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Pass Through Couplers

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#1 kwschumm



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Posted 31 January 2018 - 05:05 PM

For a new build I need to run network and surveillance cables up a low voltage wiring shaft into the attic and then out to the destination.


Of course the wiring shaft needs to be sealed at the top for fire code.


I was thinking that sealing the shaft with plywood and installing pass through couplers through the plywood would be a great way to do this. Never did like rework-ability of spray foam. This is my house so the incremental higher cost won't be an issue.


I'm a little concerned about losing some signal integrity through the use of them though.


Anyone ever done this before?

#2 wuench



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Posted 31 January 2018 - 06:35 PM

Most  data centers I have seen use solid foam that expands in a fire to block the chases...  This is the closest I could find.



Edited by wuench, 31 January 2018 - 06:37 PM.

#3 pete_c



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Posted 31 January 2018 - 07:28 PM

My electrical conduit going to the attic used expando foam and when I ran network cabling from the basement to the attic in the two story and used expando foam too.  All the CCTV under the second floor eaves came from the attic.  I built a chase from the basement to the attic.


I did once have an issue with the 120VAC smokes on the second floor due to moisture dripping down from the attic to the metal cans used for the smokes. 

#4 drvnbysound



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Posted 06 February 2018 - 04:20 PM

I've been in some commercial spaces where I've seen 4" conduit sealed with a fire putty; apparently named intumescent putty according to the link wuench shared above. Literally, exactly like shown in many photos on that page where the cable simply passes though the conduit w/o termination...  like this: 

#5 Neurorad



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Posted 12 June 2018 - 03:58 PM

Duct Seal is another brand of conduit putty, to block the spread of fire (and bugs), in conduit.

#6 Work2Play



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Posted 22 June 2018 - 09:43 AM

I've used the jacks you're talking about at times - but never for that application.  In theory you lose a little signal but with just one in the mix, you'd be fine.  However, they are another connection point - they can get dirty over the years and deteriorate the connection quality, especially in a dirty unconditioned space.  Plus, if you have a bad insertion, how far will that wire fall back into the wall?


Personally I'd run everything now in a single conduit and seal it up as suggested above - but also leave 2-3 extra tubes coming up that are just capped and not plugged with fire putty - so if you choose to use them in the future, you can run the next bundle up, then seal them as well (lets be honest; homeowners never worry about code once the inspector leaves; they'd just use it as an open conduit for the future).

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