ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
AFDD's coming to the UK
by Texas_Ranger. 02/18/19 02:04 PM
by Texas_Ranger. 02/18/19 02:01 PM
by gfretwell. 02/16/19 01:08 PM
PurpleAir Recalls Power Supply Units
by Admin. 02/14/19 08:43 PM
Utility Company Programs
by katty81. 02/14/19 11:11 AM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 1 guest and 12 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
EMT installation #98577
06/02/06 04:26 AM
06/02/06 04:26 AM
pauluk  Offline OP
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Question received by e-mail:

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

2017 / 2014 NEC & Related Books and Study Guides
Re: EMT installation #98578
06/02/06 06:13 AM
06/02/06 06:13 AM
George Little  Offline
Joined: Jan 2004
Posts: 1,493
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
Re: EMT installation #98579
06/02/06 12:56 PM
06/02/06 12:56 PM
GalwayElectric  Offline
Joined: Sep 2005
Posts: 14
Rutherford, NJ
A bar joist as in:

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?

Re: EMT installation #98580
06/03/06 01:57 AM
06/03/06 01:57 AM
macmikeman  Offline
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.

Re: EMT installation #98581
06/03/06 02:16 AM
06/03/06 02:16 AM
e57  Offline
Joined: May 2003
Posts: 2,876
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
Re: EMT installation #98582
06/03/06 07:33 AM
06/03/06 07:33 AM
GalwayElectric  Offline
Joined: Sep 2005
Posts: 14
Rutherford, NJ

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).]

Re: EMT installation #98583
06/03/06 08:24 AM
06/03/06 08:24 AM
iwire  Offline
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
Re: EMT installation #98584
06/04/06 06:10 PM
06/04/06 06:10 PM
HotLine1  Offline

Joined: Apr 2002
Posts: 7,069
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!


Re: EMT installation #98585
06/05/06 08:42 AM
06/05/06 08:42 AM
NJwirenut  Offline
Joined: Sep 2001
Posts: 806
Bergen County, NJ
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...


2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
lil suzi
lil suzi
Posts: 57
Joined: August 2003
Show All Member Profiles 
Top Posters(30 Days)
Admin 7
Popular Topics(Views)
253,249 Are you busy
189,888 Re: Forum
179,598 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.031s Queries: 14 (0.006s) Memory: 1.0016 MB (Peak: 1.1711 MB) Zlib enabled. Server Time: 2019-02-19 09:04:29 UTC