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Z-19 E Bus feeder questions - Fuse selection?

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nuckolls.bob(at)cox.net
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Posted: Wed Oct 10, 2007 5:29 pm Post subject: Z-19 E Bus feeder questions - Fuse selection?

At 09:56 AM 10/10/2007 -0700, you wrote:



 	  Quote: 	
		  



In looking at the Z-19 diagram I see the Endurance Bus (EB) is potentially 

fed from the Main Power Distribution Bus (with a 7 amp fuse) or

the Main Battery Bus (with a 10 amp fuse). The EB contains 26 amps worth 

of fused instruments and corresponding load.



1. Why are the fuses feeding the EB so much smaller than the potential 

load of the EB? Would use exceeding the

7 amp and 10 amp fuses cause a blown fuse and loss of power to all of the EB?



2. Why are the fuse sizes different between the Main Power bus and Main 

Battery bus, when feeding the EB?



Thanks for any clarifications,


	


   If your e-bus loads are that large, then it's not

   an endurance bus. The point of the e-bus is to

   drop to the aboslute minimum loads on battery(ies)

   in the en route phase of flight for the purpose of

   keeping the alternator failure in the maintenance

   event, not emergency event (or even tense) category.



   Effective use of the e-bus requires you have . . .



   (a) a calculated (measure all the real loads) and



   (b) verified ability to run those loads for whatever

   value of duration you adopt as your design goal. I like

   to use duration of fuel aboard. Verification calls

   for periodic cap checks or periodic early replacement

   such that the design goals are maintained.



   The Z-figures are ARCHITECTURE drawings crafted to

   offer solutions to a variety of design goals for

   a variety of aircraft. The sizes of things (wire sizes,

   fuses, etc) and numbers of things and where those

   things get powered from are up to the individual

   builder to select and adjust as needed.



   You size the fuses and wires in accordance with

   the levels of operating loads and protection dictated

   by the final design. If your e-bus loads are

   truly that big, then you'll need some really

   big batteries to provide significant performance

   under the e-bus operating philosophy.



   Suggest you shoot for an e-bus load on the order

   of 5A or less. Some of my builders are under

   3A.



   Bob . . .



        ----------------------------------------

        ( "Problems are the price of progress. )

        ( Don't bring me anything but trouble. )

        ( Good news weakens me."               )

        (              -Charles F. Kettering-  )

        ----------------------------------------

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mikefapex

Joined: 05 Jul 2007
Posts: 70
Location: Colorado

Posted: Thu Oct 11, 2007 6:24 am Post subject: Re: Z-19 E Bus feeder questions - Fuse selection?

Bob,



Thank you for clarifying the Z-19 architecture drawing for this e-bus question. I do not have all that stuff hanging off my e-bus but was thinking that maybe somebody did. And that was the reason for their appearance in the diagram. All those components seem reasonable to have, but like you said, maybe not all on the e-bus. 



I think I have the right mix on my own e-bus, I wanted to understand the Z-19 diagram to a better degree, and the different fuse sizes to potential e-bus loads led me around the bend.



Thanks,



Mike

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