proper fittings

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Gentry Muse

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I was recently turned down on an inspection. I was running MC cable to a conduit in a wall. I used an emt compression fitting followed by a rigid coupling to a threaded re fitting and a mc connector. I was first told that was too many fittings. Then I was told that the rigid coupling was not a proper fitting for this application. I have seen this in a lot of places. If this isn't the right application, then how can you change over to say EMT to greenfield or sealtite? I guess my question is where does it say in the code a rigid fittings are a proper fitting
 
Gentry Muse said:
I was recently turned down on an inspection. I was running MC cable to a conduit in a wall. I used an emt compression fitting followed by a rigid coupling to a threaded re fitting and a mc connector. I was first told that was too many fittings. Then I was told that the rigid coupling was not a proper fitting for this application. I have seen this in a lot of places. If this isn't the right application, then how can you change over to say EMT to greenfield or sealtite? I guess my question is where does it say in the code a rigid fittings are a proper fitting
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I have done that myself before, but they do make fittings to go from emt directly to greenfield, I dont know about sealtite...
 
John Arendt said:
Usual reason is 110-3 (b), or unlisted connector/fitting.
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roger that - they make a listed changeover fitting, which is "technically correct" for the two wiring methods
 
Gentry, As I understand it, the threads in a ridged coupling are cut straight

not tapered. The fittings used are made for tapered connections only. Sorry,

I don't know the code article, but this has been discussed on the Forum before.
 
Gentry Muse said:
If this isn't the right application, then how can you change over to say EMT to greenfield or sealtite?
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A junction Box?

I have made "changeovers" exactly as you described in your post. I think most of us have.

Joe
 
John Arendt said:
Usual reason is 110-3 (b), or unlisted connector/fitting.
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John,

As I stated above I am guilty of this same installation. I have heard that this is not correct and have been directed to 110.3(B) but I have not been able to find this in the UL white book. Am I looking in the right place?


Joe
 
That don't even make change over fittings larger than 1.5" so what are you supposed to do when you have large FMC? It seems to me that if you're using a coupling to couple together FMC and pipe there shouldn't be a problem. The thread issue really shouldn't matter because the edge of the connectors is made up wrench tight against the coupling.
 
Joebell:
UL White Book. Basically, some AHJ's say that the fitting has to be 'listed' for the use. It's an argument/discussion that will continue forever.

Infinity:
I know where you are coming from....but....a 'pipe coupling' by definition (mfg) is made to couple lengths of pipe. I'm NOT arguing the issue. I have 40 years in the trade....and I have used pipe couplings and fittings as described within. (Guilty as charged) It's becoming a real CYA situation.
BTW, your ? re: over 1.5" was "use a properly sized box". NOT my argument.
 
wireman71 said:
Tell this "inspector" to give you a code violation in writing or go pound sand.
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I can see you really know how to make friends.


My advice is to ask the inspector if he can provide you with a code section(s) so you can learn from his inspection. I provide a code section or reference to the UL White Book pretty much for each and every inspection, whether it passes or not, every day.


I have had guys call me up later to discuss my decision, this generally leads to a lively discussion which helps to make both of us think a little harder about the topic.
 
This is a very common practice and I have never seen it knocked down durring an inspection yet if you wanted to knitpick it it could probably be knocked down. Do I believe it is unsafe?? Not for one second.
 
Use the next larger size of rigid coupling and put a reducing bushing into each end. That will solve the itty bitty thread taper problem for your emt and sealtite connections. Then buy your inspector that bottle of Chivas Regal that he really is after.
 
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