EMT in wet locations

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ron said:
225.22 Raceways on Exterior Surfaces of Buildings or Other Structures
230.53 Raceways to Drain
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I am not referring to the draining of raceways but the use of RT fittings. Don says they are not necessary and I may agree but the code still requires it.
 
May or may not have been a code change, the bigger change is someone decided those old style compression fittings were not raintight and developed what now is called raintight and a listing standard was likely also developed. NEC may have changed slightly to re-iterate this but really should have been already covered by 110.3(B).
 
kwired said:
May or may not have been a code change, the bigger change is someone decided those old style compression fittings were not raintight and developed what now is called raintight and a listing standard was likely also developed. NEC may have changed slightly to re-iterate this but really should have been already covered by 110.3(B).
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Yes, I think that you are correct, it was not a code change but a listing standard change, but I stand by my statement that the old compression couplings do not leak any more than a thread coupling does. Why is this only an issue for EMT?
 
don_resqcapt19 said:
Yes, I think that you are correct, it was not a code change but a listing standard change, but I stand by my statement that the old compression couplings do not leak any more than a thread coupling does. Why is this only an issue for EMT?
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Yes, but does a RT fitting for the EMT work better than a compression fitting for EMT? That is the real question. Put some tar on the rigid couplings and your good to go. LOL
 
don_resqcapt19 said:
Yes, I think that you are correct, it was not a code change but a listing standard change, but I stand by my statement that the old compression couplings do not leak any more than a thread coupling does. Why is this only an issue for EMT?
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Because the EMT couplings sell more than the thread less RMC coupling. :happyyes:
 
Dennis Alwon said:
Yes, but does a RT fitting for the EMT work better than a compression fitting for EMT? That is the real question. Put some tar on the rigid couplings and your good to go. LOL
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I have no idea if the RT works better, I have never even seen on, let alone used one.
 
ActionDave said:
They are a PIA, and I am not one to use that phrase casually.
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Second time tonight I'm agreeing with you. I usually end up taking them all the way apart just to put the individual pieces on the end of the pipe one at a time before inserting it into the coupling/conn. What a complete waste of time...
 
Cow said:
Second time tonight I'm agreeing with you. I usually end up taking them all the way apart just to put the individual pieces on the end of the pipe one at a time before inserting it into the coupling/conn. What a complete waste of time...
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Yeah, I hate that green plastic ring.
 
don_resqcapt19 said:
Yes, I think that you are correct, it was not a code change but a listing standard change, but I stand by my statement that the old compression couplings do not leak any more than a thread coupling does. Why is this only an issue for EMT?
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Same reason AFCI's were forced into the code - manufacturers wanted to sell products. Though not specifically a code issue, but listing issues are nearly equal as codes when it comes to such usage of a product.

don_resqcapt19 said:
I was not even thinking of a threadless coupling. The threaded ones leak.
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Better hope no conduit manufacturing reps are reading, or we will need listed RT threaded couplings in the near future:roll:

don_resqcapt19 said:
I have no idea if the RT works better, I have never even seen on, let alone used one.
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I run a lot of EMT on grain storage bins, as well as RMC/IMC. Condensation is a much bigger issue then what leakage you may get through fittings. Have many times run some raceway, come back to pull conductors a day or so later and there is water in bottom of enclosures in the run even though it never rained, this is from condensation and happens almost daily possibly putting more water within the raceway system then if one had used set screw fittings and considered how much leakage they would allow in rainy conditions. The additional sealing glands they put in a RT fitting are usually a hard nylon piece, that is difficult to get the tube into without taking the fitting apart and sliding it on individually. Now try to assemble it in cold weather - not even extreme cold and sometimes they just don't want to go on at all. Use excess force to just shove the tube in the fitting and hope it goes correctly and you often end up splitting this nylon piece. Nothing but a pain. They also come with a gasket to seat against the enclosure - those often push out from the connector to enclosure contact point and end up not sealing anyway:thumbsdown:
 
kwired said:
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Better hope no conduit manufacturing reps are reading, or we will need listed RT threaded couplings in the near future:roll:
...
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A number of years ago, the Canadian code required rigid conduit couplings with tapered threads just like plumbing couplings. After they changed to straight thread couplings, one of the complaints that the conduit manufactuters got was that the new couplings leak. It was the conduit manufacturers that wanted the straight thread couplings as they are much cheaper to manufacture.
 
Im curios . Whst application would someone use emt iver pvc if depth can be reached and if not ridged . I have never buried emt.. I probably believed it was not weather or galvanized for it. Elt if thats like a fence post would seem to be a better choice.. does this mean it can be ran in concrete as well?
 
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