<div>Also, it is against code to use the ceiling grid wires for support. Everything above should have it's own support. Many inspectors will let this slide, however.<br></div><div><br></div><div>The drop ceiling tiles themselves do not have to be sealed. A plenum air space uses the entire area above the drop ceiling for return air. A non-plenum space utilizes duct-work for return air. Look up inside the return air grates (the ones without the diffuser.) If you see ductwork, you can use non-plenum cable.</div>
<br><div class="gmail_quote">On Thu, Jul 28, 2011 at 3:58 PM, Adam Tauno Williams <span dir="ltr"><<a href="mailto:awilliam@whitemice.org">awilliam@whitemice.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im">On Thu, 2011-07-28 at 15:20 -0400, Michael Mol wrote:<br>
> On Thu, Jul 28, 2011 at 3:11 PM, Benjamin Flanders <<a href="mailto:flanderb@gmail.com">flanderb@gmail.com</a>> wrote:<br>
> > We are moving a closet shortly and I will need to string some more<br>
> > cable. With that in mind I was going to buy some cable and came up<br>
> > with a term that is new to me, "Plenum". It turns out that the<br>
> > airspace above a drop ceiling could be a plenum, and if such, the<br>
> > cabling that resides up there is much more expensive.<br>
> > Wikipedia provided an explanation of what a plenum is, but my question<br>
> > is is there a test to know if the airspace up there is a plenum?<br>
> Rule of thumb: if it's open to the HVAC system, you'll want plenum.<br>
<br>
</div>Yep.<br>
<div class="im"><br>
> > I<br>
> > believe that it is a somewhat sealed airspace, but the drop ceiling is<br>
> > old and not really sealed. Should I just call the fire inspector and<br>
> > ask him?<br>
> Not really useful as a CYA. Fire inspectors' knowledge of the fire<br>
> code is hit and miss. One fire inspectors' good-faith statement isn't<br>
> certification against another's.<br>
<br>
</div>Position of the cable matters to the fire inspector as well; cable<br>
cannot 'lay' on the suspended ceiling. It has to be secured up and away<br>
from the tile & grid. I've inherited a couple of sites who have been<br>
cited for this.<br>
<div class="im"><br>
> > Anyone else have this situation? We do have non-plenum<br>
> > cable up there right now, but my concern is that my predecessor didn't<br>
> > know about the law either and we might have to recable the whole<br>
> > office.<br>
> ><br>
> > Also, on a related note should I look at getting cat6 vs cat5e?<br>
> Not especially. As has been discussed in the past, while Cat6 is<br>
> *designed* to be able to handle gigabit signals, cat5e has improved<br>
> dramatically simply through better testing on the manufacturer end.<br>
> We're using gigabit over cat5e throughout our office. At home, I'm<br>
> running gigabit over cat5e, and gigabit over cat6, and I can't say<br>
> I've noticed a difference. I'd need to get my hands on a high-end<br>
> cable tester to make any kind of judgement.<br>
<br>
</div>+1 on just using Cat5.<br>
<div><div class="h5"><br>
<br>
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