(ET) 6 AWG wire resistance

["Robert" <euclid delhitel net>]

Hi Jack,
The resistance of 6 AWG is 0.3951 ohms per 1000 feet. That equates to a 20" 
length of 6 AWG having the resistance of  0.00149659 and a 19" length having 
the resistance of 0.00142176 ohms. The difference is 0.00007483 ohms. As you 
probably suspect, that's not enough to change much on your amp meter. The 
meter error difference is 19 divided by 20 or 5%.  What probably happened 
was that the connections on the 19" wire, and perhaps the wire itself, went 
up over the years and if you cleaned the connections and replaced the 
original wire with a 19" one you would have very likely gotten the same 
results.

Rob

-----Original Message----- 
From: elec-trak-request cosmos phy tufts edu
Sent: Tuesday, July 07, 2015 10:17 PM
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Subject: Elec-trak Digest, Vol 13, Issue 83

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Today's Topics:

  1. Re:  Power disconnect? Shunt cable? (john j casey)
  2.  shunt (Neil Dennis)
  3. Re:  shunt (jlantonucci comcast net)
  4. Re:  shunt (john j casey)
  5. Re:  shunt (Rob Brockway)
  6.  Controller braking (Rob Brockway)


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

Message: 1
Date: Tue, 07 Jul 2015 13:45:50 -0400
From: john j casey <jjcrmc verizon net>
To: jlantonucci comcast net <jlantonucci comcast net>
Cc: Elec-trak cosmos phy tufts edu
Subject: Re: (ET) Power disconnect? Shunt cable?
Message-ID: <7A0DF8ED-F3F7-44FA-BEAA-2D87F6FA4CC6 verizon net>
Content-Type: text/plain; charset="us-ascii"

Back in the day I had an ammeter problem (running to the red) under very 
light load with my E12.  No loss of power, no unusual battery drain. 
Thought this was a resistance issue but did not where to look except to 
trace the ammeter back to pwr disconnect....at this point my limited 
electronics knowledge took over.  Someone, probably Harold, led me to look 
at the shunt from disconnect to pto contactor.  The HO manual page 4-16 says 
'shunt MS-1 is a 20" length of 6 AWG cable.  Mine was 19" or maybe a bit 
less.  Replaced it with a 20" and ammeter works normally.

Think an oddity in the HO manual is on page 4-16 where it says that cable 
from disconnect to pto is 18.5" of 6AWG.  Someone will have to explain this 
for me.

Cheers, Jack


On Jul 6, 2015, at 10:52 PM, jlantonucci comcast net wrote: