Wireway or duct for under raised floor

[steve66]

I am planning for the installation of a new raised floor in an office. I am not sure what I need for a wireway or duct under the raised floor. (The wireway will feed FMC whips with receptacles on the ends). Does the wireway have to be completely enclosed? Can someone reccomend a brand and part number?

Right now I am planning to use a 6 x 3.5" Square D "Wall duct" made for xray machines. I have also considered Square D's "Trench Duct", but it seems like it is made to be installed flush in concrete.

Any advice would be appreciated.

Steve

 

[jerryb]

Re: Wireway or duct for under raised floor

A little more information might help. What is the primary purpose of the raised floor? Is it a computer room application or general office? Will the floor cavity be used for supply or return air? What is the approximate depth of the raised floor?

 

[steve66]

Re: Wireway or duct for under raised floor

It is a general office. The floor won't be either a supply or return for air. The raised floor is to provide power and Cat 5 cables to cubicles. It also provides some flexibility if the cubicles are rearranged.

I only have 7" to the top of the floor, and I think the floor panels are 1.25" thick. That leaves 5.75" from the existing floor to the bottom of the raised floor. With a 3.5" duct, that only leaves 2.25" of space to get the covers off. (There are stringers between the raised floor posts that are not easily removable).

Steve

 

[steve66]

Re: Wireway or duct for under raised floor

Anyone have any suggestions?

If someone offered to make a wire tray by bending sheet metal, would that comply with the code? Or would 376.120 prohibit this?

Can the type of duct made to be installed flush with a concrete floor be laid on top of a concrete floor?

Steve