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#102890 - 11/17/01 08:04 AM Does the 2002 NEC prohibit this?
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
A rigid conduit threadless coupling. The 2002 NEC now prohibits this type of connection.

[This message has been edited by Joe Tedesco (edited 03-13-2005).]
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#102891 - 11/17/01 02:23 PM Re: Does the 2002 NEC prohibit this?
Tom Offline
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Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
Joe,

I'm a little tardy getting my new codebook, but I can gaurantee the '99 code prohibits this.

The people that see this everday probably think that it is relatively safe because the gap is so small that the wires aren't likely to be damaged. Little do they realize that the metal raceway is usually the only equipment ground & there is the possibility of a serious hazard downstream of this fitting.
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#102892 - 11/17/01 06:27 PM Re: Does the 2002 NEC prohibit this?
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
Tom: When you get your 2002 NEC read the following, and see the new last sentence.
For IMC -- 342.42 Couplings and Connectors.
(A) Threadless. Threadless couplings and connectors used with conduit shall be made tight. Where buried in masonry or concrete, they shall be the concretetight type. Where installed in wet locations, they shall be the raintight type. Threadless couplings and connectors shall not be used on threaded conduit ends unless listed for the purpose.

For RMC -- 344.42 Couplings and Connectors.
(A) Threadless. Threadless couplings and connectors used with conduit shall be made tight. Where buried in masonry or concrete, they shall be the concretetight type. Where installed in wet locations, they shall be the raintight type. Threadless couplings and connectors shall not be used on threaded conduit ends unless listed for the purpose.
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#102893 - 11/17/01 09:02 PM Re: Does the 2002 NEC prohibit this?
Bill Addiss Offline
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Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Joe,

This was not prohibited before?

Bill

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#102894 - 11/18/01 05:49 AM Re: Does the 2002 NEC prohibit this?
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
Bill:

The last sentence is new in both sections, so that situation was not considered before the 2002 NEC. I found that the sentence is missing in the RMC article in my copy of the 2002 NEC, and the vertical rule is also missing in the IMC article. In addition the NEC CD Master PDF file is with the vertical rule in one section, but not in the other because of missing words.

I expect that we will see errata sheets on this soon from NFPA.

In the meantime I now have my copy of the NFC Fire Codes update CD and the corrections were made.


As far as the actual situation, this was found on a parking lot surface and the subject of EGC came to mind and the fact that the fitting was not designed to be used this way, and there were tripping hazards as well. Tom's points are well taken and it would violate 300.10.



[This message has been edited by Joe Tedesco (edited 11-18-2001).]
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#102895 - 11/18/01 07:09 AM Re: Does the 2002 NEC prohibit this?
motor-T Offline
Member

Registered: 11/10/01
Posts: 293
Loc: Girard, Ohio, USA
Bill;
Isnt that a emt coupling on rigid conduit ?
Didnt it have to be listed for the material used and approved for its use ?
It would be approved for emt because when you tighten it you dimple the emt helping to prevent it separation. Where with ridgid or imc it would be almost impossible to put that dimple in it.
Just asking ?

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#102896 - 11/19/01 04:10 AM Re: Does the 2002 NEC prohibit this?
Redsy Offline
Member

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
motor-T,

Set screw and compression fittings are available for rigid & IMC. Check out a Crouse-Hinds catalog.

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#102897 - 11/19/01 05:26 AM Re: Does the 2002 NEC prohibit this?
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Joe,

It seems that we've got 2 issues going with this one. I was questioning the use of a set screw coupling in a wet location.


Bill

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#102898 - 11/19/01 05:33 AM Re: Does the 2002 NEC prohibit this?
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
Bill:

Both 2002 NEC and earlier rules indicate permitted use of threadless fittings in a wet location when they are of the raintight type.

The point I want to make is that the "new code" will not allow them to be used on threaded conduit ends unless they are listed for the purpose.

So now we should see a new product that will be listed.
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#102899 - 11/19/01 05:46 AM Re: Does the 2002 NEC prohibit this?
Redsy Offline
Member

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
Crouse-Hinds SSR series set-screw fittings for Rigid & IMC are concrete & rain tight. I don't believe they are acceptable on threaded ends. Page 9F-6 of the 2000 catalog.

(No, I don't work for CH)

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