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Grab-bar FW penetration

 
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jonlaury(at)impulse.net
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PostPosted: Wed Feb 22, 2006 12:12 am    Post subject: Grab-bar FW penetration Reply with quote

I think this was discussed in Vol 11 of the AC, but I loaned my copy to a friend.

Re the "grab bar" method, I recall that Bob said to fill the tube with firecaulk after all the wires were pulled. Now I see people are looking for the appropriate size firesleeve for their grab-bar conduit.

How does one use the firesleeve and get an air tight seal?

Thanks,
John


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rv8ch



Joined: 10 Jan 2006
Posts: 250
Location: Switzerland

PostPosted: Wed Feb 22, 2006 1:48 am    Post subject: Grab-bar FW penetration Reply with quote

> Re the "grab bar" method, I recall that Bob said to fill
> the tube with firecaulk after all the wires were pulled.
> Now I see people are looking for the appropriate size
> firesleeve for their grab-bar conduit.
>
> How does one use the firesleeve and get an air tight seal?
Hi John,

Here's how these guys recommend doing it. I'm planning
on doing the same thing on mine.

http://www.epm-avcorp.com/fwalinst.html

Here is my USD 30.00 "custom" towel bar:

http://www.rv8.ch/article.php?story=20060222102305941

Mickey

--
Mickey Coggins
http://www.rv8.ch/
#82007 finishing


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nuckollsr(at)cox.net
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PostPosted: Wed Feb 22, 2006 6:26 am    Post subject: Grab-bar FW penetration Reply with quote

At 12:04 AM 2/22/2006 -0800, you wrote:

Quote:


I think this was discussed in Vol 11 of the AC, but I loaned my copy to a
friend.

Re the "grab bar" method, I recall that Bob said to fill the tube with
firecaulk after all the wires were pulled. Now I see people are looking
for the appropriate size firesleeve for their grab-bar conduit.

How does one use the firesleeve and get an air tight seal?

No sealant inside the firesleeve . . .

See:

http://aeroelectric.com/articles/Firewall_Penetration/firewall.html

Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >


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jonlaury(at)impulse.net
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PostPosted: Wed Feb 22, 2006 11:56 am    Post subject: Grab-bar FW penetration Reply with quote

Subject: Re: Grab-bar FW penetration
From: Robert L. Nuckolls, III (nuckollsr(at)cox.net)
Date: Wed Feb 22 - 6:26 AM

Quote:
No sealant inside the firesleeve... So the last picture shows a piece of firesleeve wrapped around the wire bundle and the hose clamp "seals" it to the bundle? No sealant necessary?Next question: At Home Depot, there are 3-4 3M fire sealant/barrier caulks to chose from. Some are intumescentand some are not. Which one for FW's? I would guess that you don't want intumescent caulk expanding between FW layers during a fire. Mine is a composite firewall using Rohacell foam/glass sandwich for structure and Fiberfrax for fire protectionwith an aluminum sheet over the Fiberfrax for a wipeable surface.ThanksJohn

At 12:04 AM 2/22/2006 -0800, you wrote:

Quote:


I think this was discussed in Vol 11 of the AC, but I loaned my copy to a
friend.

Re the "grab bar" method, I recall that Bob said to fill the tube with
firecaulk after all the wires were pulled. Now I see people are looking
for the appropriate size firesleeve for their grab-bar conduit.

How does one use the firesleeve and get an air tight seal?

No sealant inside the firesleeve . . .

See:

http://aeroelectric.com/articles/Firewall_Penetration/firewall.html

Bob . . .


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Bruce(at)glasair.org
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PostPosted: Wed Feb 22, 2006 3:19 pm    Post subject: Grab-bar FW penetration Reply with quote

John,

3M (CP-25) caulk is used around the firewall because the foam contracts when
heated so you want to use an intumescent calk here. Around the fire sleeve I
would not expect any shrinkage so a non intumescent calk would be my choice.
You might look at RTV-88.

Bruce
www.glasair.org


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nuckollsr(at)cox.net
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PostPosted: Wed Feb 22, 2006 6:20 pm    Post subject: Grab-bar FW penetration Reply with quote

Quote:

>No sealant inside the firesleeve... So the last picture shows a piece of
firesleeve wrapped around the wire bundle and the hose clamp "seals" it
to the bundle?

correct

Quote:
No sealant necessary?

that's what the 'big' guys do . . .

Quote:
Next question: At Home Depot, there are 3-4 3M fire sealant/barrier caulks
to chose from. Some are intumescentand some are not. Which one for FW's? I
would guess that you don't want intumescent caulk expanding between FW
layers during a fire. Mine is a composite firewall using Rohacell
foam/glass sandwich for structure and Fiberfrax for fire protectionwith an
aluminum sheet over the Fiberfrax for a wipeable surface.

I've not researched their range of products and I'd
have to run them by my power plant guys at RAC. I think
others on the list have made suggestions about this . . .
Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >


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jonlaury(at)impulse.net
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PostPosted: Thu Feb 23, 2006 9:44 am    Post subject: Grab-bar FW penetration Reply with quote

Mickey, Bruce, and Bob,

Thanks all, for your help.
John

do not archive


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