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Single fuse for two fuel guages only

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recapen(at)earthlink.net
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Posted: Wed Apr 01, 2015 10:31 am Post subject: Single fuse for two fuel guages only

I have been doing some rearranging of the wiring and circuit protection in my 6A.



I found my two fuel guages ( Vans IE-VFL-15) wired directly to the starter power input on the key switch (I must have been lazy that day).  The documentation calls for 18AWG wiring for this circuit - but does not specify circuit protection sizing.  I am thinking a 3 amp fuse should allow sufficient current and provide protection for the wiring.



Thoughts please!



Ralph Capen

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gilles.thesee(at)free.fr
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Posted: Thu Apr 02, 2015 1:40 am Post subject: Single fuse for two fuel guages only

Le 01/04/2015 20:30, Ralph E. Capen a écrit :

 	  Quote: 	
		   



 I have been doing some rearranging of the wiring and circuit protection in my 6A.



 I found my two fuel guages ( Vans IE-VFL-15) wired directly to the starter power input on the key switch (I must have been lazy that day).  The documentation calls for 18AWG wiring for this circuit - but does not specify circuit protection sizing.  I am thinking a 3 amp fuse should allow sufficient current and provide protection for the wiring.



Ralph,
	




I'm not sure which wire is 18 AWG in your circuit (starter input ? fuel 

pump wire ?), but this table maybe of some use :

http://contrails.free.fr/elec_fil_section.php



It shows current ratings against wire gauge.



FWIW,

Best regards,

Gilles

http://contrails.free.fr

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nuckolls.bob(at)aeroelect
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Posted: Thu Apr 02, 2015 7:29 am Post subject: Single fuse for two fuel guages only

At 13:30 2015-04-01, you wrote:

 	  Quote: 	
		  

<recapen(at)earthlink.net>



I have been doing some rearranging of the wiring and circuit 

protection in my 6A.



I found my two fuel guages ( Vans IE-VFL-15) wired directly to the 

starter power input on the key switch (I must have been lazy that 

day).  The documentation calls for 18AWG wiring for this circuit - 

but does not specify circuit protection sizing.  I am thinking a 3 

amp fuse should allow sufficient current and provide protection for the wiring.


	


   Your perception is not in error. But why change it?

   It's only a venial sin to power multiple appliances

   from a single protected tap on the bus. The rule of

   thumb calls for evaluating risks to the aircraft or

   occupants should ALL appliances un the group become

   unavailable due to single fault.



   You need to make your own assessment but I suggest

   that your time-of-flight is the back-up predictor

   of fuel quantity. Given the exceedingly rare event

   that ANY protective device will be called upon to

   operate over the lifetime of your airplane, it's

   an exceedingly low-risk condition to leave it wired

   as-is.



   Bob . . .

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recapen(at)earthlink.net
Guest

Posted: Thu Apr 02, 2015 7:51 am Post subject: Single fuse for two fuel guages only

Bob,



As always, the common-sense of your insight returns me to reality!



Yes, time-of-flight and a fuel-flow meter are also available....

in the event of an in-flight failure.



Additionally, if the circuit had failed 'post-previous-flight',

I would not be able to start the engine for an upcoming flight.



Thanks,

Ralph





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