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#98577 - 06/02/06 05:26 AM EMT installation  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Question received by e-mail:

Quote
Can 3/4 emt be strap to bar joist with nylon tie wrap?


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#98578 - 06/02/06 07:13 AM Re: EMT installation  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
I would say it's possible to install 3/4" EMT in bar joist and secure it with plastic tyrap material. A lot would depend on the size of the tyraps and the frequency of the tying. There is not much in the NEC about this so the judgment of the inspector kicks in.


George Little

#98579 - 06/02/06 01:56 PM Re: EMT installation  
GalwayElectric  Offline
Member
Joined: Sep 2005
Posts: 14
Rutherford, NJ
A bar joist as in: http://www.intelicad.com/Joist.jpg

358.30 A - EMT shall be securly fastened in place.... Seems like an inspector could have a difference of opinion on that.

Are nylon tie wraps UL approved for such use? Fire rating, etc...?

Why not use the caddy's? http://www.erico.com/public/images_thm/products/FF-Electrical/NorthAmerica/0319.jpg


#98580 - 06/03/06 02:57 AM Re: EMT installation  
macmikeman  Offline
Member
Joined: Jul 2002
Posts: 717
Honolulu, Hawaii
This leads me to the next logical question. How about mc cable? What is the opinion of the minds here about strapping mc with tie wraps?. Just curious, because I am currently doing a job that way and haven't called in for rough inspection yet.


#98581 - 06/03/06 03:16 AM Re: EMT installation  
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
I don't see why not, and have done it a few times. Only in a pinch.... Not in an exposed cieling though. I would also metion that certain types are not rated for prolonged exposure to sunlight. And would fail over time.


Normally I use metal tie wire.


Mark Heller
"Well - I oughta....." -Jackie Gleason

#98582 - 06/03/06 08:33 AM Re: EMT installation  
GalwayElectric  Offline
Member
Joined: Sep 2005
Posts: 14
Rutherford, NJ
Quote

How about mc cable? What is the opinion of the minds here about strapping mc with tie wraps?.


330.30(A)- Type MC cable shall be supported and secured by staples, cable ties, hangers, or similiar fittings or other approved means designed and installed so as not to damage the cable.

Interesting how the code directly specifies the use of tie wraps as being ok and it doesnt'for EMT. EMT needs to be installed more securely anyway b/c of pulling the wire through and adding circuits, etc...,



[This message has been edited by GalwayElectric (edited 06-03-2006).]


#98583 - 06/03/06 09:24 AM Re: EMT installation  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
For what it is worth the supports for EMT and conduit are not generally required to be listed. If they where strut products are a violation as they are not listed.

Most Caddy type products are listed for 'positioning only' whatever that means.

[This message has been edited by iwire (edited 06-03-2006).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#98584 - 06/04/06 07:10 PM Re: EMT installation  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,872
Brick, NJ USA
As above tywraps are legal for MC. As to EMT, as there is no references yay or nay, the AHJ has the 'gray area' to determine. Above a drop ceiling? On bar joists?

IF it's a plenum ceiling, the ty-wraps require 'plenum' rating (if plastic mat'l)

My gut call? Adequate spacing...adequate support..OK. But remember, my gut call!

John


John

#98585 - 06/05/06 09:42 AM Re: EMT installation  
NJwirenut  Offline
Member
Joined: Sep 2001
Posts: 806
Bergen County, NJ
Quote
Most Caddy type products are listed for 'positioning only' whatever that means.


I always interpreted that as meaning they were OK for holding conduit etc. in place, but not for "dynamic load" type applications. i.e I wouldn't use them as part of an overhead lifting setup or whatever...



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