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Old 12-18-2012, 10:16 AM   #16
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Routing coax through small section of cold air return


Quote:
Originally Posted by Jim Port View Post
It is not a free for all. The cable needs to follow the rules shown above.

Sublime, many here try to only give answers that follow the code. When you give answers it would help greatly if you would give correct answers also not just ones you agree with.
As I said,IN THIS SITUATION with this particular person it is a free for all as kbuz put it. The code is posted above for all to see what is required in DIFFERENT situations.
Thanks for the advice though!

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Old 12-18-2012, 10:34 AM   #17
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Routing coax through small section of cold air return


From how I interpret the OPs situation, he would need plenium rated cat 5, because it is not running thru the joists.

Not to mention the possible violations for cutting a jack into a stud space being used as a cold air return.
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Old 12-18-2012, 11:04 AM   #18
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Routing coax through small section of cold air return


A stud cavity used for a furnace air return is a plenum. It has access to a continuous supply of air that will support combustion of flammable materials such as cables. But it does not have to be lined with sheet metal. Contrasted with a normal stud cavity that is closed on all sides and ends.
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Old 12-18-2012, 03:17 PM   #19
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Routing coax through small section of cold air return


What if I made a tiny hole, just big enough to fit the coax and make sure it is plenum rated? Would that be okay?

I made a crude picture for clarification





Based on the picture, you might be thinking why I didn't just go straight up to the low voltage plate. There is a pipe in the way underneath. So I wanted to avoid hitting it if possible.

Last edited by gta; 12-18-2012 at 03:39 PM.
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Old 12-18-2012, 05:41 PM   #20
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Routing coax through small section of cold air return





Yes you can run plenum rated cable CATVP any way you want but are limited to 4 feet max inside the plenum.

Would either blue line work? Both OK with plain CATV.
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Old 12-18-2012, 05:52 PM   #21
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Routing coax through small section of cold air return


Quote:
Originally Posted by k_buz View Post
From how I interpret the OPs situation, he would need plenium rated cat 5, because it is not running thru the joists.
.
Quote:
Originally Posted by brric View Post
It is not a plenum. NM-B is run perpendicular all the time and it is not plenum rated.
Which is it?
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Old 12-18-2012, 05:57 PM   #22
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Routing coax through small section of cold air return


300.22 Wiring in Ducts Not Used for Air Handling,
Fabricated Ducts for Environmental Air, and Other
Spaces for Environmental Air (Plenums).

C) Other Spaces Used for Environmental Air (Ple-
nums). This section shall apply to spaces not specifically
fabricated for environmental air-handling purposes but used
for air-handling purposes as a plenum. This section shall
not apply to habitable rooms or areas of buildings, the
prime purpose of which is not air handling.


Exception: This section shall not apply to the joist or stud
spaces of dwelling units where the wiring passes through
such spaces perpendicular to the long dimension of such
spaces.
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Old 12-18-2012, 06:02 PM   #23
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Routing coax through small section of cold air return


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Originally Posted by sublime2 View Post
Which is it?
Its exactly what those two posts say.

He needs to run plenium rated Cat 5 because he isn't running thru the joists/cold air.
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Old 12-18-2012, 06:06 PM   #24
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Routing coax through small section of cold air return


Is it possible to avoid the plenum issue entirely by running the coax thru the upper part of the wall cavity, above the return vent?

See the broken blue line below:
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Routing coax through small section of cold air return-coaxinplenum.jpg  
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Old 12-18-2012, 06:24 PM   #25
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Routing coax through small section of cold air return


Oh for goodness sake. Run the Cat 5 underneath the joists and pop up in the stud space next to the cold air.
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Old 12-18-2012, 06:46 PM   #26
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Routing coax through small section of cold air return


I Got it!

Just install a custom made stainless steel rigid conduit raceway for that 19 inch run!

This is getting ridiculous, just drill the damn holes and fish it in already!

I can't imagine it's a safety hazard, and if the inspector catches it he's superman.

Not my usual advice, but for crying out loud already!

Merry Christmas to all !!!
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Old 12-19-2012, 01:03 AM   #27
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Routing coax through small section of cold air return


Well, I was able to drill from the first floor down to the basement using a long twist bit. I avoided going through the return all together, so no code violations there.


Now I just have to figure out how to grab the fish tape in the basement. Part of my basement is finished and it just so happens that there is drywall directly beneath the hole I drilled. I can see the fish tape, but I can't reach it. I don't want to cut a hole into the drywall if possible.

I was thinking of fabricating a stick with a magnet at the end to grab onto the fish.

Any other method I should consider?
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Old 12-19-2012, 05:28 AM   #28
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Routing coax through small section of cold air return


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Originally Posted by gta View Post
Well, I was able to drill from the first floor down to the basement using a long twist bit. I avoided going through the return all together, so no code violations there.


Now I just have to figure out how to grab the fish tape in the basement. Part of my basement is finished and it just so happens that there is drywall directly beneath the hole I drilled. I can see the fish tape, but I can't reach it. I don't want to cut a hole into the drywall if possible.

I was thinking of fabricating a stick with a magnet at the end to grab onto the fish.

Any other method I should consider?
Auto mechanics are always dropping small parts, sometimes down into the cylinders, carb, etc.

Auto parts stores should have a collapsible rod (about the size of an extended FM antenna) with a magnet on the end. Might be easier just to pick one of those up instead of making one.
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Old 12-19-2012, 05:58 AM   #29
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Routing coax through small section of cold air return


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Originally Posted by k_buz View Post
Oh for goodness sake. Run the Cat 5 underneath the joists and pop up in the stud space next to the cold air.
Amen.
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Old 12-19-2012, 03:03 PM   #30
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Routing coax through small section of cold air return


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Originally Posted by Dave632 View Post
Auto mechanics are always dropping small parts, sometimes down into the cylinders, carb, etc.

Auto parts stores should have a collapsible rod (about the size of an extended FM antenna) with a magnet on the end. Might be easier just to pick one of those up instead of making one.

I have one of those, but it isn't long enough. Thanks anyway.

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