The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Forum Software Upgrade coming soon...
by Ruben Rocha
01/18/17 07:05 PM
ESA Arc flash course
by frank
01/18/17 04:25 PM
Re: Fabricating Guards out of Lexan?
by frank
01/17/17 04:11 PM
Would ELV branch circuits be a good idea?
by gfretwell
01/17/17 01:26 PM
Why cables look like they do
by Texas_Ranger
01/17/17 12:33 PM
New in the Gallery:
Desk-mounted "power-board"
Top Posters (30 Days)
Webmaster 26
HotLine1 21
Ruben Rocha 14
Trumpy 12
ghost307 12
Who's Online
2 registered (Webmaster, Ruben Rocha), 0 Guests and 187 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#98577 - 06/02/06 02:26 AM EMT installation
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
Question received by e-mail:

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

Top
2017 / 2014 NEC & Related Books and Study Guides
#98578 - 06/02/06 04:13 AM Re: EMT installation
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
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.
_________________________
George Little

Top
#98579 - 06/02/06 10:56 AM Re: EMT installation
GalwayElectric Offline
Member

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

Top
#98580 - 06/02/06 11:57 PM Re: EMT installation
macmikeman Offline
Member

Registered: 07/16/02
Posts: 718
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.

Top
#98581 - 06/03/06 12:16 AM Re: EMT installation
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
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.
_________________________
Mark Heller
"Well - I oughta....." -Jackie Gleason

Top
#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).]

Top
#98583 - 06/03/06 06:24 AM Re: EMT installation
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
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).]
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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


Member

Registered: 04/03/02
Posts: 6831
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
_________________________
John

Top
#98585 - 06/05/06 06:42 AM Re: EMT installation
NJwirenut Offline
Member

Registered: 09/15/01
Posts: 816
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...

Top


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals