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Joined: Oct 2000
Posts: 2,749
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See 300.6(A)(3)where this is a new requirement that would allow the special tape to be used.

I am looking for the product that we use.


Joe Tedesco, NEC Consultant
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Joined: Jul 2004
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G
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I don't see the word "tape" used. 300.6(A) says "electrically conductive corrosion resistant compound" and "corrosion resistant material" (usually galvanizing).
I think plastic is rapidly making metal obsolete wherever it can be used.
How many people here actually "pot" the exposed threads of IMC and RMC?


Greg Fretwell
Joined: Jul 2004
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This is what steelconduit.org says about it
"14.Factory cut threads have corrosion protection applied at the factory. Field cut threads are required to be coated "with an approved electrically conductive, corrosion-resistant compound "where corrosion protection is necessary " (see NECĀ® 2002 300.6 (A). We recommend that all field cut threads be protected against corrosion where they will be installed in wet or outdoor locations. The thread surface should be protected with conductive rust resistant coating. Zinc-rich paint is a typical coating, but there are other conductive coatings that can be used.

Field threads should be cut one thread short. This will insure a good connection and allow the entire thread surface to be inside the coupling."


Greg Fretwell
Joined: Aug 2003
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I am told that 3M makes a product listed for this application, but I haven't seen it.


Ryan Jackson,
Salt Lake City
Joined: Jul 2004
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G
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Ryan, do you mean this stuff?
http://products3.3m.com/catalog/us/...e/gvel_LJLFLP2Q4Dgl/theme_us_electricalc ontractors_3_0/command_AbcPageHandler/output_html

I don't see any reference to a U/L listingh although there are several ASTM standards referenced in the PDF

(to open link copy and paste into address bar then close space between the "a" and "c" in us_electicalcontractors)

[This message has been edited by Webmaster (edited 01-19-2005).]


Greg Fretwell
Joined: Oct 2000
Posts: 2,749
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I tried to fine the tape but could not decide which one was typically used.
http://www.3m.com/product/t_index/t_index.jhtml


Joe Tedesco, NEC Consultant
Joined: Oct 2000
Posts: 2,749
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Joe Tedesco, NEC Consultant
Joined: Jul 2004
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G
Member
Joe, did you see a U/L listing for that tape. I couldn't find one


Greg Fretwell
Joined: Aug 2003
Posts: 1,374
R
Moderator
My apologies, I was thinking the reference required a listing, but it only requires "approval".

I did hear that there was something listed for this, however. I'll see if I can find out more.


Ryan Jackson,
Salt Lake City
Joined: Jul 2004
Posts: 9,711
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G
Member
If you believe the steel conduit folks they say their product is OK without any extra protection.
I don't believe them with EMT but RMC seems to hold up, even here in the swamp. I dug some up that has been in the ground since 1963 and it was OK.


Greg Fretwell
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