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Z101 main alt wiring

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david(at)carter.net
Guest

Posted: Mon Jun 08, 2020 10:41 am Post subject: Z101 main alt wiring

Bob, 



Tracing the main alt field circuit from the main bus, I see the following wire sizes:

- 16 AWG fusible link

- 12 AWG   wire to 5A breaker & then to power master switch

- 20   AWG  wire to regulator

- 20   AWG  wire to alternator field 

I don't understand the need for the 12 AWG wire feeding the master, which has only 20 AWG coming out of it to the load. 

Thanks,

David 





---

David Carter

david(at)carter.net (david(at)carter.net)

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ceengland7(at)gmail.com
Guest

Posted: Mon Jun 08, 2020 11:26 am Post subject: Z101 main alt wiring

On Mon, Jun 8, 2020 at 1:47 PM David Carter <david(at)carter.net (david(at)carter.net)> wrote:



 	  Quote: 	
		  Bob, 



Tracing the main alt field circuit from the main bus, I see the following wire sizes:

- 16 AWG fusible link

- 12 AWG   wire to 5A breaker & then to power master switch

- 20   AWG  wire to regulator

- 20   AWG  wire to alternator field 

I don't understand the need for the 12 AWG wire feeding the master, which has only 20 AWG coming out of it to the load. 

Thanks,

David 





---

David Carter

david(at)carter.net (david(at)carter.net)



	




Reasonable question; might have been driven by 'off-the-shelf' fusible link size availability. 22awg (minimum reasonable size to work with) link (sleeved with silicone tubing) to 18awg would get the job done. 20awg after the breaker because the breaker protects it.

I've tested the silicone tubing trick on 22awg with a direct short on a 12v tractor battery. The wire vaporizes, leaving a smoky interior lining on the clear silicone tubing, but the tubing contained the 'event'.

Charlie

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david(at)carter.net
Guest

Posted: Wed Jun 10, 2020 6:30 am Post subject: Z101 main alt wiring

Charlie, 



Thanks for the response. What type of silicone tubing do you use for this? 

Regards,

David

---

David Carter

david(at)carter.net (david(at)carter.net)



On Mon, Jun 8, 2020 at 3:30 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:



 	  Quote: 	
		  



On Mon, Jun 8, 2020 at 1:47 PM David Carter <david(at)carter.net (david(at)carter.net)> wrote:



 	  Quote: 	
		  Bob, 



Tracing the main alt field circuit from the main bus, I see the following wire sizes:

- 16 AWG fusible link

- 12 AWG   wire to 5A breaker & then to power master switch

- 20   AWG  wire to regulator

- 20   AWG  wire to alternator field 

I don't understand the need for the 12 AWG wire feeding the master, which has only 20 AWG coming out of it to the load. 

Thanks,

David 





---

David Carter

david(at)carter.net (david(at)carter.net)



	




Reasonable question; might have been driven by 'off-the-shelf' fusible link size availability. 22awg (minimum reasonable size to work with) link (sleeved with silicone tubing) to 18awg would get the job done. 20awg after the breaker because the breaker protects it.

I've tested the silicone tubing trick on 22awg with a direct short on a 12v tractor battery. The wire vaporizes, leaving a smoky interior lining on the clear silicone tubing, but the tubing contained the 'event'.

Charlie

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ceengland7(at)gmail.com
Guest

Posted: Wed Jun 10, 2020 7:17 am Post subject: Z101 main alt wiring

On 6/10/2020 9:26 AM, David Carter       wrote:

     

      	  Quote: 	
		                Charlie,          

         

         Thanks for the response. What type of silicone tubing do           you use for this? 

         

         

         Regards,

         David

                                 ---

               David Carter

               david(at)carter.net (david(at)carter.net)

           

           

         

       

       

                On Mon, Jun 8, 2020 at 3:30 PM           Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:

         

          	  Quote: 	
		                                         

               

             

             

                            On Mon, Jun 8, 2020 at                 1:47 PM David Carter <david(at)carter.net (david(at)carter.net)> wrote:

               

                	  Quote: 	
		                   Bob,                    

                   

                   Tracing the main alt field circuit from the main                     bus, I see the following wire sizes:

                   - 16 AWG fusible link

                   - 12 AWG wire to 5A breaker & then to power                     master switch

                   - 20 AWG                     wire to regulator

                   - 20 AWG                     wire to alternator field 

                   

                   

                   I don't understand the need for the 12 AWG wire                     feeding the master, which has only 20 AWG coming out                     of it to the load. 

                   

                   

                   Thanks,

                   David 

                   

                   

                   

                   

                                                               ---

                         David Carter

                         david(at)carter.net (david(at)carter.net)

                     

                   

                 

               	
               

               

               Reasonable                 question; might have been driven by 'off-the-shelf'                 fusible link size availability. 22awg (minimum                 reasonable size to work with) link (sleeved with                 silicone tubing) to 18awg would get the job done. 20awg                 after the breaker because the breaker protects it.

