason to pull NM but rather single conductors as necessary.

-Hal

#92297 03/12/05 07:22 PM
Joined: Mar 2001
Posts: 2,056
R
Member
I agree with Roger as to intent.
After all, adapter fittings to connect NM to EMT have been around for a long time. But, the issue has been debated several times, with the "securing the cable" argument probably being the most compelling reason not to do it.

#92298 03/12/05 08:49 PM
Joined: Jun 2001
Posts: 642
N
Member
I do not see the problem with romex in a raceway if the raceway is appropatly sized.

Last sentence of 334.30 2005 code
" Sections of cable protected from physical damage by raceway shall not be required to be secured within the raceway."

If the romex is in a raceway and the raceway terminates correctly in a box, why not use it.

While I personally would probably use an acessable J box in an attic or unfinished basement and THHN, it appears to be nothing wrong code wise with using romex this way.

[This message has been edited by nesparky (edited 03-12-2005).]


ed

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
The_Lightman
The_Lightman
Orlando, Fl, USA
Posts: 49
Joined: August 2001
Top Posters(30 Days)
Admin 13
Trumpy 10
Popular Topics(Views)
280,356 Are you busy
213,431 Re: Forum
200,352 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5