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2 AWG to 6 AWG Splice

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billhuntersemail(at)gmail
Guest

Posted: Wed Apr 06, 2016 10:09 am Post subject: 2 AWG to 6 AWG Splice

I want to protect my battery (+) 2 AWG conductor cable with a 6 inch length of 6 AWG cable (fusible link).  

I prefer the fusible link approach to the current limiter because of the need to route the cable to a mounting location for the current limiter base and also I don't want to run starting amps through a current limiter.  

How does one splice the two lengths of cable together?  

THANKS  

Bill Hunter

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ARGOLDMAN(at)aol.com
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Posted: Wed Apr 06, 2016 10:20 am Post subject: 2 AWG to 6 AWG Splice

Bill, you can solder the wires together or use some sort of crimp, or crimp  with eyes,  bolted together.

  

 HOWEVER

  

 If the 6AWG fuses, it will produce great amounts of heat, and if  near other wires or structure has the potential of creating lots of grief.

  

 Consider the secondary effects of what would happen if your safety actually  becomes less safe than what it is protecting.

  

 Just a thought

 Rich

  

  In a message dated 4/6/2016 11:10:58 A.M. Pacific Daylight Time,  billhuntersemail(at)gmail.com writes:

  	  Quote: 	
		     

I want to protect my battery (+) 2 AWG conductor cable with a 6    inch length of 6 AWG cable (fusible link).    

I prefer the fusible link approach to the current limiter because    of the need to route the cable to a mounting location for the current limiter    base and also I don't want to run starting amps through a current limiter.     

How does one splice the two lengths of cable together?    

THANKS    

Bill Hunter

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Apr 06, 2016 11:06 am Post subject: 2 AWG to 6 AWG Splice

At 01:07 PM 4/6/2016, you wrote:



  	  Quote: 	
		  I want to protect my battery (+) 2 AWG conductor cable with a 6 inch length of 6 AWG cable (fusible link). 	


   Why do you want to do this? I'm aware of no

   similar action on any of hundreds of thousands

   of TC aircraft.



   In fact, the FARS speak specifically to no

   demonstrated value for adding such protection

   to what is 

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

 Sec. 23.1357   Circuit protective devices.



 (a) Protective devices, such as fuses or circuit breakers, must be

 installed in all electrical circuits other than--

 (1) Main circuits of starter motors used during starting only; and

 (2) Circuits in which no hazard is presented by their omission.

 (b) A protective device for a circuit essential to flight safety may not be

 used to protect any other circuit.

 (c) Each resettable circuit protective device ("trip free" device in which

 the tripping mechanism cannot be overridden by the operating control) must be

 designed so that--

 (1) A manual operation is required to restore service after tripping; and

 (2) If an overload or circuit fault exists, the device will open the

 circuit regardless of the position of the operating control.

 (d) If the ability to reset a circuit breaker or replace a fuse is

 essential to safety in flight, that circuit breaker or fuse must be so

 located and identified that it can be readily reset or replaced in flight.

 (e) For fuses identified as replaceable in flight--

 (1) There must be one spare of each rating or 50 percent spare fuses of

 each rating, whichever is greater; and

 (2) The spare fuse(s) must be readily accessible to any required pilot

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



   Laboratory tests and about 80 years of field

   experience demonstrate that clause (2) prevails

   for all the 'fat' wires in a light aircraft which

   includes battery, starter and high-current bus

   feeders. These wires and the bus structures they

   power are designed and installed to have

   probability of fault failures on the same order as

   prop bolts and wing struts. Hence, no such protection

   is necessary.



 

   Bob . . .

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matronics(at)rtist.nl
Guest

Posted: Wed Apr 06, 2016 11:09 am Post subject: 2 AWG to 6 AWG Splice

Perhaps a bit off-topic, but I am a bit curious. 2 AWG wire.. What type 

of Boeing is this for?? Or are you planning to have the starter and 

battery on opposite sides of the plane and you need a very long run?



May I suggest you look into a small, light-weight starter battery and 

mount that right next to the starter motor? Saves a lot of weight and 

complexity, and the risk of a high current short circuit is a lot lower 

with short connections. I am having good luck with a LiFePO4 battery 

that weighs about 1 kg.



The fusible link of 6 AWG is unlikely protect your battery. It will 

survive more than 650A for 10 seconds, or 4000A for one second. If you 

have a short that fuses 6 AWG then the battery will be suspect at best 

and destroyed at worst. ( 

https://en.wikipedia.org/wiki/American_wire_gauge )



Rob



On 4/6/2016 8:07 PM, William Hunter wrote:

 	  Quote: 	
		  

 I want to protect my battery (+) 2 AWG conductor cable with a 6 inch 

 length of 6 AWG cable (fusible link).



 I prefer the fusible link approach to the current limiter because of 

 the need to route the cable to a mounting location for the current 

 limiter base and also I don't want to run starting amps through a 

 current limiter.



 How does one splice the two lengths of cable together?



 THANKS



 Bill Hunter

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