               

               

               I've                 tested the silicone tubing trick on 22awg with a direct                 short on a 12v tractor battery. The wire vaporizes,                 leaving a smoky interior lining on the clear silicone                 tubing, but the tubing contained the 'event'.

               Charlie

             

           

         	
       

     	
     Hi David,

     

     I don't even remember the source; probably ebay or Amazon. I just     bought clear 'food grade' silicone tubing in an assortment of     diameters. 

     https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313.TR9.TRC1.A0.H0.Xsilicone+tubing+.TRS2&_nkw=silicone+tubing+&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=silicone+tubing+assortment

     

     Charlie

     	          		Virus-free. www.avast.com 		 	 [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Jun 10, 2020 10:07 am Post subject: Z101 main alt wiring

 	  Quote: 	
		   

  Reasonable question; might have been driven by 'off-the-shelf' fusible link size availability. 22awg (minimum reasonable size to work with) link (sleeved with silicone tubing) to 18awg would get the job done. 20awg after the breaker because the breaker protects it.



  I've tested the silicone tubing trick on 22awg with a direct short on a 12v tractor battery. The wire vaporizes, leaving a smoky interior lining on the clear silicone tubing, but the tubing contained the 'event'.

  Charlie 	
 

   Those sizes are still 'in work' . . . 20AWG is the smallest

   commericial-off-the-shelf (COTS) fusible link wire I've found . . .

   and is just fine when extended with 16AWG wire.



   There is no benefit in 'fine tuning' fusible link 

   sizes. I'm thinking we're going to find that the range

   of COTS wires will cover all our needs. I'd guess that

   99.9% of all breakers and fuses installed in vehicles go

   to the scrap yard never having been called upon to do

   their job.



   Fusible links are probably an order of magnitude

   LESS likely to be 'faulted' into service.



   Z101 and 102 suggest some FLW as jumpers between

   contactors/relays . . . I've been pondering these

   choices and have just about concluded that making

   those jumpers short, robust and mechanically

   protected is all that's practical and useful.

   



 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Jun 10, 2020 10:41 am Post subject: Z101 main alt wiring

 	  Quote: 	
		  Hi David,



 I don't even remember the source; probably ebay or Amazon. I just bought clear 'food grade' silicone tubing in an assortment of diameters. 

  https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313.TR9.TRC1.A0.H0.Xsilicone+tubing+.TRS2&_nkw=silicone+tubing+&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=silicone+tubing+assortment 



 Charlie 	


   B&C sells fusible link kits that include

   a silicone over fiberglas sleeving to

   coral the destruction products of what

   ever wire you want to run inside.



  https://tinyurl.com/ya2nzddh



   You can acquire silicon/fiberglas sleeving

   in various sizes/lengths here



  https://tinyurl.com/ybwnk7md



 



 

   Bob . . .

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ceengland7(at)gmail.com
Guest

Posted: Wed Jun 10, 2020 11:58 am Post subject: Z101 main alt wiring

On Wed, Jun 10, 2020 at 1:12 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



[quote]   	  Quote: 	
		   

  Reasonable question; might have been driven by 'off-the-shelf' fusible link size availability. 22awg (minimum reasonable size to work with) link (sleeved with silicone tubing) to 18awg would get the job done. 20awg after the breaker because the breaker protects it.



  I've tested the silicone tubing trick on 22awg with a direct short on a 12v tractor battery. The wire vaporizes, leaving a smoky interior lining on the clear silicone tubing, but the tubing contained the 'event'.

  Charlie 	
 

   Those sizes are still 'in work' . . . 20AWG is the smallest

   commericial-off-the-shelf (COTS) fusible link wire I've found .

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ceengland7(at)gmail.com
Guest

Posted: Wed Jun 10, 2020 12:01 pm Post subject: Z101 main alt wiring

On Wed, Jun 10, 2020 at 2:10 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



 	  Quote: 	
		     	  Quote: 	
		  Hi David,



 I don't even remember the source; probably ebay or Amazon. I just bought clear 'food grade' silicone tubing in an assortment of diameters. 

  https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313.TR9.TRC1.A0.H0.Xsilicone+tubing+.TRS2&_nkw=silicone+tubing+&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=silicone+tubing+assortment 



 Charlie 	


   B&C sells fusible link kits that include

   a silicone over fiberglas sleeving to

   coral the destruction products of what

   ever wire you want to run inside.



  https://tinyurl.com/ya2nzddh



   You can acquire silicon/fiberglas sleeving

   in various sizes/lengths here



  https://tinyurl.com/ybwnk7md



 



 

   Bob . . .

	




I wish I'd been able to find that when I fab'd mine, but it's been a while. Pretty sure it wasn't available back then. Pure silicone is 'good enough', but the Fglas stuff there is no more expensive, so I'll go there for future work. Thanks for the link!

Charlie

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