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Support of 4 inch square boxes #201465 06/02/11 04:01 PM
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

Work Gear for Electricians and the Trades
Re: Support of 4 inch square boxes [Re: SJT] #201468 06/02/11 05:45 PM
Joined: Jul 2007
Posts: 1,335
S
sparkyinak Offline
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
Re: Support of 4 inch square boxes [Re: SJT] #201469 06/02/11 06:16 PM
Joined: Jul 2007
Posts: 265
W
wire_twister Offline
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
Re: Support of 4 inch square boxes [Re: SJT] #201470 06/02/11 07:56 PM
Joined: Apr 2002
Posts: 7,214
HotLine1 Offline
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
Re: Support of 4 inch square boxes [Re: SJT] #201475 06/03/11 06:16 PM
Joined: Jun 2004
Posts: 1,273
T
Tesla Offline
Member
ERICO makes a series of appropriate box supports...

Check them out.



Tesla

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