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AeroElectric-List: Insulated ground cables?

 
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rnjcurtis(at)charter.net
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PostPosted: Sat Jan 17, 2015 7:40 am    Post subject: AeroElectric-List: Insulated ground cables? Reply with quote

Many of the fuel lines are grounded to the airframe by short, thick ground cables.
Here's a link that shows a typical ground strap.  This isn't one of the planes I'm working on, just a convenient snapshot off the internet:
http://www.csobeech.com/images/Baron-FuelSelectorCable.jpg

The question is, why bother to install a ground strap that terminates to an insulated adel clamp?
About all we can figure is that -if- they're for lightning protection, the rubber won't offer much relative resistance.
The practice is consistent across several airplanes.  Are we missing something?  It's so counterintuitive that there must be a good reason.
--Dave
[quote]I believe that you will find, if you remove and inspect the Adel clamp, there is a thin metal ribbon woven through the rubber in such a way that it makes contact with the fuel line and the metal structure of the clamp.  This will, in fact ground the fuel line.
Roger

[b]

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