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#85515 07/12/03 07:46 AM
Joined: Dec 2000
Posts: 4,294
Member
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
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
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
Joined: Sep 2001
Posts: 806
N
Member
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
Joined: May 2002
Posts: 1,716
R
Member
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
Joined: Apr 2002
Posts: 2,527
B
Moderator
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
Joined: Dec 2000
Posts: 4,294
Member
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
Joined: Apr 2002
Posts: 2,527
B
Moderator
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
Joined: Aug 2002
Posts: 1,081
T
Member
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
Joined: May 2002
Posts: 1,716
R
Member
Go here for UL's report.
http://www.ul.com/regulators/raintight.html

Roger

#85524 07/14/03 09:59 AM
Joined: Jul 2001
Posts: 599
J
JBD Offline
Member
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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