nuckolls.bob(at)aeroelect
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 Posted: Tue Mar 16, 2010 7:44 pm Post subject: Running Big Battery Wire Through Firewall |
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At 07:18 PM 3/15/2010, you wrote:
| Quote: | --> AeroElectric-List message posted by: John Grosse <grosseair(at)comcast.net>
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. |
The legacy wire penetration technique calls for
bringing the wire through a standard grommet which
is then all but totally covered on the engine side
with a two-piece stainless steel shield. See:
http://tinyurl.com/ycx9dv9
This combination of hardware provides for physical
security of the firewall penetration and a good deal
of protection for the grommet against fuel-fed fire.
The final touch is addition of the fire-putty fillet
around the wire and to cover about half the surface
area of the grommet on the engine side. This
adds relative gas-tightness for CO and protection
of the exposed insulation/grommet from fire.
Bob . . . [quote][b]
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