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Rigid Metal Conduit/Expansion Fittings? #103495
08/30/02 12:56 PM
08/30/02 12:56 PM
Joe Tedesco  Offline OP
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
[Linked Image]

Question: Are these fittings at the lower left permitted to be encased in poured concrete?


[This message has been edited by Joe Tedesco (edited 09-02-2002).]


Joe Tedesco, NEC Consultant
2017 / 2014 NEC & Related Books and Study Guides
Re: Rigid Metal Conduit/Expansion Fittings? #103496
08/30/02 03:53 PM
08/30/02 03:53 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Joe,
That could be a Crouse Hinds type XD, Expansion/Deflection Coupling. If so the catalog says that they are suitable for use embedded in concrete. I think that other companies have similar products.
Don


Don(resqcapt19)
Re: Rigid Metal Conduit/Expansion Fittings? #103497
08/30/02 04:15 PM
08/30/02 04:15 PM
Joe Tedesco  Offline OP
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Don: Thanks, I found this on the TradeSlang Site.

Description

Expansion Deflection couplings (joints) are fittings that allow for 3/4" movement in any direction between two pieces of Rigid, IMC or PVC conduit.

The deflection term comes from its ability to bend up to 30 degrees. They are typically used when the conduit has to withstand vibration from machinery or vehicles.

Made by Crouse-Hinds, OZ Gedney and others, they come in sizes ranging from 1/2" to 6".



[This message has been edited by Joe Tedesco (edited 09-02-2002).]


Joe Tedesco, NEC Consultant
Re: Rigid Metal Conduit/Expansion Fittings? #103498
08/30/02 05:04 PM
08/30/02 05:04 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Joe,
Were they used in this case to correct a misalignment between the sections of conduit?
Don


Don(resqcapt19)
Re: Rigid Metal Conduit/Expansion Fittings? #103499
08/30/02 05:16 PM
08/30/02 05:16 PM
Joe Tedesco  Offline OP
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
No, I suppose they were installed because of the expected vibration from vehicles.


Joe Tedesco, NEC Consultant
Re: Rigid Metal Conduit/Expansion Fittings? #103500
09/15/02 07:10 AM
09/15/02 07:10 AM
T
tsolanto  Offline
Member
Joined: Sep 2002
Posts: 131
Long Island NY
I was at at Yankee Stadium last week and as I was passing the train tressel when I noticed what looked like the connectors in your pictures. It appears that they were used to absorb vibration from the trains.


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