raised floor

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GSXR600

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Does anyone know the requirement of grounding the pedestals of a raised floor in an IT room
if any
 
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There's the egc requirement from an NEC standpoint.
But very important to a Data Center is the SRG, Signal Reference Ground, which is intended to shunt higher frequency noise. Our company standardized on a #6 wire of minimal length tapped to the SRG bus just under the raised floor.
John M
 
It is specification/designer specific.
If there are metallic stringers, some folks do every other pedestal, some every 10th pedestal and some have none except a single bond to one corner.
Depends on the design.
 
There aren't any code requirements on this topic that I am aware of. It is up to the designer. If you are looking for guidance, Google searches on 'raised floor grounding grid' or 'signal reference grid' may be helpful. The most helpful thing to have would be whichever IEEE color book was applicable (it's been too long, I don't remember which one) but I've seen very few people with those unfortunately.
 
SRG's are antiquated today and do not serve any real purpose anymore. We use to use them in all data centers and telecom offices but quit using them long ago.

They were useful when I/O topology used unblanced ground referenced signal I/O protocols like RS 232 and other unbalanced mediums. Todays communication protocols used balanced (ethernet) and optical transmisiion, ground reference has no meaning or use any more.

Only place you se RS-232 used is craft ports that a tchnician uses to connect his laptop up to for maintenence on the equipment he is stanging in front of. Remote O&M uses either ethernet or optical modems
 
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GSXR600 said:
do you ground every pedestal or every other one or what is ussually done
Click to expand...
When it is done the best method is to use a raised floor design that uses the stringers and floor tiles designed as such. The tiles have copper strip along the bottom edges, and the stringers have wiper brushes to make contact. Then as Ron says you can run a singler cable from the nearest ground source to the nearest pedestal and be done with it inexpesively and very effectively.
 
If the EE has not given any requirements as to what he wants then you could call the dealership that supplied the raised floor and ask for their recommendation for that particular flooring.
Requirements vary due to type of floor, height of floor and the state/municiple requirements.
As I don't know any of these for this post I can't give much more then this.
 
dereckbc said:
SRG's are antiquated today and do not serve any real purpose anymore. We use to use them in all data centers and telecom offices but quit using them long ago.

They were useful when I/O topology used unblanced ground referenced signal I/O protocols like RS 232 and other unbalanced mediums. Todays communication protocols used balanced (ethernet) and optical transmisiion, ground reference has no meaning or use any more.

Only place you se RS-232 used is craft ports that a tchnician uses to connect his laptop up to for maintenence on the equipment he is stanging in front of. Remote O&M uses either ethernet or optical modems
Click to expand...

In my little head (OK, actually I have a big egg-shaped head), SRG = raised floor grounding grid. I'm not entirely sure how to interpret your post. Do you mean that these aren't the same and only SRG is outdated, or am I right and they are the same and the entire topic is outdated? Just want to make sure I understand. I only have limited experience on this subject (obviously :D) and want to make sure that I understand.

What I worked on was the raised floor of a computer room. My memories on the subject are quite fuzzy, but I think we strung a bare copper conductor around underneath the floor and connected it to every other riser.

BTW, it was the IEEE Emerald book I was thinking of. I used to have access to them but haven't now for a few years.
 
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