Floor Cell System

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mstrlucky74

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Hoping you guys can see pic. I tried to covert to pdf but itwas too big even after compressing. I have an existing floor cell/trench ductsystem. When installing floor devices as shown in pic I’m assuming you have tocore through concrete then penetrate the top of the cell. How would you dothat, hole saw? Also isn’t it a PIA to pull cables through this system. I’venever come across one of these. Any insight would be greatly appreciated. Thanks,
 

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He a part of the existing as-built condition showing thetrench duct. There are lines from the panels(conduits??) to points on thetrench ducts. Is that where the cells get activated? How exacty? So is theentire cell live? Branch circuits are connected to it? How? Thanks.
 

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A company I used to work for did a lot of service and remodels for King Soopers grocery stores.
They used Walker duct throughout to feed the shelves and POS. We would use a dry core drill to get through the concrete. Then a dual hole saw of the size we needed, and the next size up to stop the hole saw from penetrating down into the wiring in the duct. Not every arbor will hold two hole saws, but some have long enough threads to do so, you have to find the right combination. Then there were adapters the locked into the duct that would accept conduit fittings. And no, it's not much fun pulling wire, etc.
 
mstrlucky74 said:
Hoping you guys can see pic. I tried to covert to pdf but itwas too big even after compressing. I have an existing floor cell/trench ductsystem. When installing floor devices as shown in pic I’m assuming you have tocore through concrete then penetrate the top of the cell. How would you dothat, hole saw? Also isn’t it a PIA to pull cables through this system. I’venever come across one of these. Any insight would be greatly appreciated. Thanks,
Click to expand...

First you core a hole in the concrete 2.5" I believe and then you use a hole saw about 1 7/8" to penetrate the cell. After that you install a transition fitting sometimes called an "after set" which gives you a threaded entry into the cell.

From there you can install your "dog house" or whatever you're using to transition to another wring method.
 
infinity said:
First you core a hole in the concrete 2.5" I believe and then you use a hole saw about 1 7/8" to penetrate the cell. After that you install a transition fitting sometimes called an "after set" which gives you a threaded entry into the cell.

From there you can install your "dog house" or whatever you're using to transition to another wring method.
Click to expand...

This gets my current vote as the number one job I don't ever want to do.
 
Thanks a lot guys. So as far as the second drawing I posted what kind of application does that look like to the duct? Homerun conduits?
 
Anyone know what you would do for the floor box pic? How would cables enter? Floor boxes usually have ko's in the side. It says j-box tap to duct system(it's existing duct).
 
mstrlucky74 said:
Thanks a lot guys. So as far as the second drawing I posted what kind of application does that look like to the duct? Homerun conduits?
Click to expand...

Maybe I'm just extra slow this Monday, but I can't quite grasp what your plan shows. Are the vertical lines the conductors in the floor duct? If so, how are the cross connections getting made, and why does it look like one conductor may touch multiple phases/conductors??
 
mstrlucky74 said:
Anyone know what you would do for the floor box pic? How would cables enter? Floor boxes usually have ko's in the side. It says j-box tap to duct system(it's existing duct).
Click to expand...


The drawing in post #2 is basically useless (although the dark lines could be the header duct that runs perpendicular to the floor cells), it looks like in the detail for the floor box it's chopped into the concrete and nippled to the floor duct system below.
 
Do do you have access to the American Electricians Handbook edition 12?
If you do, look at 9-91 to 9-105 and 9-137 to 9-153. There is a fair amount of information in this section about in floor systems.


mstrlucky74 said:
Anyone know what you would do for the floor box pic? How would cables enter? Floor boxes usually have ko's in the side. It says j-box tap to duct system(it's existing duct).
Click to expand...
 
pjholguin said:
Do do you have access to the American Electricians Handbook edition 12?
If you do, look at 9-91 to 9-105 and 9-137 to 9-153. There is a fair amount of information in this section about in floor systems.
Click to expand...

No but maybe I'll get It. Is it helpful overall?
 
I couldn't figure how to insert a pdf here, but google "Walkerduct Floor Boxes" and check out the pdf's on installation
 
So I have a bunch of small offices on the floor with receptacles everywhere. Would wall receptacles be fed from the trench duct or would they be fed from overhead? If I could feed them from the trench duct I don't think the receptacles would fall right by the trench duct in every location. So if have to go horz in wall then down to duct. Not sure how you make entry into duct with cable of this could happen at all.
 
mstrlucky74 said:
So I have a bunch of small offices on the floor with receptacles everywhere. Would wall receptacles be fed from the trench duct or would they be fed from overhead? If I could feed them from the trench duct I don't think the receptacles would fall right by the trench duct in every location. So if have to go horz in wall then down to duct. Not sure how you make entry into duct with cable of this could happen at all.
Click to expand...

If you can go overhead and the powers that be will let you, why in the world would you want to try and tap the trench duct?
 
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