Question About Box Supporting 314.23 (e)

 
Thread Tools Search this Thread Display Modes
Old 08-07-2008, 01:37 PM   #1
Pro
 
CNC's Avatar
 
Trade: Electrician
Join Date: Mar 2006
Location: California
Posts: 182

Question About Box Supporting 314.23 (e)


in article 314.23 (E) its states

raceways supported enclosures without devices need to have threaded bodies, OR hubs identified for this purpose. Now a NEMA box within the correct size, supported by 2 emt raceways, with rain tight connectors do it? WHere do i find hubs identified for it.

We have to fix a bunch of boxs, that got stubbed up to an attic, and then a junction box got added, and MC was run directly out of it. Most of the boxs are only stubbed up 10 or so inches, with one pipe. Its a 16 inch center wood framed attic so there isnt much to mount to. i guess ill have to mount them on uni strut, any quick tips?

CNC is offline  
Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Old 08-09-2008, 04:24 PM   #2
Service & Repairs
 
Magnettica's Avatar
 
Trade: Electrician
Join Date: Dec 2006
Location: Rahway, New Jersey
Posts: 3,998

Re: Question About Box Supporting 314.23 (e)


Quick tips?

Yes, forget about the unistrut - that's for industrial type stuff and looks lousy in a home. Use wood (perhaps plywood or whatever works) and fasten it across the floor joists. Mount j-boxes to that. I hope I understood your question.
Magnettica is offline  
Old 10-14-2008, 02:18 PM   #3
Registered User
 
vocivictim's Avatar
 
Trade: Electrician
Join Date: Oct 2008
Posts: 2

Re: Question About Box Supporting 314.23 (e)


EMT cannot be used to support an enclosure. Only rigid or IMC. The only listed hubs I know of are Meyers hubs and will not work for this installation. Hope this helps!!
vocivictim is offline  
Old 10-14-2008, 05:00 PM   #4
Fentoozler
 
Celtic's Avatar
 
Trade: Professional Pie and Pastry Taster
Join Date: May 2007
Location: New Jersey
Posts: 5,585

Re: Question About Box Supporting 314.23 (e)


Quote:
Originally Posted by CNC View Post
.... supported by 2 emt raceways, with rain tight connectors do it? WHere do i find hubs identified for it.
You don't.

Lets look at the NEC:
Quote:
314.23(E) Raceway Supported Enclosure, Without Devices,
Luminaires (Fixtures), or Lampholders.

An enclosure that does not contain a device(s) other than splicing devices
or support a luminaire(s) [fixture(s)], lampholder, or other equipment and is supported by entering raceways shall not exceed 1650 cm3 (100 in.3) in size. It shall have threaded entries or have hubs identified for the purpose. It shall be supported by two or more conduits threaded wrenchtight into the enclosure or hubs. Each conduit shall be secured within 900 mm (3 ft) of the enclosure, or within 450 mm (18 in.) of the enclosure if all conduit entries are on the same side.
You can't thread EMT, so it will never be "wrenchtight".

Even the exception doesn't help...
Quote:
Exception:
Rigid metal, intermediate metal, or rigid nonmetallic conduit or electrical metallic tubing shall be permitted to support a conduit body of any size, including a conduit body constructed with only one conduit entry, provided the trade size of the conduit body is not larger than the largest trade size of the conduit or electrical metallic tubing.
A box is not a conduit body.


A wood frame to act as support is the easiest choice.
__________________


The UD is quite possibly man kinds finest accomplishment.
Celtic is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Question about bidding vinyl wallcovering kanadaeh Painting & Finish Work 9 02-19-2009 05:29 PM
Sewer Infrastructure Question ABLE1 Excavation & Site Work 20 05-28-2008 11:05 AM
Firewall question Derek13 Commercial Construction 3 12-11-2007 04:52 PM

Join Now... It's Fast and FREE!

Privacy Badge
I am a professional contractor
I am a DIY Homeowner
ContractorTalk.com is for
PROFESSIONAL CONTRACTORS ONLY!

At ContractorTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?