Re: Running Big Battery Wire Through Firewall


Subject:    Re: Running Big Battery Wire Through Firewall
From:    John Grosse (grosseair@comcast.net)
Date:    Tue Mar 16 - 7:51 AM
I'm sorry, but I'm not understanding something. The devices below look 
more secure to me than a wire through a hole in the firewall filled with 
fire putty. I can see that the bolt could conduct heat from a fire, but 
then so could a wire. The concept with these devices seems the same to 
me as a bulkhead fitting for hydraulic lines which is apparently okay. 
So could someone explain why these electrical fittings are incompatible 
with firewall security.

Thanks.

John Grosse

Robert L. Nuckolls, III wrote:
> At 08:37 AM 3/10/2010, you wrote:
>>
>> David,
>>
>> I can tell you there is more than one way to skin a cat, but if you look
>> at one of the gazillion Piper Cherokees out there, the cable runs from
>> under the back seat along the left panel through the generally dry
>> rotted grand-daddy grommet to the contactor mounted on the firewall.
>> Size does matter but for 2 or 4 GA that won't make a difference. Good
>> enough for Piper...
>
>    I don't think I've yet seen a commercial-off-the-shelf firewall
>    feedthru where the insulating material would have stood off
>    Jack Thermin's "puff the magic dragon" test. Electrically
>    and mechanically, these critters function as advertised.
>    The price is low and they seem adequately robust.
>
>    However, if one subscribes to the notion of protecting
>    firewall integrity with processes like . . .
>
> http://www.aeroelectric.com/articles/Firewall_Penetration/firewall.html
>
>    then devices like . . .
>
> Emacs!
>
>
> and . . .
>
> Emacs!
>     Are incompatible with the design goal cited in the
>     article. So if your design goals include attention
>     to details of fire-wall integrity, then perhaps
>     single fat-wires are best brought through grommets
>     with fire-shields and application of fire-putty
>     per Tony B's writings.
>
>     Bob . . .




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