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Wednesday, October 1, 2014
Question:
Re: CQD published Friday, September 5, 2014
The use of glue on PVC box connectors or gluing into a box provided PVC connector with ENT is probably a violation of the UL listing of this raceway and that would make the installation a violation of NEC.
Cordially, Bill Nolte,
Charlie, Thanks for all your great work.
On Sept 4th a guy asked a question in part about using Blue ENT with Carlon products by gluing them together. Much as one would assemble PVC. I have done this coming in from a PVC 3/4'" run for a Pool to an LB then to 3/4 ENT and it works great to give me a continuous 3/4 run to the panel, but flexible. Is there any reason it wouldn't be allowed. ENT glued to Carlon products?
Thanks, Don Hartley
Charlie,
I think Mr. Dowdy was also concerned with the use of PVC cement being used to connect/secure the ENT to the PVC floor box. The NEC does not address this application except through Section 110.3(B). However, in addition to the manufacturer's installation instructions, one should look at the UL White Book under UL Product Category FKHU (ELECTRICAL NONMETALLIC TUBING) where the following information is located;
Fittings — The outside diameters of ENT are such that standard connectors, couplings and outlet boxes for rigid PVC conduit can be employed for ENT that is also constructed of PVC. Installation instructions are provided with each bundle or coil of ENT outlining the procedure to be used when employing cemented-on PVC conduit fittings and outlet boxes. These techniques include the specific cement to be used as well as its application method.
Keep up the GREAT job, I enjoy reading CQD.
Jeff Fecteau, Senior Regulatory Engineer, UL LLC
A
Answer:
Hi Guys, thanks for adding to the question and answer.
My initial answer was based on a mental image of a blue box rated for use encased in concrete with integral connectors. You can see an example at the Thomas & Betts website [TnB.com] under the Carlon brand name, ENT Systems, Boxes and Accessories.
Jeff thanks for providing the specific UL White Book information. It can be found at www.ul.com/whitebook