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z13/8 question

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gfr56(at)comcast.net
Guest

Posted: Tue Apr 29, 2008 11:55 am Post subject: z13/8 question

Greetings

  Refering to the Fig Z-13/8 and the wiring of the Endurance bus the  

connection from the Main bus is not protected with a fuse or breaker  

yet the feed from the battery bus is protected with a fuse at the bus  

block and a fuse link between the e-bus alternate feed switch and the  

endurance bus, what is the concept behind this?

Also on the same figure Z-13/8 the connection between the DC Power  

Master Switch and the Main Power Distribution Bus has both a breaker  

and a fuse link, what is concept behind this?

On the same diagram the wire gage for the connection between the Main  

Power Distribution Bus and the Endurance Bus has an * denoting "6  

inches or less" . In my installation the wire run will be longer than  

six inches. Do I need to use a larger gage wire?



Thanks in advance Jerry

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nuckolls.bob(at)cox.net
Guest

Posted: Tue Apr 29, 2008 6:56 pm Post subject: z13/8 question

At 09:54 AM 4/29/2008 -0400, you wrote:



 	  Quote: 	
		  



Greetings

  Refering to the Fig Z-13/8 and the wiring of the Endurance bus the

connection from the Main bus is not protected with a fuse or breaker

yet the feed from the battery bus is protected with a fuse at the bus

block and a fuse link between the e-bus alternate feed switch and the

endurance bus, what is the concept behind this?


	


   Note the (*) symbol on short feeders which if kept

   down to 6" or so, are not generally considered worthy

   of protection. If the main and e-bus fuse blocks are

   co-located with the normal feedpath diode, then protection

   can be dispensed with.



 	  Quote: 	
		  Also on the same figure Z-13/8 the connection between the DC Power

Master Switch and the Main Power Distribution Bus has both a breaker

and a fuse link, what is concept behind this?


	


   The wire from the bus to the alternator field breaker is an

   EXTENSION of the bus . . . which is also a long wire and

   generally worthy of some protection. However, if you use

   crowbar ov protection, the fusing-constant for the upstream

   protection needs to be much longer than the fusing constant

   for the crow-bar breaker. Hence, the fusible link which will

   carry enough current to crow-bar the breaker without

   opening itself.



 	  Quote: 	
		  On the same diagram the wire gage for the connection between the Main

Power Distribution Bus and the Endurance Bus has an * denoting "6

inches or less" . In my installation the wire run will be longer than

six inches. Do I need to use a larger gage wire?


	


   The "six-inch-rule" is a wiring practice adopted by the

   certificated aircraft world for the purpose of deciding

   whether or not fault protection is needed. It's up to

   you if you want to adopt a "12-inch-rule" . . . or whatever.

   It's not a wire size issue.



        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

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gfr56(at)comcast.net
Guest

Posted: Wed Apr 30, 2008 3:56 am Post subject: z13/8 question

Many Thanks

Jerry

---

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