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#98577 - 06/02/06 02:26 AM EMT installation
pauluk Offline
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Registered: 08/11/01
Posts: 7520
Loc: 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 04:13 AM Re: EMT installation
George Little Offline
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Registered: 01/18/04
Posts: 1488
Loc: 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.
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#98579 - 06/02/06 10:56 AM Re: EMT installation
GalwayElectric Offline
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Registered: 09/22/05
Posts: 14
Loc: 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
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#98580 - 06/02/06 11:57 PM Re: EMT installation
macmikeman Offline
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Registered: 07/16/02
Posts: 717
Loc: 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.
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#98581 - 06/03/06 12:16 AM Re: EMT installation
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
Loc: 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.
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#98582 - 06/03/06 05:33 AM Re: EMT installation
GalwayElectric Offline
Member
Registered: 09/22/05
Posts: 14
Loc: 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).]
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#98583 - 06/03/06 06:24 AM Re: EMT installation
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4391
Loc: 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).]
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#98584 - 06/04/06 04:10 PM Re: EMT installation
HotLine1 Offline


Member
Registered: 04/03/02
Posts: 6778
Loc: 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
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#98585 - 06/05/06 06:42 AM Re: EMT installation
NJwirenut Offline
Member
Registered: 09/15/01
Posts: 806
Loc: 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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