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#85515 - 07/12/03 04:46 AM Raintight EMT
electure Offline


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Registered: 12/24/00
Posts: 4259
Loc: 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 06:56 AM Re: Raintight EMT
Tom Offline
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Registered: 01/01/01
Posts: 1044
Loc: 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.
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#85517 - 07/12/03 08:16 AM Re: Raintight EMT
NJwirenut Offline
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Registered: 09/15/01
Posts: 806
Loc: 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.
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#85518 - 07/12/03 08:55 AM Re: Raintight EMT
Roger Offline
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Registered: 05/18/02
Posts: 1716
Loc: 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.

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?

Roger
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#85519 - 07/12/03 12:17 PM Re: Raintight EMT
Bjarney Offline
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Registered: 04/10/02
Posts: 2527
Loc: 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
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#85520 - 07/12/03 06:09 PM Re: Raintight EMT
electure Offline


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Registered: 12/24/00
Posts: 4259
Loc: 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
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#85521 - 07/12/03 06:29 PM Re: Raintight EMT
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2527
Loc: 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?
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#85522 - 07/12/03 07:59 PM Re: Raintight EMT
ThinkGood Offline
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Registered: 08/07/02
Posts: 1081
Loc: 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?
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#85523 - 07/13/03 06:32 AM Re: Raintight EMT
Roger Offline
Member
Registered: 05/18/02
Posts: 1716
Loc: N.C.
Go here for UL's report.
http://www.ul.com/regulators/raintight.html

Roger
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#85524 - 07/14/03 06:59 AM Re: Raintight EMT
JBD Offline
Member
Registered: 07/12/01
Posts: 599
Loc: 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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