Re: Short Plenum Run Question

[nobody@xxxxxxxxxxxx (Dave Houston)]

I have no idea how the NEC may define it but the normal definition of plenum
is "a chamber at higher than atmospheric pressure."

L. M. Rappaport <nospam@xxxxxxxxxxx> wrote:

>On 29 Nov 2005 01:06:59 -0800, robertlbass@xxxxxxxxxxx wrote (with
>possible editing):
>
>>> In addition to Robert's coments, building codes may allow you to run
>>standard FT-4 as well (for communications and network)...
>>
>>NOT in a duct.  This is a duct -- not a plenum -- and US code does not
>>permit any cables within it except those necessary to operate the duct.
>>
>>> In Vancouver (for instance) you don't need to run plenum
>>> rated wire in a plenum if the total length of the wire run
>>> (from panel to device) doesn't exceed 9 meters...
>>
>>Same here although the distance isn't the same, but that rule does not
>>apply to ducts.
>>
>>Regards,
>>Robert L Bass
>>www.BassBurglarAlarms.com
>
>While you're right about those cables not being allowed in a duct, I
>am still not so sure it's a duct and not a plenum.  I've read and
>re-read his post and it still isn't clear to me.   It doesn't sound
>like everything is enclosed in tin and the wires may be below the tin
>part.  That sounds like a plenum, not a duct.
>
>Theron - do the wires go through a channel enclosed on all sides by
>sheet metal or is the only sheet metal on the top?
>
>No flame, just trying to visualize what he has.