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Fuse or Current Limiter on SeaRey amphib?

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trock07(at)austin.rr.com
Guest

Posted: Mon Feb 16, 2009 9:00 am Post subject: Fuse or Current Limiter on SeaRey amphib?

A friend of mine, who is not on the list and  built a SeaRey amphibian, wanted me to ask the following question.

  

 "Reference Figure Z-15, Ground Systems (Sheet 1/2), Rev K,  04/20/05 - Why no fuse or current limiter at the battery terminal or battery  contactor to protect the 2AWG wire from a dead short along the distance back to  the engine/alternator on a pusher/seaplane?  (In his case that distance is  15'.)



Thanks,

  

 Ken Firestone

   [quote][b]

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mrspudandcompany(at)veriz
Guest

Posted: Mon Feb 16, 2009 10:20 am Post subject: Fuse or Current Limiter on SeaRey amphib?

A friend of mine, who is not on the list and built a SeaRey amphibian, wanted me to ask the following question.  

    

   

    

"Reference Figure Z-15, Ground Systems (Sheet 1/2), Rev K, 04/20/05 - Why no fuse or current limiter at the battery terminal or battery contactor to protect the 2AWG wire from a dead short along the distance back to the engine/alternator on a pusher/seaplane?  (In his case that distance is 15'.)

 

 Thanks,  

    

   

    

Ken Firestone  

  [quote]             This has been discussed on several occasions on this list.  You can search the archives.          It has always been common practice for TC and experimental aircraft to not fuse the Fat Wires.  If reasonable care is taken to install them correctly, then the risk is exceedingly low.                                Roger[b]

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mprather(at)spro.net
Guest

Posted: Mon Feb 16, 2009 10:49 am Post subject: Fuse or Current Limiter on SeaRey amphib?

It's not clear from the description of the SeaRay's architecture, but it

sounds similar to many production (and owner-built) airplanes.  My 182 has

its battery located behind the baggage compartment.  The contactor is

mounted to the battery box, and then there's a long run of heavy gauge

wire to the starter contactor and other buses near the front of the

airplane.



The rationale is that the contactor provides protection for that wire.  If

you smell smoke, you turn off the master - de-energizing the heavy wire. 

It's exceedingly unlikely on any single flight that you'd lose control of

the contactor (not being able to make its output cold), _and_ have a hard

fault on the heavy cable.

Matt-



 	  Quote: 	
		  



 A friend of mine, who is not on the list and built a SeaRey amphibian,

 wanted me to ask the following question.



 "Reference Figure Z-15, Ground Systems (Sheet 1/2), Rev K, 04/20/05 - Why

 no

 fuse or current limiter at the battery terminal or battery contactor to

 protect the 2AWG wire from a dead short along the distance back to the

 engine/alternator on a pusher/seaplane?  (In his case that distance is

 15'.)



 Thanks,



 Ken Firestone





           This has been discussed on several occasions on this list.  You

 can search the archives.

         It has always been common practice for TC and experimental

 aircraft

 to not fuse the Fat Wires.  If reasonable care is taken to install them

 correctly, then the risk is exceedingly low.

                               Roger

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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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