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Diagram Z-13

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crabandy(at)yahoo.com
Guest

Posted: Thu Feb 14, 2013 11:14 am Post subject: Diagram Z-13

Reference Diagram Z-13 from the main power distribution bus the alt field wire shows a fusable link followed by a circuit breaker then the switch. Is it an option either fusable link or circuit breaker?

Could you also just use a fuse in the fuse holder, it just introduces "gremlins" the fuse holder could be loose or corrode ?

Thanks,

Andy

Sent from my iPhone

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nuckolls.bob(at)aeroelect
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Posted: Thu Feb 14, 2013 11:26 am Post subject: Diagram Z-13

At 01:12 PM 2/14/2013, you wrote:

 	  Quote: 	
		  

Reference Diagram Z-13 from the main power distribution bus the alt 

field wire shows a fusable link followed by a circuit breaker then 

the switch. Is it an option either fusable link or circuit breaker?


	


   Are your busses tapped with circuit breakers or fuses?



   z-13 illustrates the use of fuse blocks. The crowbar

   ovm systems require a panel mounted breaker. Hence, the

   BUS is EXTENDED from the fuse block to the breaker;

   the extension is protected with a very robust fuse

   or 'fusible link'.



   If you're building with breakers, then the fusible

   link is not necessary.



 	  Quote: 	
		  Could you also just use a fuse in the fuse holder, it just 

introduces "gremlins" the fuse holder could be loose or corrode


	


   Look up Fusible Link on the website. This

   is a special kind of fuse used in limited

   and unique situations.

   Bob . . .

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crabandy(at)yahoo.com
Guest

Posted: Thu Feb 14, 2013 12:33 pm Post subject: Diagram Z-13

I am wired with the auto fuse blocks, i understand the fuseable link concept, i think. I'm having trouble understanding why the crowbar OVM requires the circuit breaker instead of using an auto fuse.

Thanks again for all your shared info,

Andy

Sent from my iPhone

On Feb 14, 2013, at 1:26 PM, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:

 	  Quote: 	

 At 01:12 PM 2/14/2013, you wrote:

> 

> 

> 

> Reference Diagram Z-13 from the main power distribution bus the alt field wire shows a fusable link followed by a circuit breaker then the switch. Is it an option either fusable link or circuit breaker?

  Are your busses tapped with circuit breakers or fuses?

  z-13 illustrates the use of fuse blocks. The crowbar

  ovm systems require a panel mounted breaker. Hence, the

  BUS is EXTENDED from the fuse block to the breaker;

  the extension is protected with a very robust fuse

  or 'fusible link'.

  If you're building with breakers, then the fusible

  link is not necessary.

> Could you also just use a fuse in the fuse holder, it just introduces "gremlins" the fuse holder could be loose or corrode

  Look up Fusible Link on the website. This

  is a special kind of fuse used in limited

  and unique situations.

  Bob . . .

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longg(at)pjm.com
Guest

Posted: Thu Feb 14, 2013 1:02 pm Post subject: Diagram Z-13

Andy,



With CBs and Airplanes you get 1 chance to reset. This gives you that 1 chance. If it pops again, never reset it until you are on the ground. Last time I tried to change a fuse while flying my wife kept yelling something like, "we gonna die" 



The fuse-able link allows that link (the smaller wire) to break the circuit if the main wire ever gets hot enough to burn back to the bus. I tested that 1 on the ground. It works  The link wire needs to be large enough to handle the expected load + 20% or so.



My rationale for fuses is pretty simple. If you need it to land safely, don't use a fuse. In my bird there is very little that I can claim to be absolutely necessary for landing (without getting hurt). Flaps are 1 of them. 



I'll never have to worry about getting published in IEEE, but I've discovered what works practically over time. The two are often different.

Glenn



--

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crabandy(at)yahoo.com
Guest

Posted: Thu Feb 14, 2013 2:33 pm Post subject: Diagram Z-13

Thanks for the replies. It is referenced several places in the connection that the crowbar over voltage needs a circuit breaker. Does the crowbar over voltage not work with a fuse? Why?

Thanks again!

Andy



Sent from my iPhone



On Feb 14, 2013, at 3:01 PM, <longg(at)pjm.com> wrote:



[quote] 

 

 Andy,

 

 With CBs and Airplanes you get 1 chance to reset. This gives you that 1 chance. If it pops again, never reset it until you are on the ground. Last time I tried to change a fuse while flying my wife kept yelling something like, "we gonna die" 

 

 The fuse-able link allows that link (the smaller wire) to break the circuit if the main wire ever gets hot enough to burn back to the bus. I tested that 1 on the ground. It works  The link wire needs to be large enough to handle the expected load + 20% or so.

 

 My rationale for fuses is pretty simple. If you need it to land safely, don't use a fuse. In my bird there is very little that I can claim to be absolutely necessary for landing (without getting hurt). Flaps are 1 of them. 

 

 I'll never have to worry about getting published in IEEE, but I've discovered what works practically over time. The two are often different.

 

 

 Glenn

 

 --

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Feb 14, 2013 4:00 pm Post subject: Diagram Z-13

At 02:31 PM 2/14/2013, you wrote:

 	  Quote: 	
		  



I am wired with the auto fuse blocks, i understand the fuseable link 

concept, i think. I'm having trouble understanding why the crowbar 

OVM requires the circuit breaker instead of using an auto fuse.


	


   Because it MAY nuisance trip and you want to

   be able to reset it from the pilot's seat.



   Bob . . .

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crabandy(at)yahoo.com
Guest

Posted: Thu Feb 14, 2013 6:24 pm Post subject: Diagram Z-13

Roger! 

Thanks again,

Andy



Sent from my iPhone



On Feb 14, 2013, at 6:00 PM, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:



 	  Quote: 	
		   

 

 At 02:31 PM 2/14/2013, you wrote:

> 

> 

> I am wired with the auto fuse blocks, i understand the fuseable link concept, i think. I'm having trouble understanding why the crowbar OVM requires the circuit breaker instead of using an auto fuse.

 

  Because it MAY nuisance trip and you want to

  be able to reset it from the pilot's seat.

 

 

 

  Bob . . .

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