Switchgear on wood floor

[bob nowinski]

I have a manufacturing facility which has a 480v switchgear mounted on a mezzanine constructed on 3/4" plywood. Since the switchgear was manufactured without a bottom, is there any code restrictions as to having the bottom open to the wood floor?

 

[mayanees]

I think no problem.
JM

 

[mcclary's electrical]

I have done the same exact thing in situations before.

 

[Joe Villani]

Take a look at 408.17.

I would be concerned if the switchgear has a open bottom.

Joe

 

[yucan2]

Take a look at 408.17.

I would be concerned if the switchgear has a open bottom.

Joe

I learn something everyday.

 

[heybud]

A piece of sheet meatal works well

 

[don_resqcapt19]

The instructions for most open bottom electrical equipment specify an installation over a non-combustible floor.

 

[Article 90.1]

The last piece of 480v gear we placed was several thousand pounds, which was a pretty concentrated load on the 1" sheet metal that formed the bottom lip all the way around it. Structurally, I might question if 3/4" plywood is sufficient, but I'd have to see it.