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Old 05-07-2011, 08:35 PM   #1
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Transition from PVC conduit to LFNC-B


For a 40A pool feeder, I need to transition from 1 1/4" schedule 40 PVC outdoors/underground to 3/4" Carflex LFNC-B in the basement ceiling joists. The least painful way to do it seems to be cementing the 1 1/4" LB fitting to a 1 1/4" - 1" adapter, to a 1" -3/4" adapter, to the 3/4" flex conduit and running the 3/4" through the exterior wall.

Picture of the proposed kludge attached. Is this allowed?

Thanks,

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Old 05-07-2011, 08:50 PM   #2
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Transition from PVC conduit to LFNC-B


A. You will not find a listing allowing cementing Carflex in to a PVC fitting.
B. While it can be done it will be tough to pull a 40 amp feeder circuit into 3/4" Carflex
C. You could stub a short piece of 3/4" pvc through the wall and then attach a 3/4" female adapter to the pipe then use the proper Carflex fitting into the adapter.

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Last edited by brric; 05-07-2011 at 08:59 PM.
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Old 05-07-2011, 08:59 PM   #3
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Transition from PVC conduit to LFNC-B


Agreed, pulling the conductors will be interesting. By "You will not find a listing", do you mean that it violates code, or that this just isn't the best way to do it?
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Old 05-07-2011, 09:02 PM   #4
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Transition from PVC conduit to LFNC-B


The manufacturer has not applied for or gotten a listing for that method of using their product.
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Old 05-07-2011, 09:18 PM   #5
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Transition from PVC conduit to LFNC-B


Thank you! I substituted Googling for actual knowledge and found http://www.electriciantalk.com/f5/ca...-urgent-20089/ , but I didn't know what an "FA" was...

Edit: Kludge violates 356.6 ("LFNC and associated fittings shall be listed"), but some AHJs pass it anyway.

Edit 2: Carlon specifically states that their LFNC shouldn't be cemented - http://www.carlon.com/FAQs/FAQ-Liquidtight.pdf

Last edited by Simbilis; 05-08-2011 at 02:42 AM.
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Old 05-07-2011, 11:02 PM   #6
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Transition from PVC conduit to LFNC-B


I have no idea what an "FA" is referring to either and I do this for a living.


get a proper connector for the nmfc and then a reducing bushing to glue into the LB with threads to accept the nmfc connector.
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Old 05-08-2011, 12:40 AM   #7
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Transition from PVC conduit to LFNC-B


Female Adapter, must be local slang term for a flex connector.

My advise is a flex FA and a RGC threaded coupling and a PVC MA.(male adapter)

And not listed means code violation, because code says it must be listed.
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Old 05-08-2011, 07:03 AM   #8
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Transition from PVC conduit to LFNC-B


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Originally Posted by Saturday Cowboy View Post
Female Adapter, must be local slang term for a flex connector.

My advise is a flex FA and a RGC threaded coupling and a PVC MA.(male adapter)

And not listed means code violation, because code says it must be listed.
no. a female adapter (duh!!) is the piece the fits into the lb and has threads (female) for a connector. It is the reducing bushing I spoke of in my response. It's proper term would be a female adapter. a reducing bushing typically has the same type of connection (threaded or a glue fitting) on both the inside and outside. My error there)

as I said, all he needs is a FA of proper size (May have to use a reducing bushing as well as a FA if a 1 1/4 to 3/4" fa cannot be sourced) and a FNMC connector. Why is everybody making this so difficult?
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Old 05-08-2011, 06:25 PM   #9
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Transition from PVC conduit to LFNC-B


Here's how it ended up. Reducer bushings installed, 3/4 PVC and a female adapter ready.

Thanks again
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Old 05-08-2011, 07:48 PM   #10
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and of course you did purchase a proper connector for the end of the FNMC, right?
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Old 05-08-2011, 07:54 PM   #11
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Transition from PVC conduit to LFNC-B


Quote:
Originally Posted by Saturday Cowboy View Post
....And not listed means code violation, because code says it must be listed.
Where does the Code say this?
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Old 05-08-2011, 08:16 PM   #12
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Quote:
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and of course you did purchase a proper connector for the end of the FNMC, right?
Yep, I already had a couple on hand.

Quote:
Originally Posted by kbsparky View Post
Where does the Code say this?
356.6 - LFNC and associated fittings shall be listed

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