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#98605 - 01/19/05 07:44 AM What type of tape can be used for this purpose.
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
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.
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#98606 - 01/19/05 09:59 AM Re: What type of tape can be used for this purpose.
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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?
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#98607 - 01/19/05 10:06 AM Re: What type of tape can be used for this purpose.
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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 NEC® 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."
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#98608 - 01/19/05 10:50 AM Re: What type of tape can be used for this purpose.
Ryan_J Offline
Moderator

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
I am told that 3M makes a product listed for this application, but I haven't seen it.
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Ryan Jackson,
Salt Lake City

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#98609 - 01/19/05 11:07 AM Re: What type of tape can be used for this purpose.
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
Ryan, do you mean this stuff?
http://products3.3m.com/catalog/us/en001..._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).]
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#98610 - 01/19/05 12:42 PM Re: What type of tape can be used for this purpose.
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
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
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#98611 - 01/19/05 01:14 PM Re: What type of tape can be used for this purpose.
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
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#98612 - 01/19/05 04:41 PM Re: What type of tape can be used for this purpose.
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
Joe, did you see a U/L listing for that tape. I couldn't find one
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Greg Fretwell

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#98613 - 01/19/05 06:22 PM Re: What type of tape can be used for this purpose.
Ryan_J Offline
Moderator

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
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.
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Ryan Jackson,
Salt Lake City

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#98614 - 01/19/05 06:52 PM Re: What type of tape can be used for this purpose.
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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.
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Greg Fretwell

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