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#85515 - 07/12/03 07:46 AM Raintight EMT  
electure  Offline


Member
Joined: Dec 2000
Posts: 4,259
Fullerton, CA USA
I've just found out that EMT compression fittings, which I've always considered to be "raintight," aren't listed for that use at this time.
Has anyone stopped using them for this purpose???...S


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#85516 - 07/12/03 09:56 AM Re: Raintight EMT  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
Not me. What are we supposed to do, use GRC or make an ugly looking PVC installation?

I've torn out quite a few outdoor EMT installations & I don't recall seeing any evidence that the connectors & couplings leaked. Of course, one man's experience is limited & this could be a real problem elsewhere.


Few things are harder to put up with than the annoyance of a good example.

#85517 - 07/12/03 11:16 AM Re: Raintight EMT  
NJwirenut  Offline
Member
Joined: Sep 2001
Posts: 806
Bergen County, NJ
I use them outdoors, as well, and have never had a problem or been red-tagged by an inspector for it.

On a vertical run (like a service riser), I will often smear a bit of RTV around the top compression nut as added insurance against leaks.


#85518 - 07/12/03 11:55 AM Re: Raintight EMT  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Since this came about, I have wondered what caused UL to rescind it's original listing of these fittings. It seems like this could be a credibility awakening for some of their other listings. [Linked Image]

I mean, why did this just happen out of the blue, did they decide they had low water pressure the day they originally tested these way back when? [Linked Image]

Roger


#85519 - 07/12/03 03:17 PM Re: Raintight EMT  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
This may be old information, but http://tnbelectricalworld.tnb.com/contractor/docs/tbhazardous.pdf seems to call out raintight up to 2 inch, but a few other catalogs do not.

2½-4 inch compression-ring EMT fittings have generally not been raintight listed. A notable exception were fittings for 2½-4 inch EMT so marked, and furnished with a plainly visible rubber boot.

There are a number of ‘raintight’ hits in http://www.steelconduit.org/pdf/ConGuide4.3.pdf


#85520 - 07/12/03 09:09 PM Re: Raintight EMT  
electure  Offline


Member
Joined: Dec 2000
Posts: 4,259
Fullerton, CA USA
Bjarney, Currently UL does not list any EMT fittings as raintight..Looks like we're all in a heck of a lot of trouble.
This is ridiculous. Failures are generally caused in the terminations...S


#85521 - 07/12/03 09:29 PM Re: Raintight EMT  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
I agree with Tom. PVC can get pretty seedy looking outside on a building surface.

Don't "W-" and "W-2"-rated conductors buy you anything used outdoors?


#85522 - 07/12/03 10:59 PM Re: Raintight EMT  
ThinkGood  Offline
Member
Joined: Aug 2002
Posts: 1,081
Milwaukee, WI
Quote
Currently UL does not list any EMT fittings as raintight


I thought EMT was not listed for outdoor use--only "rigid" conduit?


#85523 - 07/13/03 09:32 AM Re: Raintight EMT  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Go here for UL's report.
http://www.ul.com/regulators/raintight.html

Roger


#85524 - 07/14/03 09:59 AM Re: Raintight EMT  
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
Does any one know what part of the connector failed? The connector to box? or the connector to conduit?

Thomas and Betts technical support said that the use of a seperate sealing washer would be suffcient to meet the raintight requirements.


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