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Old 05-12-2008, 09:13 PM   #31
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Running wire through a cold air return?


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My Uncle John was never a monkey's uncle but your intitled to your opinion on him though I bet you would never say that to his face...But what about my answer?? was it right or wrong ??or do you even know ??

Yes I do know, you're wrong...................... and so is your uncle

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Old 02-25-2010, 10:58 PM   #32
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Running wire through a cold air return?


The OP originally asked about running Romex through a joist cavity being used as a cold air return. I'm trying to accomplish a similar task. Someone else said that it could be done if it is in a conduit or MC type cable.
Is this accurate? Is there any electrical cable rated for plenum use? (BX / MC, etc...)?
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Old 02-26-2010, 03:44 AM   #33
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Running wire through a cold air return?


But nm in the space enclosed by joists and the ceiling of one story and the floor of the next can be used as a raceway for nm, can it not, as long as the space isn't being used for routing air for heating or cooling, yes? I did that for cable to a ceiling fan and light, while stapling the cable half way up the side of a joist.
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Old 02-26-2010, 10:32 AM   #34
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Running wire through a cold air return?


Quote:
Originally Posted by skirack View Post
The OP originally asked about running Romex through a joist cavity being used as a cold air return. I'm trying to accomplish a similar task. Someone else said that it could be done if it is in a conduit or MC type cable.
Is this accurate? Is there any electrical cable rated for plenum use? (BX / MC, etc...)?
If it were me and I needed to cross a cavity that is being used as a duct or plenum (trying to avoid that argument again), I would use a piece of EMT large enough to comfortably put the NM through it and seal the ends of the EMT to the studs/joists with a fire caulk. While this is not necessary, I believe it provides for the best installation as the NM, if exposed to excessive heat, will not gas off toxic fumes into an air handling space and where the stud/joist is penetrated, there will be no air leakage.



in the code section concerning duct and plenums, MI and MC (only that type with a continuous smooth or corrugated outer sheath without a non-metallic outer layer (in other words, not the typical MC with the spiral wrap metal sheath as well as any MC that has an outer non-metallic sheath) is allowed as well as solid metal conduits (FMC has very limited and specific uses allowed but not as a general wiring method.)

in "other spaces used for environmental air", basically, the material needs to be listed for use in a plenum air space.

If that doesn't make sense. let me know. I realize it is confusing as written but trying to avoid excessive verbiage.

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Originally Posted by Klawman View Post
But nm in the space enclosed by joists and the ceiling of one story and the floor of the next can be used as a raceway for nm, can it not, as long as the space isn't being used for routing air for heating or cooling, yes? I did that for cable to a ceiling fan and light, while stapling the cable half way up the side of a joist.
correct. the problem comes in when the cavity is being used as an air transfer space that could conceivably cause toxic gases to be spread throughout the building should the plastic sheath be exposed to excessive heat.

Last edited by nap; 02-26-2010 at 10:34 AM.
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Old 02-26-2010, 11:09 AM   #35
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Running wire through a cold air return?


Wow! Now I know why I joined this chatroom. Gret stuff people.
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Old 02-27-2010, 02:05 PM   #36
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Running wire through a cold air return?


Quote:
Originally Posted by Lansing View Post
Its bad business to do that...The answer is no... My Uncle a master electican said a good electican wouldn't do that anyway...
My uncle is a truck driver and he says its okay to do it.

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Wow! Now I know why I joined this chatroom. Gret stuff people.
Welcome to the forum.
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Old 02-27-2010, 04:08 PM   #37
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Running wire through a cold air return?


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My uncle is a truck driver and he says its okay to do it.

:
all my uncles are deceased and they didn't have anything to say about the subject.





did that cross the line?
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Old 02-28-2010, 11:57 AM   #38
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Running wire through a cold air return?


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all my uncles are deceased and they didn't have anything to say about the subject.





did that cross the line?
No.

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