[AT] Tractor wiring

charlie hill chill8 at cox.net
Fri Nov 19 08:59:01 PST 2004


Thanks Dean.  Good site.  I bookmarked it.

Charlie

----- Original Message ----- 
From: "Dean VP" <deanvp at att.net>
To: "'Antique tractor email discussion group'" 
<at at lists.antique-tractor.com>
Sent: Friday, November 19, 2004 10:36 AM
Subject: RE: [AT] Tractor wiring


> Here is a good table which shows the DC current carrying capacity as a
> function of cable size:
>
> http://www.powerstream.com/Wire_Size.htm
>
>
>
> Dean A. Van Peursem
> Snohomish, WA 98290
>
> I'm a walking storeroom of facts..... I've just lost the key to the
> storeroom door
>
>
> www.deerelegacy.com
>
> http://members.cox.net/classicweb/email.htm
>
>
>
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com
> [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of charlie hill
> Sent: Friday, November 19, 2004 5:26 AM
> To: Antique tractor email discussion group
> Subject: Re: [AT] Tractor wiring
>
> Phil,  a 1 inch pipe will flow 4 times as much water at a given presure 
> than
>
> a 1/2 inch pipe ( if you assume laminar flow).  Does that hold true with
> wire size or is the difference smaller?   Does the cable for a 6 v battery
> need to be twice the diameter of that for a 12 v or ?
>
> Charlie
> ----- Original Message ----- 
> From: "Phil Auten" <pga2 at hot1.net>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Thursday, November 18, 2004 8:30 PM
> Subject: Re: [AT] Tractor wiring
>
>
>> It's the current capacity of the wire that determines the gauge needed.
>> More current, bigger wire. It's that simple.
>> The bigger wire has less resistance so it "drops" less voltage over it's
>> length. A 4 Ga. wire might drop 2V over a 4
>> foot length at the current drawn on a 6V starter. Changing to a 0 Ga. 
>> wire
>
>> will decrease the dropped voltage to less
>> than 1V. More voltage applied to the starter so it can get the full
>> current needed to spin it and the engine up to
>> starting speed.
>> Another analogy is pipe and water flow. A 1/2" pipe can only flow X 
>> amount
>
>> of water at 25 PSI. If you double the
>> size of the pipe, you get more flow at 25 PSI.
>>
>> Phil
>>
>> At 08:51 PM 11/17/04, you wrote:
>>>Here is my question on this subject.
>>>
>>>Why are battery cables for 6 volt systems heavier than those for 12 volt
>>>applications?   Assuming both are powering a starter to turn a similar
>>>size engine (similar load), why would the 6 volt cable need to be bigger.
>>>It flows more amps but less voltage and should flow roughly the same
>>>wattage in both applications.
>>>
>>>Charlie
>>
>>
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