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Joined: Oct 2004
Posts: 265
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We did a job replacing a ton of conduit on a buildings roof a couple years back. Inspector tagged us for not using the newly approved RT connectors. We ordered some and redid all the work. He then retags us saying his town only allows one manufacture of RT fittings. So we redid the work again =\ Now there are several manufactures that inspectors around here will accept, was just a fustrating learning process for us. You can tell the difference between the fittings, the approved ones have colored plastic bushings everywhere. Also you can tell the difference when you get the price for the new ones
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Joined: Oct 2004
Posts: 265
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Shhh resqcapt19, don't give UL any ideas! They might remove rigid's aproval as RT!
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Joined: May 2003
Posts: 2,876
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Don, My rigid connections are greased, and tight, bone dry in there. Some grease, Corroision-X, or Noalox and a 2' handle chain wrench will help to get it tight enough to run gas through, not that you would.
Just thought of something, do they make "New" Treadless RMC connectors and couplings with gaskets on them too?
Mark Heller "Well - I oughta....." -Jackie Gleason
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Joined: Jul 2004
Posts: 9,931 Likes: 34
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What does a rain tight MC fitting look like? How do you keep the water out of the MC cable?
Greg Fretwell
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Joined: May 2003
Posts: 2,876
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gfretwell, RMC/Rigid Metalic Conduit, there was an "R" in there.... If thats what you mean?
Mark Heller "Well - I oughta....." -Jackie Gleason
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Joined: Jul 2004
Posts: 9,931 Likes: 34
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No not RMC, MC. MC cable is usually labelled wet or dry. What type of connector do you use if you are a fanatic about the rain tight thing?
Greg Fretwell
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Joined: May 2003
Posts: 2,876
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MC in the rain.......... Sounds like a bad idea.
Mark Heller "Well - I oughta....." -Jackie Gleason
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Joined: Jul 2004
Posts: 9,931 Likes: 34
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You may not like it but 330.10(A)(12) In wet locations where any of the following conditions are met: a. The metallic covering is impervious to moisture. b. A lead sheath or moisture-impervious jacket is provided under the metal covering. c. The insulated conductors under the metallic covering are listed for use in wet locations.
I am looking at a box of aluminum wound Southwire EZ-MC that says it has THWN conductors suitable for wet locations.
My question, with what rain tight connector? You seen one? How does it stop the water inside the MC cable?
Greg Fretwell
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Joined: Nov 2000
Posts: 2,148
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e57, Conduit couplings are straight thread, and do not seal even when made up wrench tight. A compound such as required by 300.6(A) may help, but it is my opinion that rigid conduit couplings are less raintight than the old EMT couplings. I think that our couplings should have tapered thread like the plumbers couplings do. This would make them more water tight and provide a better fault clearing path. Don
Don(resqcapt19)
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Joined: Oct 2000
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Joe Tedesco, NEC Consultant
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Posts: 43
Joined: September 2013
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