ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Danish type K Sockets
by winston_1 - 10/25/21 07:30 PM
Flexible Conduit?
by gfretwell - 10/24/21 01:59 AM
May I backfeed 3 phase transformer?
by dsk - 10/22/21 04:37 AM
Wire sizing
by gfretwell - 10/21/21 10:12 PM
GFCI's pops in large numbers
by dsk - 10/21/21 02:03 AM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
1 members (winston_1), 35 guests, and 18 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jul 2002
Posts: 241
S
SJT Offline OP
Member
Would it be allowed to support a 4 inch square (1900) box with threaded rod? The box contains a single receptacle, (110v)
The threaded rod is approx. 10' long, suspened from the steel work above. The box does sway (move) with the rest of the conduit when disturbed.
In the NEC, they talk about the box shall be securely fastened. Does that mean, no movement at all?
Then the job would need extra bracing. There are approx. 20 boxes. There is 3/4" rigid conduit installed between boxes.
Good Day
SJT

Joined: Jul 2007
Posts: 1,335
S
Member
Since it is only rigid conduit, you will have to supply some sort of lateral support to prevent swaying. We may need additional info on what your intent is


"Live Awesome!" - Kevin Carosa
Joined: Jul 2007
Posts: 265
W
Member
You can sleeve the threaded rod with 1/2 emt pipe, tightened up between the top and bottom jamb nuts and it will stiffen it considerably


Jimmy

Life is tough, Life is tougher when you are stupid
Joined: Apr 2002
Posts: 7,283
Likes: 3
Member
Some additional info:

Is the 3/4 RGC supported? What is the RGC length between boxes?

Are the 20+/- boxes in a straight row? Or what layout?



John
Joined: Jun 2004
Posts: 1,273
T
Member
ERICO makes a series of appropriate box supports...

Check them out.



Tesla

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Tom
Tom
Shinnston, WV USA
Posts: 1,044
Joined: January 2001
Top Posters(30 Days)
dsk 7
Popular Topics(Views)
284,901 Are you busy
217,448 Re: Forum
203,751 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5