Bad Support Design!!!

[transman2]

Hello,

I have contractor that installed a 3' piece of strut on a conveyor walkway by supporting the last 3" of the unistrut to a piece of the outside grating angle so 35" is in free air. He supported it by drilling through the the angle and installing a springnut instead of bolting through with a square washer and double nut it. There will be 3 conduits on strut and its a horizontial application. The spacing is fine but I'm use to seeing this done by supporting from angle to angle with 1 bolt in each and protrude out far enough to install 3 conduits. You can pull down on the strut and twist the angle with the design now.

Is there a code reference for this poor design to get the contractor to change it.?

Thanks!!!

 

[LEO2854]

Hello,

I have contractor that installed a 3' piece of strut on a conveyor walkway by supporting the last 3" of the unistrut to a piece of the outside grating angle so 35" is in free air. He supported it by drilling through the the angle and installing a springnut instead of bolting through with a square washer and double nut it. There will be 3 conduits on strut and its a horizontial application. The spacing is fine but I'm use to seeing this done by supporting from angle to angle with 1 bolt in each and protrude out far enough to install 3 conduits. You can pull down on the strut and twist the angle with the design now.

Is there a code reference for this poor design to get the contractor to change it.?

Thanks!!!

Hello transman:thumbsup:

I don't think there is but,why is the contractor building your racks?

 

[augie47]

You might rely on the 1st sentence of 300.11

 

[infinity]

I'm assuming that the struts cannot move once the conduits are installed. All that's required by the NEC is that it's mechanically secured it doesn't need to be pretty.

 

[ActionDave]

You can pull down on the strut and twist the angle with the design now.

Is that going to be happening a lot?