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#201465 - 06/02/11 05:01 PM Support of 4 inch square boxes  
SJT  Offline
Member
Joined: Jul 2002
Posts: 241
PATCHOGUE, N.Y.
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


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#201468 - 06/02/11 06:45 PM Re: Support of 4 inch square boxes [Re: SJT]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,317
Alaska
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

#201469 - 06/02/11 07:16 PM Re: Support of 4 inch square boxes [Re: SJT]  
wire_twister  Offline
Member
Joined: Jul 2007
Posts: 265
Georgia USA
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

#201470 - 06/02/11 08:56 PM Re: Support of 4 inch square boxes [Re: SJT]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,809
Brick, NJ USA
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

#201475 - 06/03/11 07:16 PM Re: Support of 4 inch square boxes [Re: SJT]  
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
ERICO makes a series of appropriate box supports...

Check them out.



Tesla


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