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
breaker meltdown
by sparky
Today at 07:30 PM
230 or 345 kV transmission lines?
by Vlado
09/24/16 09:33 AM
Electrical mast flashing product
by ThomasWinfrey
09/22/16 12:14 AM
What estimating software do you recommend?
by sparky
09/21/16 07:20 PM
"Dry Run" Inspection goes awry
by HotLine1
09/20/16 07:39 PM
New in the Gallery:
12.5A through 0.75mm≤ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 14
sparky 10
sparky66wv 8
gfretwell 8
Vlado 6
Who's Online
0 registered (), 286 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#197451 - 11/30/10 05:30 PM EMT straps
SJT Offline
Member

Registered: 07/24/02
Posts: 242
Loc: PATCHOGUE, N.Y.
I have a question about the mae-west style conduit hanger straps that have a 1/4 x 20 bolt with a nut on it that is to hang EMT, pipe etc. There was a crew that were hanging 2 lamp fluoresent fixtures from the 1/4 x 20 screw. Then putting another nut onto it to secure the fixture chain. The mae-west they were using was also supported the pipe. Is this legal? I told them they need independent support.
Am I right? Thanks

Top
2014 / 2011 NEC & Related Books and Study Guides
#197469 - 12/01/10 07:20 AM Re: EMT straps [Re: SJT]
ghost307 Offline
Member

Registered: 05/09/05
Posts: 876
Loc: Chicago Illinois USA
What's a mae-west style conduit hanger?
_________________________
Ghost307

Top
#197470 - 12/01/10 07:43 AM Re: EMT straps [Re: ghost307]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
SJT:

Are you talking about what I call a 'cowboy' strap? 1/4-20 hdwe on bottom to secure pipe, and a 'available' mounting hole at the top to secure the strap to rod, or structure.

That strap is only listed for pipe support IMHO.

As to supporting a luminaire from a raceway that is used for wiring, that's a 'no-no', unless the raceway is specifically listed for support. (ie: strut assembly, vs EMT)
_________________________
John

Top
#197471 - 12/01/10 08:47 AM Re: EMT straps [Re: HotLine1]
SJT Offline
Member

Registered: 07/24/02
Posts: 242
Loc: PATCHOGUE, N.Y.
John,
You got the correct strap. It's called diffrent names. I look at it the same way. I had told them the clamp is part of the EMT, which you cannot use to supprt the fixture. I'll stick to my guns on this one. I want to see another method to hang the lights.
Thanks

Top
#197473 - 12/01/10 12:11 PM Re: EMT straps [Re: SJT]
KJay Offline
Member

Registered: 11/27/07
Posts: 763
Loc: MA, USA
I donít believe EMT supports are required to be listed like fittings are, but if they happen to be, then I agree that it would most likely be a violation of the listing.
Iím not sure the definition of a Fitting in Art. 100, could be stretched to include support straps and hangers though.
Even so, I would think that 110.3[A] 1, 2 and 8 should probably be applicable as well as possibly 358.12[5].

Top
#197480 - 12/01/10 05:08 PM Re: EMT straps [Re: KJay]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
Kjay:

Perhaps, I used an incorrect term 'listed'. Yes, 110.3 etc. could be cited but I may have a hard time finding 'instructions' within a box of straps, without doing a lot of Google type research. From field experience, and common sense neither of which are within the NEC, is what I based my above comments on. In the event that someone requested an Article for a rejection citing, IMHO 110.3 comes to mind without cracking the book.
_________________________
John

Top
#197574 - 12/07/10 07:16 PM Re: EMT straps [Re: HotLine1]
frenchelectrican Offline

Member

Registered: 02/06/03
Posts: 938
Loc: Wi/ Paris France { France for ...
SJT.,

If you don't mind if you can fill me in about the 1/4X20 bolt and how long is that bolt is secured and what kind of wall or surface it is mounted.

Normally I rather have the conduit straps seperated from the luminaire supports it kinda boil down to the common sense.

Merci.
Marc
_________________________
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


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