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Z 16 OVP fuselink question (CORRECTION)

 
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nuckolls.bob(at)aeroelect
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PostPosted: Fri May 04, 2018 3:35 pm    Post subject: Z 16 OVP fuselink question (CORRECTION) Reply with quote

The redirection link didn't capture the whole
page . . . here's a 'fix' . . .

Fusible links in vehicles are expected to protect
major feeders of a distribution system against
hard faults . . . generally experienced only during
major disassembly of the vehicle. By hard fault,
were talking many times hundreds to thousands of
amps supplied by a battery . . . not the soft
fault precipitated by a failing appliance.


https://goo.gl/up9oNB



Bob . . .

Bob . . .


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wdaniell.longport(at)gmai
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PostPosted: Tue May 08, 2018 7:02 am    Post subject: Z 16 OVP fuselink question (CORRECTION) Reply with quote

So continuing this theme on z16 can you explain why the alt has a 16 awg fuse link and the buss doesnt?

Thanks
Will
On Fri, May 4, 2018, 18:40 Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

Quote:
The redirection link didn't capture the whole
page . . . here's a 'fix' . . .

  Fusible links in vehicles are expected to protect
  major feeders of a distribution system against
  hard faults . . . generally experienced only during
  major disassembly of the vehicle. By hard fault,
  were talking many times hundreds to thousands of
  amps supplied by a battery . . . not the soft
  fault precipitated by a failing appliance.


https://goo.gl/up9oNB



  Bob . . .

  Bob . . .


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ceengland7(at)gmail.com
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PostPosted: Tue May 08, 2018 8:00 am    Post subject: Z 16 OVP fuselink question (CORRECTION) Reply with quote

The link protects the 12awg from the battery, in case of a hard fault on that line. (Think about faults under the cowl, where you'd never see/smell them in operation.)The feed to the main bus is protected from the battery by the master contactor, with the expectation that the pilot would detect the fault and manually turn off the master. Common FAA-accepted practice in certified planes.
On Tue, May 8, 2018 at 9:52 AM, William Daniell <wdaniell.longport(at)gmail.com (wdaniell.longport(at)gmail.com)> wrote:
Quote:
So continuing this theme on z16 can you explain why the alt has a 16 awg fuse link and the buss doesnt?

Thanks
Will
On Fri, May 4, 2018, 18:40 Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

Quote:
The redirection link didn't capture the whole
page . . . here's a 'fix' . . .

  Fusible links in vehicles are expected to protect
  major feeders of a distribution system against
  hard faults . . . generally experienced only during
  major disassembly of the vehicle. By hard fault,
  were talking many times hundreds to thousands of
  amps supplied by a battery . . . not the soft
  fault precipitated by a failing appliance.


https://goo.gl/up9oNB



  Bob . . .

  Bob . . .



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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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wdaniell.longport(at)gmai
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PostPosted: Tue May 08, 2018 9:14 am    Post subject: Z 16 OVP fuselink question (CORRECTION) Reply with quote

Charlie thanks
So it wouldn't be "wrong" to put a fuselink in the line to the buss?
WIll
William Daniell

LONGPORT
+57 310 295 0744


On Tue, May 8, 2018 at 10:59 AM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
Quote:
The link protects the 12awg from the battery, in case of a hard fault on that line. (Think about faults under the cowl, where you'd never see/smell them in operation.)The feed to the main bus is protected from the battery by the master contactor, with the expectation that the pilot would detect the fault and manually turn off the master. Common FAA-accepted practice in certified planes.
On Tue, May 8, 2018 at 9:52 AM, William Daniell <wdaniell.longport(at)gmail.com (wdaniell.longport(at)gmail.com)> wrote:
Quote:
So continuing this theme on z16 can you explain why the alt has a 16 awg fuse link and the buss doesnt?

Thanks
Will
On Fri, May 4, 2018, 18:40 Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

Quote:
The redirection link didn't capture the whole
page . . . here's a 'fix' . . .

  Fusible links in vehicles are expected to protect
  major feeders of a distribution system against
  hard faults . . . generally experienced only during
  major disassembly of the vehicle. By hard fault,
  were talking many times hundreds to thousands of
  amps supplied by a battery . . . not the soft
  fault precipitated by a failing appliance.


https://goo.gl/up9oNB



  Bob . . .

  Bob . . .




- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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nuckolls.bob(at)aeroelect
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PostPosted: Tue May 08, 2018 12:53 pm    Post subject: Z 16 OVP fuselink question (CORRECTION) Reply with quote

At 12:13 PM 5/8/2018, you wrote:
Quote:
Charlie thanks

So it wouldn't be "wrong" to put a fuselink in the line to the buss?

This is a crew controlled feed from the battery . . .
not expected to be 'hot' on approach-to-the-rocks.

If contact with the ground is un-controlled . . .
then the whole system is likely to be hot . . .
existence of circuit protection probably has
no useful effect on the outcome.




Bob . . .


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