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Switched hot bus

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jason.rouault(at)hp.com
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Posted: Wed Oct 03, 2007 7:39 am Post subject: Switched hot bus

All—  

   

I am currently working on my wiring diagram for my FADEC equipped plane.  I will be using a slightly modified version of the Z-14 diagram.  I found a fellow builder with the same setup as me and got a hold of his wiring diagram.  Attached is a snippet of that diagram.  My question pertains to the guarded switch for FADEC bus #1 (there is a similar setup for FADEC bus #2).  The diagram is showing 4 AWG wire between the battery and guarded switch.  Shouldn’t there be a relay or something here?  

   

Thanks,  

   

Jason  

   

[img]cid:image001.png(at)01C805A0.AE462D00[/img]

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zk-vii(at)rvproject.gen.n
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Posted: Wed Oct 03, 2007 12:04 pm Post subject: Switched hot bus

Hi  Jason,

  

 I'm  guessing that is a typo.  The ECUs require about 7amps if I recall  (although I don't know if that is each or both), HSA / SSA are low level signal  elements - being real generous I don't think more than 15 ish amps will be  required for continuous duty.  Obviously depending on wire length,  something like AWG 14 should be in the ball park.

  

 Now  the question of will the switch handle that current - different  problem...

  

 HTH,

  

 Carl

  

--

ZK-VII - RV 7A QB - finishing? - New Zealand

http://www.rvproject.gen.nz/ 

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